Acaricides

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Manoel G. C. Gondim - One of the best experts on this subject based on the ideXlab platform.

  • Acaricide-Mediated Colonization of Mite-Infested Coconuts by the Predatory Phytoseiid Neoseiulus baraki (Acari: Phytoseiidae)
    Journal of Economic Entomology, 2018
    Co-Authors: Vaneska Barbosa Monteiro, D. B. Lima, J. W. S. Melo, R N C Guedes, Manoel G. C. Gondim
    Abstract:

    Walking is important to dispersal on plants and colonization of new plants by predatory mites, and this activity is potentially affected by the presence of Acaricides. This possibility was investigated in coconut fruits infested with the coconut mite, Aceria guerreronis Keifer (Acari: Eriophyidae), where colonization by the predator Neoseiulus baraki (Athias-Henriot) (Acari: Phytoseiidae) was monitored. The following Acaricides were evaluated for influence on the process of colonization by the predatory mite: abamectin, azadirachtin, and fenpyroximate. Water-treated fruits were used for comparison. Experiments were conducted with and without freedom of choice on coconut fruits with the release and recapture of females of N. baraki marked with fluorescent ink. A confinement experiment was also carried out on coconut bunch rachis sprayed or not sprayed with the Acaricides. The predatory mite N. baraki avoided contact with acaricide-contaminated areas. After the predators were released on the fruits or bunch rachis, larger numbers were recaptured under the bracts than on the surface of the fruits. The number of predators recaptured in all experiments was lower in the treatments with Acaricides than in the control. Among the Acaricides tested, azadirachtin least affected N. baraki colonization. Therefore, the presence of the tested Acaricides indeed interferes with N. baraki dispersal within plants and the coconut fruit colonization.

  • Toxicity of Acaricides to and the behavioural response of Steneotarsonemus concavuscutum (Acari: Tarsonemidae)
    Crop Protection, 2018
    Co-Authors: Girleide Vieira França, D. B. Lima, Vaneska Barbosa Monteiro, Manoel G. C. Gondim
    Abstract:

    Abstract Steneotarsonemus concavuscutum Lofego and Gondim Jr. causes chlorosis, necrosis, deformation, resinosis and death of coconut fruit (Cocos nucifera L.). These types of damage are commonly interpreted to result from Aceria guerreronis Keifer. The control of mites in coconut fruits is carried out primarily by acaricide applications. However, no records exist on the effectiveness of Acaricides for S. concavuscutum control. Therefore, this study aimed to evaluate the toxicity of Acaricides registered for the control of A. guerreronis on S. concavuscutum, in addition to analysing the walking behaviour of tarsonemid mites when exposed to the products. The behaviour of mites exposed to Acaricides was studied with a video-tracking system in choice and no-choice arenas treated with Acaricides. The LC50 estimate for abamectin and fenpyroximate was 1.1 mg/L and 2757 mg/L, respectively. Azadirachtin, spirodiclofen and hexythiazox caused mortality of up to 25%. Only exposure to abamectin reduced the number of mites that reached the perianth and remained live, but no difference was observed in the number of eggs found at this site. No acaricide showed an ovicidal or sterilizing effect on the females. The total distance walked and the walking velocity were higher when S. concavuscutum was exposed to azadirachtin and lower when exposed to abamectin. All Acaricides irritated S. concavuscutum; however, repellence was observed in only 5% of the tested population for abamectin and azadirachtin. Among the products recommended for the control of A. guerreronis, only abamectin showed potential in controlling S. concavuscutum.

  • Population-level effects of abamectin, azadirachtin and fenpyroximate on the predatory mite Neoseiulus baraki
    Experimental and Applied Acarology, 2016
    Co-Authors: D. B. Lima, J. W. S. Melo, Manoel G. C. Gondim, Raul N. C. Guedes, José E. M. Oliveira
    Abstract:

    The coconut production system, in which the coconut mite Aceria guerreronis is considered a key pest, provides an interesting model for integration of biological and chemical control. In Brazil, the most promising biological control agent for the coconut mite is the phytoseiid predator Neoseiulus baraki . However, Acaricides are widely used to control the coconut mite, although they frequently produce unsatisfactory results. In this study, we evaluated the simultaneous direct effect of dry residue contact and contaminated prey ingestion of the main Acaricides used on coconut palms (i.e., abamectin, azadirachtin and fenpyroximate) on life-history traits of N. baraki and their offspring. These Acaricides are registered, recommended and widely used against A. guerreronis in Brazil, and they were tested at their label rates. The offspring of the exposed predators was also evaluated by estimating the instantaneous rate of population increase ( r _ i ). Abamectin compromised female performance, whereas fenpyroximate did not affect the exposed females (F0). Nonetheless, fenpyroximate strongly compromised the offspring (F1) net reproductive rate (R_0), intrinsic rate of population growth ( r _ i ), and doubling time (DT). In contrast, fenpyroximate did not have such effects on the 2nd generation (F2) of predators with acaricide-exposed grandparents. Azadirachtin did not affect the predators, suggesting that this acaricide can be used in association with biological control by this predatory species. In contrast, the use of abamectin and fenpyroximate is likely to lead to adverse consequences in the biological control of A. guerreronis using N. baraki .

  • Acaricide-impaired functional predation response of the phytoseiid mite Neoseiulus baraki to the coconut mite Aceria guerreronis
    Ecotoxicology, 2015
    Co-Authors: D. B. Lima, J. W. S. Melo, J. E. M. Oliveira, Manoel G. C. Gondim, R N C Guedes, Angelo Pallini
    Abstract:

    Acaricides may interfere with a myriad of interactions among arthropods, particularly predator–prey interactions. The coconut mite, Aceria guerreronis Keifer (Acari: Eriophyidae), and its phytoseiid predator, Neoseiulus baraki (Athias-Henriot) (Acari: Phytoseiidae), provide an opportunity to explore such interference because the former is a key coconut pest species that requires both predation and acaricide application for its management. The objective of the present study was to assess the effect of the Acaricides abamectin, azadirachtin and fenpyroximate on the functional response of N. baraki to A. guerreronis densities. The following prey densities were tested: 5, 10, 20, 40 and 80 preys. The type of functional response and prey handling time ( Th ) were not altered by the Acaricides. However, the attack rate ( a′ ) was modified by abamectin and fenpyroximate, and the consumption peak was reduced by abamectin. All of the Acaricides allowed for the maintenance of the predator in the field, but exposure to abamectin and fenpyroximate compromised prey consumption.

  • resistance in field populations of tetranychus urticae to Acaricides and characterization of the inheritance of abamectin resistance
    Crop Protection, 2015
    Co-Authors: Cecilia B S Ferreira, Fernanda Helena Nascimento De Andrade, Herbert Alvaro A Siqueira, Agna R S Rodrigues, Manoel G. C. Gondim
    Abstract:

    Abstract Tetranychus urticae Koch (Acari: Tetranychidae) is one of the most important mite pests in the world. This mite is mainly controlled with synthetic Acaricides, and abamectin is one of the most widely used ones. However, control failures have occurred in the field that may be associated with the development of acaricide resistance. Studies were carried out to evaluate resistance to abamectin in four T. urticae populations using dipping test. Also, cross-resistance was assessed to nine Acaricides and the genetic basis to the abamectin resistance was determined. Reciprocal crosses between resistant and susceptible populations were carried out to test the inheritance of resistance. Populations from Bonito and Brejao (state of Pernambuco, Brazil) were highly resistant to abamectin and to other Acaricides tested, including METI group. Cross-resistance observed between abamectin and milbemectin was likely due to similar modes of action because milbemectin was not used in the field. The inheritance findings of this work indicate that resistance to abamectin in Bonito and Brejao populations was autosomal, incomplete recessive and polyfactorial.

Angelo Pallini - One of the best experts on this subject based on the ideXlab platform.

  • Acaricide-impaired functional predation response of the phytoseiid mite Neoseiulus baraki to the coconut mite Aceria guerreronis
    Ecotoxicology, 2015
    Co-Authors: D. B. Lima, J. W. S. Melo, J. E. M. Oliveira, Manoel G. C. Gondim, R N C Guedes, Angelo Pallini
    Abstract:

    Acaricides may interfere with a myriad of interactions among arthropods, particularly predator–prey interactions. The coconut mite, Aceria guerreronis Keifer (Acari: Eriophyidae), and its phytoseiid predator, Neoseiulus baraki (Athias-Henriot) (Acari: Phytoseiidae), provide an opportunity to explore such interference because the former is a key coconut pest species that requires both predation and acaricide application for its management. The objective of the present study was to assess the effect of the Acaricides abamectin, azadirachtin and fenpyroximate on the functional response of N. baraki to A. guerreronis densities. The following prey densities were tested: 5, 10, 20, 40 and 80 preys. The type of functional response and prey handling time ( Th ) were not altered by the Acaricides. However, the attack rate ( a′ ) was modified by abamectin and fenpyroximate, and the consumption peak was reduced by abamectin. All of the Acaricides allowed for the maintenance of the predator in the field, but exposure to abamectin and fenpyroximate compromised prey consumption.

  • Fitness costs associated with low-level dimethoate resistance in Phytoseiulus macropilis
    Experimental and Applied Acarology, 2013
    Co-Authors: D. D. M. Rezende, M. A. M. Fadini, H. G. Oliveira, C. M. Oliveira, J. W. S. Melo, R. N. C. Guedes, Angelo Pallini
    Abstract:

    Phytoseiulus macropilis Banks (Acari: Phytoseiidae) is an effective predator of tetranychid mites, but there are no data on its response to pesticides. We investigated the resistance of the predatory mite P. macropilis to the Acaricides abamectin and dimethoate, and we examined the fitness costs associated with resistance. Two populations were tested: one from conventional cultivation and another from an area not commercially exploited. After the application of Acaricides to the predator, we determined the lethal effects of the Acaricides, the instantaneous rate of population increase ( r _ i ), the predation on Tetranychus urticae Koch (Acari: Tetranychidae) and its ability to locate prey in an olfactometer. P. macropilis exhibited resistance to dimethoate only. The low level of resistance (9.4x) of the predator did not affect their ability to locate prey. However, the dimethoate resistant population was not as effective in contatining prey population when in lower density and exhibited a more pronounced decrease of r _ i in the presence of this acaricide, due to the reduced oviposition of the predator, a likely consequence of the different genetic background of this population.

  • Survival and behavioural response to Acaricides of the coconut mite predator Neoseiulus baraki.
    Experimental and Applied Acarology, 2012
    Co-Authors: D. B. Lima, J. W. S. Melo, Angelo Pallini, R N C Guedes, Herbert A.a. Siqueira, Manoel G. C. Gondim
    Abstract:

    The coconut mite, Aceria guerreronis Keifer, is a major pest of coconut palm in the world. The control of this pest species is done through acaricide applications at short time intervals. However, the predators of this pest may also be affected by Acaricides. Among the predators of A. guerreronis, Neoseiulus baraki (Athias-Henriot) has potential for biological control. The objective of this study was to assess the effect of Acaricides on the survival and behavior of N. baraki. The survivorship of N. baraki was recorded in surface-impregnated arenas. Choice and no-choice behavioral bioassays were carried out using a video tracking system to assess the walking behavior of the predator under acaricide exposure. Although all Acaricides negatively affected the survival of N. baraki, chlorfenapyr and azadirachtin caused lower effect than the other Acaricides. No significant differences in walking behavior were observed under exposure to fenpyroximate, chlorfenapyr and chlorpyrifos on fully-contaminated arenas. Azadirachtin and chlorpyrifos caused repellence. Irritability was observed for all Acaricides, except for abamectin. Chlorfenapyr was the most suitable product for managing the coconut mite because of its low effect on survival and behavior of N. baraki.

Martín Javier Eguaras - One of the best experts on this subject based on the ideXlab platform.

  • Sublethal effects of Acaricides and Nosema ceranae infection on immune related gene expression in honeybees
    Veterinary Research, 2016
    Co-Authors: Paula Melisa Garrido, Martín Javier Eguaras, Martín Pablo Porrini, Karina Antúnez, Belén Branchiccela, Giselle María Astrid Martínez-noël, Pablo Zunino, Graciela Salerno, Elena Ieno
    Abstract:

    AbstractNosema ceranae is an obligate intracellular parasite and the etiologic agent of Nosemosis that affects honeybees. Beside the stress caused by this pathogen, honeybee colonies are exposed to pesticides under beekeeper intervention, such as Acaricides to control Varroa mites. These compounds can accumulate at high concentrations in apicultural matrices. In this work, the effects of parasitosis/acaricide on genes involved in honeybee immunity and survival were evaluated. Nurse bees were infected with N. ceranae and/or were chronically treated with sublethal doses of coumaphos or tau-fluvalinate, the two most abundant pesticides recorded in productive hives. Our results demonstrate the following: (1) honeybee survival was not affected by any of the treatments; (2) parasite development was not altered by acaricide treatments; (3) coumaphos exposure decreased lysozyme expression; (4) N. ceranae reduced levels of vitellogenin transcripts independently of the presence of Acaricides. However, combined effects among stressors on imagoes were not recorded. Sublethal doses of Acaricides and their interaction with other ubiquitous parasites in colonies, extending the experimental time, are of particular interest in further research work.

  • the presence of synthetic Acaricides in beeswax and its influence on the development of resistance in varroa destructor
    Journal of Apicultural Research, 2015
    Co-Authors: Sandra Karina Medici, Matias Maggi, Sergio Roberto Ruffinengo, Edgardo G Sarlo, Juan M Marioli, Martín Javier Eguaras
    Abstract:

    After honey production, beeswax ranks second as regards hive product used in industry and cosmetics. In Argentina, the use of commercial wax adulterated with paraffin and other olefins for comb foundation is a common practice. As regards beehives, the progressive accumulation of synthetic Acaricides in wax has caused adverse effects on bees, mainly on individuals at different stages of development. Another issue associated with the use of synthetic Acaricides is the phenomenon of resistance. This study aimed to determine the presence of adulterants and acaricide residues in commercial wax used in Argentina. Furthermore, the relationship between coumaphos content in wax and the development of mite resistance reported in recent years in Argentina was investigated. The results demonstrate that paraffin is the most common contaminant substance present in recycled beeswax and commercial wax used for comb foundation in the country. Coumaphos was also found to be the most common acaricide present in wax; 87% in ...

  • immune related gene expression in nurse honey bees apis mellifera exposed to synthetic Acaricides
    Journal of Insect Physiology, 2013
    Co-Authors: Paula Melisa Garrido, Martín Pablo Porrini, Karina Antúnez, Pablo Zunino, Mariana L Martin, Martín Javier Eguaras
    Abstract:

    The mite Varroa destructor is an ectoparasite affecting honey bees worldwide. Synthetic Acaricides have been among the principal tools available to beekeepers for its control, although several studies have shown its negative effects on honey bee physiology. Recent research suggests that those molecules strongly impact on immune signaling cascades and cellular immunity. In the present work, LC50 in six-day-old bees were determined for the following Acaricides: tau-fluvalinate, flumethrin, amitraz and coumaphos. According to this obtained value, a group of individuals was treated with each acaricide and then processed for qPCR analysis. Transcript levels for genes encoding antimicrobial peptides and immune-related proteins were assessed. Flumethrin increased the expression of hymenoptaecin when comparing treated and control bees. Significant differences were recorded between coumaphos and flumethrin treatments, while the first one reduced the expression of hymenoptaecin and abaecin, the last one up-regulated their expressions. No significant statistically changes were recorded in the expression levels of vitellogenin, lysozyme or glucose dehydrogenase among bees treated with Acaricides and control bees. This work constitutes the first report, under laboratory conditions, about induction of immune related genes in response to synthetic miticides.

  • susceptibility of varroa destructor acari varroidae to synthetic Acaricides in uruguay varroa mites potential to develop acaricide resistance
    Parasitology Research, 2011
    Co-Authors: Matias Maggi, Sergio Roberto Ruffinengo, Yamandu Mendoza, Pilar Ojeda, Gustavo Ramallo, Iganazio Floris, Martín Javier Eguaras
    Abstract:

    The purpose of this study was to estimate the acaricide susceptibility of Varroa destructor populations from Uruguay, which had never been exposed to synthetic Acaricides. It was also to determine whether acaricide resistance to coumaphos occurred in apiaries in which acaricide rotation had been applied. Bioassays with Acaricides against mite populations that had never been exposed to synthetic Acaricides were performed, also against mite populations in which control failures with coumaphos had been reported. Additionally, coumaphos’ effectiveness in honeybee colonies was experimentally tested. The lethal concentration that kills 50% of the exposed animals (LC50) for susceptible mite populations amounted to 0.15 μg/Petri dish for coumaphos and to less than 0.3 μg/Petri dish for the other Acaricides. Coumaphos LC50 was above 40 μg/Petri dish for resistant mites. The effectiveness of coumaphos in honeybee colonies parasitized by V. destructor ranged from 17.6% to 93.9%. LC50 for mite populations susceptible to the most commonly applied miticides was determined, and the first case of coumaphos resistance recorded in Uruguay was established.

  • resistance phenomena to amitraz from populations of the ectoparasitic mite varroa destructor of argentina
    Parasitology Research, 2010
    Co-Authors: Matias Maggi, Pedro Negri, Sergio Roberto Ruffinengo, Martín Javier Eguaras
    Abstract:

    In Argentina, Varroa destructor resistance to coumaphos has been previously reported. However, the status of mite susceptibility to other hard Acaricides is still unknown. At present, high infestation levels of V. destructor are being detected in colonies of Apis mellifera after treatment with amitraz. The aim of the present study was to determine the LC50 of amitraz in V. destructor from three apiaries with high mite density after treatment with the acaricide. The LC50 values were 3.9, 3.5, and 3.7 μg/Petri dish for mites from three different apiaries. Significant LC50 differences were detected between resistant and susceptible mites. LC50 increased 35–39-fold when compared to the corresponding baseline, suggesting the development of resistance. These results are the first report of resistance to amitraz in V. destructor in Argentina and extend the knowledge according to the status of Acaricides resistance in the country.

D. B. Lima - One of the best experts on this subject based on the ideXlab platform.

  • Acaricide-Mediated Colonization of Mite-Infested Coconuts by the Predatory Phytoseiid Neoseiulus baraki (Acari: Phytoseiidae)
    Journal of Economic Entomology, 2018
    Co-Authors: Vaneska Barbosa Monteiro, D. B. Lima, J. W. S. Melo, R N C Guedes, Manoel G. C. Gondim
    Abstract:

    Walking is important to dispersal on plants and colonization of new plants by predatory mites, and this activity is potentially affected by the presence of Acaricides. This possibility was investigated in coconut fruits infested with the coconut mite, Aceria guerreronis Keifer (Acari: Eriophyidae), where colonization by the predator Neoseiulus baraki (Athias-Henriot) (Acari: Phytoseiidae) was monitored. The following Acaricides were evaluated for influence on the process of colonization by the predatory mite: abamectin, azadirachtin, and fenpyroximate. Water-treated fruits were used for comparison. Experiments were conducted with and without freedom of choice on coconut fruits with the release and recapture of females of N. baraki marked with fluorescent ink. A confinement experiment was also carried out on coconut bunch rachis sprayed or not sprayed with the Acaricides. The predatory mite N. baraki avoided contact with acaricide-contaminated areas. After the predators were released on the fruits or bunch rachis, larger numbers were recaptured under the bracts than on the surface of the fruits. The number of predators recaptured in all experiments was lower in the treatments with Acaricides than in the control. Among the Acaricides tested, azadirachtin least affected N. baraki colonization. Therefore, the presence of the tested Acaricides indeed interferes with N. baraki dispersal within plants and the coconut fruit colonization.

  • Toxicity of Acaricides to and the behavioural response of Steneotarsonemus concavuscutum (Acari: Tarsonemidae)
    Crop Protection, 2018
    Co-Authors: Girleide Vieira França, D. B. Lima, Vaneska Barbosa Monteiro, Manoel G. C. Gondim
    Abstract:

    Abstract Steneotarsonemus concavuscutum Lofego and Gondim Jr. causes chlorosis, necrosis, deformation, resinosis and death of coconut fruit (Cocos nucifera L.). These types of damage are commonly interpreted to result from Aceria guerreronis Keifer. The control of mites in coconut fruits is carried out primarily by acaricide applications. However, no records exist on the effectiveness of Acaricides for S. concavuscutum control. Therefore, this study aimed to evaluate the toxicity of Acaricides registered for the control of A. guerreronis on S. concavuscutum, in addition to analysing the walking behaviour of tarsonemid mites when exposed to the products. The behaviour of mites exposed to Acaricides was studied with a video-tracking system in choice and no-choice arenas treated with Acaricides. The LC50 estimate for abamectin and fenpyroximate was 1.1 mg/L and 2757 mg/L, respectively. Azadirachtin, spirodiclofen and hexythiazox caused mortality of up to 25%. Only exposure to abamectin reduced the number of mites that reached the perianth and remained live, but no difference was observed in the number of eggs found at this site. No acaricide showed an ovicidal or sterilizing effect on the females. The total distance walked and the walking velocity were higher when S. concavuscutum was exposed to azadirachtin and lower when exposed to abamectin. All Acaricides irritated S. concavuscutum; however, repellence was observed in only 5% of the tested population for abamectin and azadirachtin. Among the products recommended for the control of A. guerreronis, only abamectin showed potential in controlling S. concavuscutum.

  • Population-level effects of abamectin, azadirachtin and fenpyroximate on the predatory mite Neoseiulus baraki
    Experimental and Applied Acarology, 2016
    Co-Authors: D. B. Lima, J. W. S. Melo, Manoel G. C. Gondim, Raul N. C. Guedes, José E. M. Oliveira
    Abstract:

    The coconut production system, in which the coconut mite Aceria guerreronis is considered a key pest, provides an interesting model for integration of biological and chemical control. In Brazil, the most promising biological control agent for the coconut mite is the phytoseiid predator Neoseiulus baraki . However, Acaricides are widely used to control the coconut mite, although they frequently produce unsatisfactory results. In this study, we evaluated the simultaneous direct effect of dry residue contact and contaminated prey ingestion of the main Acaricides used on coconut palms (i.e., abamectin, azadirachtin and fenpyroximate) on life-history traits of N. baraki and their offspring. These Acaricides are registered, recommended and widely used against A. guerreronis in Brazil, and they were tested at their label rates. The offspring of the exposed predators was also evaluated by estimating the instantaneous rate of population increase ( r _ i ). Abamectin compromised female performance, whereas fenpyroximate did not affect the exposed females (F0). Nonetheless, fenpyroximate strongly compromised the offspring (F1) net reproductive rate (R_0), intrinsic rate of population growth ( r _ i ), and doubling time (DT). In contrast, fenpyroximate did not have such effects on the 2nd generation (F2) of predators with acaricide-exposed grandparents. Azadirachtin did not affect the predators, suggesting that this acaricide can be used in association with biological control by this predatory species. In contrast, the use of abamectin and fenpyroximate is likely to lead to adverse consequences in the biological control of A. guerreronis using N. baraki .

  • Acaricide-impaired functional predation response of the phytoseiid mite Neoseiulus baraki to the coconut mite Aceria guerreronis
    Ecotoxicology, 2015
    Co-Authors: D. B. Lima, J. W. S. Melo, J. E. M. Oliveira, Manoel G. C. Gondim, R N C Guedes, Angelo Pallini
    Abstract:

    Acaricides may interfere with a myriad of interactions among arthropods, particularly predator–prey interactions. The coconut mite, Aceria guerreronis Keifer (Acari: Eriophyidae), and its phytoseiid predator, Neoseiulus baraki (Athias-Henriot) (Acari: Phytoseiidae), provide an opportunity to explore such interference because the former is a key coconut pest species that requires both predation and acaricide application for its management. The objective of the present study was to assess the effect of the Acaricides abamectin, azadirachtin and fenpyroximate on the functional response of N. baraki to A. guerreronis densities. The following prey densities were tested: 5, 10, 20, 40 and 80 preys. The type of functional response and prey handling time ( Th ) were not altered by the Acaricides. However, the attack rate ( a′ ) was modified by abamectin and fenpyroximate, and the consumption peak was reduced by abamectin. All of the Acaricides allowed for the maintenance of the predator in the field, but exposure to abamectin and fenpyroximate compromised prey consumption.

  • Survival and behavioural response to Acaricides of the coconut mite predator Neoseiulus baraki.
    Experimental and Applied Acarology, 2012
    Co-Authors: D. B. Lima, J. W. S. Melo, Angelo Pallini, R N C Guedes, Herbert A.a. Siqueira, Manoel G. C. Gondim
    Abstract:

    The coconut mite, Aceria guerreronis Keifer, is a major pest of coconut palm in the world. The control of this pest species is done through acaricide applications at short time intervals. However, the predators of this pest may also be affected by Acaricides. Among the predators of A. guerreronis, Neoseiulus baraki (Athias-Henriot) has potential for biological control. The objective of this study was to assess the effect of Acaricides on the survival and behavior of N. baraki. The survivorship of N. baraki was recorded in surface-impregnated arenas. Choice and no-choice behavioral bioassays were carried out using a video tracking system to assess the walking behavior of the predator under acaricide exposure. Although all Acaricides negatively affected the survival of N. baraki, chlorfenapyr and azadirachtin caused lower effect than the other Acaricides. No significant differences in walking behavior were observed under exposure to fenpyroximate, chlorfenapyr and chlorpyrifos on fully-contaminated arenas. Azadirachtin and chlorpyrifos caused repellence. Irritability was observed for all Acaricides, except for abamectin. Chlorfenapyr was the most suitable product for managing the coconut mite because of its low effect on survival and behavior of N. baraki.

Fang Zhu - One of the best experts on this subject based on the ideXlab platform.

  • rna interference of nadph cytochrome p450 reductase increases susceptibilities to multiple Acaricides in tetranychus urticae
    Pesticide Biochemistry and Physiology, 2020
    Co-Authors: Adekunle W. Adesanya, Mark D. Lavine, Laura Corley Lavine, Antonio Cardenas, Douglas B Walsh, Fang Zhu
    Abstract:

    The two-spotted spider mite, Tetranychus urticae, is a polyphagous pest feeding on over 1100 plant species, including numerous highly valued economic crops. The control of T. urticae largely depends on the use of Acaricides, which leads to pervasive development of acaricide resistance. Cytochrome P450-mediated metabolic detoxification is one of the major mechanisms of acaricide resistance in T. urticae. NADPH-cytochrome P450 reductase (CPR) plays as a crucial co-factor protein that donates electron(s) to microsomal cytochrome P450s to complete their catalytic cycle. This study seeks to understand the involvement of CPR/P450 in acaricide resistance in T. urticae. The full-length cDNA sequence of T. urticae's CPR (TuCPR) was cloned and characterized. TuCPR was ubiquitously transcribed in different life stages of T. urticae and the highest transcription was observed in the nymph and adult stages. TuCPR was constitutively over-expressed in six acaricide resistant populations compared to a susceptible one. TuCPR transcriptional expression was also induced by multiple Acaricides in a time-dependent manner. Down-regulation of TuCPR via RNA interference (RNAi) in T. urticae led to reduced enzymatic activities of TuCPR and cytochrome P450s, as well as a reduction of resistance to multiple Acaricides, abamectin, bifenthrin, and fenpyroximate. The outcome of this study highlights CPR as a potential novel target for eco-friendly control of T. urticae and other related plant-feeding pests.

  • Physiological resistance alters behavioral response of Tetranychus urticae to Acaricides.
    Scientific Reports, 2019
    Co-Authors: Adekunle W. Adesanya, Michael J. Beauchamp, Mark D. Lavine, Laura Corley Lavine, Fang Zhu, Doug B. Walsh
    Abstract:

    Multiple acaricide resistance in Tetranychus urticae continues to threaten crop production globally, justifying the need to adequately study resistance for sustainable pest management. Most studies on acaricide resistance have focused on the acute contact toxicity of Acaricides with little or no information on the behavioral responses elicited after acaricide exposure. Furthermore, the impact of physiological resistance on these behavioral responses remains unknown in most pest species, including T. urticae. We tested the effect of acaricide resistance on contact toxicity, irritancy and repellency of mitochondrial electron transport inhibitor of complex I (MET-I) and mite growth inhibitor (MGI) Acaricides on multiple T. urticae strains. We also tested whether Acaricides with similar physiological target site/mode of action also elicit similar behavioral effects on T. urticae strains. MET-I Acaricides (fenazaquin, fenpyroximate, and pyrabiden) and MGIs (clofentezine, hexythiazox and etoxazole) elicited a dose-dependent irritant and repellent effect on T. urticae. Selection of strains for physiological resistance to these Acaricides affected the behavioral response of T. urticae, especially in MET-I resistant strains, that showed reduced irritancy and repellency to MET-I Acaricides. Behavioral response also affected the oviposition of T. urticae, where strains generally showed preferential oviposition away from the Acaricides. The outcome of this study highlights negative consequences of acaricide resistance that can potentially affect T. urticae management.

  • rna interference of nadph cytochrome p450 reductase increases susceptibilities to multiple Acaricides in tetranychus urticae
    bioRxiv, 2019
    Co-Authors: Adekunle W. Adesanya, Mark D. Lavine, Laura Corley Lavine, Antonio Cardenas, Douglas B Walsh, Fang Zhu
    Abstract:

    The two-spotted spider mite, Tetranychus urticae, is a polyphagous pest feeding on over 1,100 plant species, including numerous highly valued economic crops. The control of T. urticae largely depends on the use of Acaricides, which leads to pervasive development of acaricide resistance. Cytochrome P450-mediated metabolic detoxification is one of the major mechanisms of acaricide resistance in T. urticae. NADPH-cytochrome P450 reductase (CPR) plays as a crucial co-factor protein that donates electron(s) to microsomal cytochrome P450s to complete their catalytic cycle. This study seeks to understand the involvement of CPR in acaricide resistance in urticae. The full-length cDNA sequence of T. urticaes CPR (TuCPR) was cloned and characterized. TuCPR was ubiquitously transcribed in different life stages of T. urticae and the highest transcription was observed in the nymph and adult stages. TuCPR was constitutively over-expressed in six acaricide resistant populations compared to a susceptible one. TuCPR transcriptional expression was also induced by multiple Acaricides in a time-dependent manner. Down-regulation of TuCPR via RNA interference (RNAi) in T. urticae led to reduced enzymatic activities of TuCPR and cytochrome P450s, as well as a significant reduction of resistance to multiple Acaricides, abamectin, bifenthrin, and fenpyroximate. The outcome of this study highlights CPR as a potential novel target for eco-friendly control of T. urticae and other related plant-feeding pests.nnHighlightsO_LIPipernoyl butoxide significantly reduced abamectin, bifenthrin, and fenpyroximate resistance in T. urticae populationsnC_LIO_LIT. urticaes cytochrome P450 reductase (TuCPR) was cloned, sequenced and phylogenetically analyzednC_LIO_LIAbamectin, bifenthrin and fenpyroximate treatment induced TuCPR gene expressionnC_LIO_LISilencing of TuCPR in T. urticae caused a reduction in acaricide resistancenC_LI

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