The Experts below are selected from a list of 1947 Experts worldwide ranked by ideXlab platform

Zeev Wiesman - One of the best experts on this subject based on the ideXlab platform.

  • Controlled-release systems for the Insect Growth Regulator pyriproxyfen.
    Journal of agricultural and food chemistry, 2003
    Co-Authors: Liliana Schwartz, David Wolf, Arie Markus, Slawomir Wybraniec, Zeev Wiesman
    Abstract:

    A simple technique was developed for the production of controlled-release systems (CRSs) for pyriproxyfen, an Insect Growth Regulator active against the larvae of Culex pipiens, the most common species of mosquito found in developed countries. The CRSs consisted of a spongy core material encapsulated in a coating of a polyurethane or polyurea hydrogel, into which the active ingredient had been incorporated. The coating also included a surfactant to improve the low solubility in water of pyriproxyfen. The light core material enabled the CRS to float on the water surface, where the mosquitoe larvae are found. The type and amount of the polymeric coating and the amount of surfactant influenced the release profiles into water of the active ingredient. The release profiles of the CRSs were adjusted to the life cycle of the C. pipiens mosquito in order to obtain their optimal activity on the eighth day, which corresponds to the time of larval maturity.

  • controlled release systems for the Insect Growth Regulator pyriproxyfen
    Journal of Agricultural and Food Chemistry, 2003
    Co-Authors: Liliana Schwartz, David Wolf, Arie Markus, Slawomir Wybraniec, Zeev Wiesman
    Abstract:

    A simple technique was developed for the production of controlled-release systems (CRSs) for pyriproxyfen, an Insect Growth Regulator active against the larvae of Culex pipiens, the most common species of mosquito found in developed countries. The CRSs consisted of a spongy core material encapsulated in a coating of a polyurethane or polyurea hydrogel, into which the active ingredient had been incorporated. The coating also included a surfactant to improve the low solubility in water of pyriproxyfen. The light core material enabled the CRS to float on the water surface, where the mosquitoe larvae are found. The type and amount of the polymeric coating and the amount of surfactant influenced the release profiles into water of the active ingredient. The release profiles of the CRSs were adjusted to the life cycle of the C. pipiens mosquito in order to obtain their optimal activity on the eighth day, which corresponds to the time of larval maturity. Keywords: Controlled-release systems; Insect Growth regulat...

Frank H Arthur - One of the best experts on this subject based on the ideXlab platform.

  • Susceptibility of stored grain Insects to the Insect Growth Regulator methoprene: Presentation
    Julius-Kühn-Archiv, 2018
    Co-Authors: Frank H Arthur
    Abstract:

    The Insect Growth Regulator (IGR) methoprene is labeled in the United States (US) for direct application to stored grain commodities, and as a residual surface treatment to empty grain bins and flooring surfaces inside indoor structures. Methoprene is also labeled in the US as an aerosol for use in indoor areas. One of the challenges in research with methoprene and stored product Insects is through design of experiments that mimic how methoprene would be used in practical applications. Recent research with methoprene will be used to describe experimental designs to examine efficacy of methoprene when used as a grain protectant.

  • methodology for evaluating the Insect Growth Regulator igr methoprene on packaging films
    Insects, 2016
    Co-Authors: Frank H Arthur
    Abstract:

    The Insect Growth Regulator methoprene can be mixed into the matrix used to comprise bags and other packaging materials. Different methodologies were utilized to evaluate the efficacy of different types of methoprene-treated packaging towards Tribolium castaneum (Herbst), the red flour beetle, and T. confusum Jacquelin duVal, the confused flour beetle, two common Insect species that infest stored products. Tests were conducted by creating arenas in which larvae were exposed on the packaging surface along with a flour food source, and assessments were made on adults emerging from the exposed progeny. Tests were also done by exposing adults, again with a flour food source, removing the adults after one week, and assessing adult emergence of progeny from those parental adults. In tests with larvae exposed on methoprene-treated birdseed bags, the outside surface had more activity compared to the inside surface, especially on T. confusum. In other studies with different types of packaging materials, there was generally 100% inhibition of adult emergence of exposed larvae or of progeny adults when parental adults were exposed on the methoprene-treated packaging. The best technique for evaluation was to expose late-stage larvae as the test life stage. Results show the potential of using methoprene-treated packaging for bagged storage of processed grains and grain products.

Faisal Hafeez - One of the best experts on this subject based on the ideXlab platform.

  • toxicity and resistance of field collected musca domestica diptera muscidae against Insect Growth Regulator Insecticides
    Parasitology Research, 2016
    Co-Authors: Hafiz Azhar Ali Khan, Waseem Akram, Muhammad Arshad, Faisal Hafeez
    Abstract:

    The house fly, Musca domestica, is a serious pest of public health importance with the ability to develop Insecticide resistance. The focus of the present study was to evaluate toxicity and resistance of the field collected house flies from Punjab, Pakistan, against Insect Growth Regulator (IGR) Insecticides. House flies collected from six different localities exhibited very low levels of resistance to cyromazine, triflumuron, and methoxyfenozide compared with the Lab-susceptible reference strain, with resistance ratios (RRs) ranging between 3.56- to 8.19-fold, 1.45- to 3.68-fold, and 2.20- to 8.60-fold, respectively. However, very low to low levels of resistance were observed for pyriproxyfen and very low to moderate levels for lufenuron with RRs ranged from 4.13- to 11.63-fold to 8.57- to 22.75-fold, respectively. There was a significant correlation between RRs of cyromazine and triflumuron (r = 0.976, p < 0.001), suggesting the possibility for cross-resistance. Susceptibility status of different IGRs in Pakistani strains of house flies is reported here for the first time. The trend observed in decreasing susceptibility towards different IGR Insecticides tested will continue unless resistance management practices are followed.

Liliana Schwartz - One of the best experts on this subject based on the ideXlab platform.

  • Controlled-release systems for the Insect Growth Regulator pyriproxyfen.
    Journal of agricultural and food chemistry, 2003
    Co-Authors: Liliana Schwartz, David Wolf, Arie Markus, Slawomir Wybraniec, Zeev Wiesman
    Abstract:

    A simple technique was developed for the production of controlled-release systems (CRSs) for pyriproxyfen, an Insect Growth Regulator active against the larvae of Culex pipiens, the most common species of mosquito found in developed countries. The CRSs consisted of a spongy core material encapsulated in a coating of a polyurethane or polyurea hydrogel, into which the active ingredient had been incorporated. The coating also included a surfactant to improve the low solubility in water of pyriproxyfen. The light core material enabled the CRS to float on the water surface, where the mosquitoe larvae are found. The type and amount of the polymeric coating and the amount of surfactant influenced the release profiles into water of the active ingredient. The release profiles of the CRSs were adjusted to the life cycle of the C. pipiens mosquito in order to obtain their optimal activity on the eighth day, which corresponds to the time of larval maturity.

  • controlled release systems for the Insect Growth Regulator pyriproxyfen
    Journal of Agricultural and Food Chemistry, 2003
    Co-Authors: Liliana Schwartz, David Wolf, Arie Markus, Slawomir Wybraniec, Zeev Wiesman
    Abstract:

    A simple technique was developed for the production of controlled-release systems (CRSs) for pyriproxyfen, an Insect Growth Regulator active against the larvae of Culex pipiens, the most common species of mosquito found in developed countries. The CRSs consisted of a spongy core material encapsulated in a coating of a polyurethane or polyurea hydrogel, into which the active ingredient had been incorporated. The coating also included a surfactant to improve the low solubility in water of pyriproxyfen. The light core material enabled the CRS to float on the water surface, where the mosquitoe larvae are found. The type and amount of the polymeric coating and the amount of surfactant influenced the release profiles into water of the active ingredient. The release profiles of the CRSs were adjusted to the life cycle of the C. pipiens mosquito in order to obtain their optimal activity on the eighth day, which corresponds to the time of larval maturity. Keywords: Controlled-release systems; Insect Growth regulat...

Randy Gaugler - One of the best experts on this subject based on the ideXlab platform.

  • the Insect Growth Regulator pyriproxyfen terminates egg diapause in the asian tiger mosquito aedes albopictus
    PLOS ONE, 2015
    Co-Authors: Devi Shankar Suman, Yi Wang, Randy Gaugler
    Abstract:

    The Asian tiger mosquito, Aedes albopictus, is a highly invasive mosquito species that transmits chikungunya and dengue. This species overwinters as diapausing eggs in temperate climates. Early diapause termination may be a beneficial strategy for winter mosquito control; however, a mechanism to terminate the diapause process using chemicals is not known. We tested the hypothesis that a hormonal imbalance caused by the administration of juvenile hormone analog would terminate egg diapause in A. albopictus. We tested the Insect Growth Regulator pyriproxyfen on all developmental stages to identify a susceptible stage for diapause termination. We found that pyriproxyfen treatment of mosquito eggs terminated embryonic diapause. The highest rates of diapause termination were recorded in newly deposited (78.9%) and fully embryonated (74.7%) eggs at 0.1 and 1 ppm, respectively. Hatching was completed earlier in newly deposited eggs (25–30 days) compared to fully embryonated eggs (71–80 days). The combined mortality from premature diapause termination and ovicidal activity was 98.2% in newly deposited and >98.9% in fully embryonated eggs at 1 ppm. The control diapause eggs did not hatch under diapausing conditions. Pyriproxyfen exposure to larvae, pupae and adults did not prevent the females from ovipositing diapausing eggs. There was no effect of pyriproxyfen on diapausing egg embryonic developmental time. We also observed mortality in diapausing eggs laid by females exposed to pyriproxyfen immediately after blood feeding. There was no mortality in eggs laid by females that survived larval and pupal exposures. In conclusion, diapausing eggs were the more susceptible to pyriproxyfen diapause termination compared to other life stages. This is the first report of diapause termination in A. albopictus with a juvenile hormone analog. We believe our findings will be useful in developing a new control strategy against overwintering mosquito populations.

  • dual treatment autodissemination station with enhanced transfer of an Insect Growth Regulator to mosquito oviposition sites
    Pest Management Science, 2014
    Co-Authors: Yi Wang, Limin Dong, Devi S Suman, Jacques Bertrand, Randy Gaugler
    Abstract:

    BACKGROUND:TheAsiantigermosquito,Aedesalbopictus(Skuse),transmitsimportantarboviraldiseasesanddisplacesnative species. This peridomestic mosquito deposits eggs in natural and artificial containers. Container larval habitats tend to be cryptic and, therefore, difficult to reach by conventional Insecticide treatments. We have developed an autodissemination station that transfers the Insect Growth Regulator, pyriproxyfen, from the station to oviposition sites. Mosquitoes visiting the station become contaminated with an oil sticker followed by pyriproxyfen powder before exiting. RESULTS: In a room (31m 3 ) bioassay a single station consistently achieved 100% Ae.albopictus pupal mortality against 10 oviposition containers. In a greenhouse (200m 3 ) assay with two stations and 12 oviposition cups, 91.7% of the cups had been contaminated as shown, and 57.1% pupal mortality was recorded. Pyriproxyfen transfer was also detected by visualizing mosquito ‘tarsal prints’ using a fluorescent dye. CONCLUSIONS: The oil and pyriproxyfen powder dual-treatment station enhanced autodissemination efficacy by increasing toxicant attachment and retention on contaminated females. The autodissemination station offers a targeted, less environmentally damaging approach to manage cryptic container species. c � 2013 Society of Chemical Industry

  • effects of larval habitat substrate on pyriproxyfen efficacy against aedes albopictus diptera culicidae
    Journal of Medical Entomology, 2013
    Co-Authors: Devi Shankar Suman, Limin Dong, Yi Wang, Randy Gaugler
    Abstract:

    ABSTRACT Pyriproxyfen, a juvenile hormone analog Insect Growth Regulator (IGR), is a recommended Insecticide for the control of container-inhabiting mosquitoes. The effects of eight container substrates (three plastics, wood, tire rubber, clay pot, concrete, and glass) were studied on reduction of bio-efficacy of pyriproxyfen for Aedes albopictus (Skuse) in the laboratory. Insect Growth Regulator-bioassay of third instars showed significant increase of LC50 with some substrates compared with control probably because of pyriproxyfen adsorption to the substrate. The LC50 for the control substrate (glass mug) was 0.029 µg/ liter. In comparison to the control, LC50 increased 150.1 times with tire rubber (4.354 µg/liter) and 8–10 times with wood and high-density polyethylene plastic containers. Slight increases of LC50 were detected for clay pots, polypropylene, and polystyrene plastics (1.9–2.7 times). Pyriproxyfen efficacy with concrete substrate was higher than with glass containers, which might be caused b...

  • an autodissemination station for the transfer of an Insect Growth Regulator to mosquito oviposition sites
    Medical and Veterinary Entomology, 2012
    Co-Authors: Randy Gaugler, Devi S Suman, Yi Wang
    Abstract:

    : A prototype autodissemination station to topically contaminate oviposition-seeking container-dwelling mosquitoes with the Insect Growth Regulator, pyriproxyfen, was developed and tested in the laboratory. Our test subject was the Asian tiger mosquito, Aedes albopictus (Skuse) (Diptera: Culicidae), an urban species that colonizes small-volume cryptic larval habitats and is a skip ovipositor that visits multiple containers. The station consists of a water reservoir to attract gravid females, which is joined to a transfer chamber designed to contaminate visiting mosquitoes. The unit is easily constructed by moulding wet shredded cardboard using corn starch as a binder. The essential criteria that must be met to prove the efficacy of an autodissemination station require it to demonstrate effectiveness in attracting the target Insect, in transferring the toxicant to the Insect that will disperse the agent, and in facilitating the subsequent transfer of the toxicant from the Insect to target habitats at a lethal concentration. Cage experiments demonstrated that the unit was readily accepted by gravid females as an oviposition site. A powder formulation of pyriproxyfen-impregnated silica particles adhered to visiting Ae. albopictus females (mean: 66 particles/female), although particles were lost over time. In cage (2.2 m(3) ) trials, pyriproxyfen-charged stations resulted in 100% inhibition of adult emergence, whereas in small-room (31.1 m(3) ) trials, 81% emergence inhibition was recorded. The venereal transfer of pyriproxyfen from contaminated males to virgin females was also observed, and pyriproxyfen was subsequently transferred to water-holding containers at concentrations that inhibited emergence. Key autodissemination station features include lack of maintenance requirements, biodegradable construction, low cost and low risk.