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Analía Concellón - One of the best experts on this subject based on the ideXlab platform.
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The plant age influences eggplant fruit growth, metabolic activity, texture and shelf-life
Scientia Horticulturae, 2020Co-Authors: Lucía Valerga, Magalí Darré, María José Zaro, Ariel Roberto Vicente, María Laura Lemoine, Analía ConcellónAbstract:Abstract Vegetable quality shows extensive variation along a single production cycle depending on the harvest season. So far, these effects have been mostly attributed to variations in preharvest climatic conditions, resource availability and cultural practices. Whether or not some of these differences are also influenced by variations in the plant age is unknown. The aim of this work was to evaluate if the plant age modulates eggplant fruit composition at harvest and postharvest performance. Eggplants were synchronically produced in plants having different age (4-or 9-month old). At the same dates fruit was picked and assessed for quality at three developmental stages: Baby (9 cm long), Small-Commercially Mature (Small-CM, 17 cm long) and Large-Commercially Mature (Large-CM, 19 cm long). Eggplants from 4-and 9-month old plants harvested at Small-CM, were stored at 10 °C for 0, 7, 14 and 21 d and evaluated for postharvest performance. Eggplants picked in 4-month plants grew faster, reaching commercial maturity earlier than those developing in older plants. In addition, fruit growing in 4-month plants were softer and had higher respiration rate and sugar content. Instead, the plant age did not affect seed number, size or fruit antioxidant content. Finally, fruit from 4-month plants were less susceptible to postharvest dehydration and softening and stored better. Taken together results show that the plant age significantly affects eggplant fruit growth, metabolic activity, texture and shelf-life.
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Technological and nutritional characterization of wheat breads added with eggplant flour: dependence on the level of flour and the size of fruit
Journal of Food Science and Technology, 2020Co-Authors: Lucía Valerga, Analía Concellón, Natalia Andrea Quintero-ruiz, María Cecilia PuppoAbstract:Eggplant ( Solanum melongena L.) is the third solanaceous of horticultural importance in the world, after potato and tomato. In the agricultural production of this vegetable, there are post-harvest losses and waste generation. Reduction of these inconveniences can be avoided by obtaining ingredients with high nutritional value for food processing, as breadmaking. Changes in wheat dough and bread quality due to the incorporation of eggplant flour were studied. Different levels (5, 7.5, 10%) of replacement with flour from Large eggplant were analysed. The optimum level of eggplant flour (7.5%) was used for comparison technological performance of eggplant–wheat breads elaborated with flour from Eggplants of different size: small size eggplant (Baby, BE) and large size eggplant (Large, LE). Dough was characterized through farinographic (water absorption, development time, stability, softening degree) and fermentation parameters (maximum volume of fermented dough, fermentation time). Technological quality (specific volume, hardness, elasticity, number of crumb alveolus, colour of crust and crumb) and sensory analysis of breads were evaluated. Proximal composition and antioxidant activity of flour and breads were studied. Water absorption, development time and softening degree increased, while bread volume, elasticity and the area occupied by alveoli decreased with the presence of eggplant flour. Breads also became darker. Breads with 7.5% of BE, presented a harder crumb with lower luminosity than those with LE. Both type of breads were well accepted by consumers; nevertheless, BE was the bread that contains higher amount of compounds with antioxidant activity and therefore it is recommended for formulation of functional breads.
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distribution stability and fate of phenolic compounds in white and purple Eggplants solanum melongena l
Postharvest Biology and Technology, 2014Co-Authors: María José Zaro, Ariel Roberto Vicente, Alicia R Chaves, Analía ConcellónAbstract:Abstract Eggplants rank among the vegetables richest in antioxidants, but little is known about the allocation, stability, and turnover of these metabolites. The distribution, accumulation and degradation of phenolic antioxidants in the inner and outer pulp of two commercially important eggplant types (white and dark purple), at harvest and after 14 and 30 d of refrigerated storage under non-chilling conditions (10 °C and 90% RH) were determined in this study. Chlorogenic acid (ChA) was histolocalized by fluorescence with 2-aminoethyl-diphenylborinate and the activity of phenolic compounds oxidizing enzymes (polyphenoloxidase, PPO and peroxidase, POD) as well as H 2 O 2 concentration in both fruit regions was determined. During storage, dark purple fruit were more susceptible to dehydration and showed greater deterioration than white Eggplants. Both genotypes accumulated higher sugar content in the inner pulp as opposed to acids, which were more concentrated in the outer region. At harvest, pulp antioxidant capacity was similar in both eggplant types. TEAC and DPPH assays and in situ localization, showed greater total antioxidants and ChA content in the core than in the outer pulp in both white and dark purple fruit. The stability of ChA was markedly different between genotypes. In white fruit, antioxidants increased during the first two weeks of storage, remaining stable afterwards. In contrast, in dark purple Eggplants, phenolic compounds declined after an initial stage at which they accumulated. PPO and POD in vitro activities, associated mainly with fruit seeds, fibers, and vascular bundles did not correlate with pulp browning or loss of phenolic antioxidants. Instead, the reduction of ChA in the core of dark purple fruit was associated with increased production of H 2 O 2 . Results indicate that antioxidants are predominantly located in the inner pulp of Eggplants regardless of the genotype, but are more stable in white fruit. Rather than being the result of browning reactions, substantial losses of phenolic antioxidants in whole Eggplants under the recommended storage conditions likely result from seed coat development and vascular lignification in the immature fruit.
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1 methylcyclopropene 1 mcp delays senescence maintains quality and reduces browning of non climacteric eggplant solanum melongena l fruit
Postharvest Biology and Technology, 2011Co-Authors: Juan Facundo Massolo, Ariel Roberto Vicente, Analía Concellón, Alicia R ChavesAbstract:Abstract Ethylene action can be counteracted by 1-methylcyclopropene (1-MCP), which has been used during postharvest storage to maintain quality. In this work, we evaluated the effect of 1-MCP treatments on eggplant quality and phenolic metabolism during refrigerated storage. Eggplants (cv. Lucia) were harvested at commercial maturity, treated with 1-MCP (1 μL/L, 12 h at 20 °C), stored at 10 °C for 21 d and subsequently held at 20 °C for 2 d. Corresponding controls were stored at 10 °C and then transferred to 20 °C for 2 d. During storage calyx color, damage and chlorophyll content, fruit weight loss and firmness, pulp sugar content, acidity, browning and total phenolics were measured. In addition, polyphenol oxidase (PPO), pyrogallol peroxidase (POD), and phenylalanine ammonia-lyase (PAL) activities were evaluated. Fruit calyxes showed reduced damage and remained greener in 1-MCP treated than in control fruit. 1-MCP treated Eggplants showed lower weight loss. Pulp browning was clearly prevented as a consequence of 1-MCP exposure, and this was associated with delayed senescence, lower accumulation of total phenolics and reduced activity of PAL. The activity of the enzymes PPO and POD involved in the oxidation of phenolics compounds was also decreased in 1-MCP treated fruit. Results suggest that 1-MCP treatments delay senescence, prevent browning and are beneficial to complement low temperature storage and maintain quality of non-climacteric eggplant fruit.
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effect of low temperature storage on physical and physiological characteristics of eggplant fruit solanum melongena l
Lwt - Food Science and Technology, 2007Co-Authors: Analía Concellón, Maria Cristina Anon, Alicia R ChavesAbstract:Abstract Eggplant ( Solanum melongena L.) is a perishable and chilling-sensitive tropical fruit. The chilling injury (CI) symptoms as well as some physical and physiological implications were studied in Eggplants Money Maker No. 2 stored at 0 and 10 °C for 15 days. Eggplants stored at 10 °C were not damaged by temperature, whereas fruit stored at 0 °C suffered CI. Eggplant stored at 0 °C exhibited a decrease in L 0 (lightness) and ΔL (oxidation potential), increase of pH and electrolyte leakage after CI symptoms are manifested. At this temperature, flesh tissue revealed ultrastructural damage. On the other hand, skin from upper fruit section showed more lightness, reddish colouration, and lower content of anthocyanins than the central fruit section at harvest and over the entire storage period at 0 °C. In fruit stored at this temperature and in upper section, changes of anthocyanin content with time were closely proportional to the Chroma evolution (lower content of anthocyanin, lower saturation of colour).
Masami Takagi - One of the best experts on this subject based on the ideXlab platform.
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response of wollastoniella rotunda hemiptera anthocoridae to volatiles from Eggplants infested with its prey thrips palmi and tetranychus kanzawai prey species and density effects
Biological Control, 2010Co-Authors: Masayoshi Uefune, Yoshitaka Nakashima, Eiko Tagashira, Junji Takabayashi, Masami TakagiAbstract:Abstract The effects of prey species [ Thrips palmi Karny (Thysanoptera: Thripidae) and Tetranychus kanzawai Kishida (Acari: Tetranychidae)] and their densities per plant on the olfactory responses of females of the anthocorid predator Wollastoniella rotunda Yasunaga and Miyamoto (Hemiptera: Anthocoridae) to volatiles from plants that were either intact or infested by prey were investigated using a Y-tube olfactometer. W. rotunda females preferred the volatiles from intact Eggplants ( Solamum melongena ) to clean air. The females preferred volatiles from Eggplants infested with either of the two prey species at different densities (200 and 800 female prey species) over intact eggplant volatiles. The females also preferred volatiles from plants infested with 800 females to those from plants infested by 200 females of the same species. W. rotunda females preferred the odor from Eggplants infested with 200 T. kanzawai to that from Eggplants infested with 200 T. palmi . When the number of prey per plant was increased to 800, the predators showed equal preference for Eggplants infested by either of the two prey species. W. rotunda females preferred the odor from the Eggplants infested with 800 T. palmi to that from the Eggplants infested with 200 T. kanzawai , and the odor from Eggplants infested with 800 T. kanzawai to that from Eggplants infested with 200 T. palmi. The preferences of W. rotunda for infested Eggplants were discussed from the viewpoints of using this predator for the biological control of T. palmi and T. kanzawai .
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Cage evaluation of augmentative biological control of Thrips palmi with Wollastoniella rotunda in winter greenhouses
Entomologia Experimentalis et Applicata, 2004Co-Authors: Yoshitaka Nakashima, Yoshimi Hirose, Katsuya Shima, Masayoshi Uefune, Eiko Tagashira, Seiko Maeda, Kazuya Nagai, Masami TakagiAbstract:Cage trials of an anthocorid predator, Wollastoniella rotunda Yasunaga et Miyamoto, as a biological control agent of Thrips palmi Karny were conducted in Fukuoka, Japan, under winter greenhouse production conditions. Females of W. rotunda were released on caged Eggplants, and placed in two greenhouses on 27 October. The development, population growth, and effectiveness of W. rotunda were observed until early March. Results from the cage trials showed that W. rotunda successfully developed, reproduced, and suppressed T. palmi populations under the conditions found in winter greenhouses. During the experiment, one full generation and a second generation of adult predators occurred. The T. palmi population which was exposed to predators remained at a low density throughout the trial period, but it increased dramatically on Eggplants without W. rotunda. The maximum difference between predator treatments and controls was approximately 10-fold by the end of January. Wollastoniella rotunda has the potential to be an effective control agent for T. palmi on eggplant, even during the winter in temperate regions.
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Presence-absence density estimation of Thrips palmi Karny on field eggplant.
Japanese Journal of Applied Entomology and Zoology, 2000Co-Authors: Masami Takagi, Yoshimi Hirose, Yoshitaka Nakashima, Katsuya ShimaAbstract:The mean density of Thrips palmi on field Eggplants was estimated from the proportion of infested eggplant leaves using the equation of Kono and Sugino (1958). Population size was found to be estimated by m=(−2.94×1n(1−p))1.56, where m is the density per leaf and p is the proportion of infested leaves.
Alicia R Chaves - One of the best experts on this subject based on the ideXlab platform.
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distribution stability and fate of phenolic compounds in white and purple Eggplants solanum melongena l
Postharvest Biology and Technology, 2014Co-Authors: María José Zaro, Ariel Roberto Vicente, Alicia R Chaves, Analía ConcellónAbstract:Abstract Eggplants rank among the vegetables richest in antioxidants, but little is known about the allocation, stability, and turnover of these metabolites. The distribution, accumulation and degradation of phenolic antioxidants in the inner and outer pulp of two commercially important eggplant types (white and dark purple), at harvest and after 14 and 30 d of refrigerated storage under non-chilling conditions (10 °C and 90% RH) were determined in this study. Chlorogenic acid (ChA) was histolocalized by fluorescence with 2-aminoethyl-diphenylborinate and the activity of phenolic compounds oxidizing enzymes (polyphenoloxidase, PPO and peroxidase, POD) as well as H 2 O 2 concentration in both fruit regions was determined. During storage, dark purple fruit were more susceptible to dehydration and showed greater deterioration than white Eggplants. Both genotypes accumulated higher sugar content in the inner pulp as opposed to acids, which were more concentrated in the outer region. At harvest, pulp antioxidant capacity was similar in both eggplant types. TEAC and DPPH assays and in situ localization, showed greater total antioxidants and ChA content in the core than in the outer pulp in both white and dark purple fruit. The stability of ChA was markedly different between genotypes. In white fruit, antioxidants increased during the first two weeks of storage, remaining stable afterwards. In contrast, in dark purple Eggplants, phenolic compounds declined after an initial stage at which they accumulated. PPO and POD in vitro activities, associated mainly with fruit seeds, fibers, and vascular bundles did not correlate with pulp browning or loss of phenolic antioxidants. Instead, the reduction of ChA in the core of dark purple fruit was associated with increased production of H 2 O 2 . Results indicate that antioxidants are predominantly located in the inner pulp of Eggplants regardless of the genotype, but are more stable in white fruit. Rather than being the result of browning reactions, substantial losses of phenolic antioxidants in whole Eggplants under the recommended storage conditions likely result from seed coat development and vascular lignification in the immature fruit.
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1 methylcyclopropene 1 mcp delays senescence maintains quality and reduces browning of non climacteric eggplant solanum melongena l fruit
Postharvest Biology and Technology, 2011Co-Authors: Juan Facundo Massolo, Ariel Roberto Vicente, Analía Concellón, Alicia R ChavesAbstract:Abstract Ethylene action can be counteracted by 1-methylcyclopropene (1-MCP), which has been used during postharvest storage to maintain quality. In this work, we evaluated the effect of 1-MCP treatments on eggplant quality and phenolic metabolism during refrigerated storage. Eggplants (cv. Lucia) were harvested at commercial maturity, treated with 1-MCP (1 μL/L, 12 h at 20 °C), stored at 10 °C for 21 d and subsequently held at 20 °C for 2 d. Corresponding controls were stored at 10 °C and then transferred to 20 °C for 2 d. During storage calyx color, damage and chlorophyll content, fruit weight loss and firmness, pulp sugar content, acidity, browning and total phenolics were measured. In addition, polyphenol oxidase (PPO), pyrogallol peroxidase (POD), and phenylalanine ammonia-lyase (PAL) activities were evaluated. Fruit calyxes showed reduced damage and remained greener in 1-MCP treated than in control fruit. 1-MCP treated Eggplants showed lower weight loss. Pulp browning was clearly prevented as a consequence of 1-MCP exposure, and this was associated with delayed senescence, lower accumulation of total phenolics and reduced activity of PAL. The activity of the enzymes PPO and POD involved in the oxidation of phenolics compounds was also decreased in 1-MCP treated fruit. Results suggest that 1-MCP treatments delay senescence, prevent browning and are beneficial to complement low temperature storage and maintain quality of non-climacteric eggplant fruit.
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effect of low temperature storage on physical and physiological characteristics of eggplant fruit solanum melongena l
Lwt - Food Science and Technology, 2007Co-Authors: Analía Concellón, Maria Cristina Anon, Alicia R ChavesAbstract:Abstract Eggplant ( Solanum melongena L.) is a perishable and chilling-sensitive tropical fruit. The chilling injury (CI) symptoms as well as some physical and physiological implications were studied in Eggplants Money Maker No. 2 stored at 0 and 10 °C for 15 days. Eggplants stored at 10 °C were not damaged by temperature, whereas fruit stored at 0 °C suffered CI. Eggplant stored at 0 °C exhibited a decrease in L 0 (lightness) and ΔL (oxidation potential), increase of pH and electrolyte leakage after CI symptoms are manifested. At this temperature, flesh tissue revealed ultrastructural damage. On the other hand, skin from upper fruit section showed more lightness, reddish colouration, and lower content of anthocyanins than the central fruit section at harvest and over the entire storage period at 0 °C. In fruit stored at this temperature and in upper section, changes of anthocyanin content with time were closely proportional to the Chroma evolution (lower content of anthocyanin, lower saturation of colour).
Ariel Roberto Vicente - One of the best experts on this subject based on the ideXlab platform.
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The plant age influences eggplant fruit growth, metabolic activity, texture and shelf-life
Scientia Horticulturae, 2020Co-Authors: Lucía Valerga, Magalí Darré, María José Zaro, Ariel Roberto Vicente, María Laura Lemoine, Analía ConcellónAbstract:Abstract Vegetable quality shows extensive variation along a single production cycle depending on the harvest season. So far, these effects have been mostly attributed to variations in preharvest climatic conditions, resource availability and cultural practices. Whether or not some of these differences are also influenced by variations in the plant age is unknown. The aim of this work was to evaluate if the plant age modulates eggplant fruit composition at harvest and postharvest performance. Eggplants were synchronically produced in plants having different age (4-or 9-month old). At the same dates fruit was picked and assessed for quality at three developmental stages: Baby (9 cm long), Small-Commercially Mature (Small-CM, 17 cm long) and Large-Commercially Mature (Large-CM, 19 cm long). Eggplants from 4-and 9-month old plants harvested at Small-CM, were stored at 10 °C for 0, 7, 14 and 21 d and evaluated for postharvest performance. Eggplants picked in 4-month plants grew faster, reaching commercial maturity earlier than those developing in older plants. In addition, fruit growing in 4-month plants were softer and had higher respiration rate and sugar content. Instead, the plant age did not affect seed number, size or fruit antioxidant content. Finally, fruit from 4-month plants were less susceptible to postharvest dehydration and softening and stored better. Taken together results show that the plant age significantly affects eggplant fruit growth, metabolic activity, texture and shelf-life.
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distribution stability and fate of phenolic compounds in white and purple Eggplants solanum melongena l
Postharvest Biology and Technology, 2014Co-Authors: María José Zaro, Ariel Roberto Vicente, Alicia R Chaves, Analía ConcellónAbstract:Abstract Eggplants rank among the vegetables richest in antioxidants, but little is known about the allocation, stability, and turnover of these metabolites. The distribution, accumulation and degradation of phenolic antioxidants in the inner and outer pulp of two commercially important eggplant types (white and dark purple), at harvest and after 14 and 30 d of refrigerated storage under non-chilling conditions (10 °C and 90% RH) were determined in this study. Chlorogenic acid (ChA) was histolocalized by fluorescence with 2-aminoethyl-diphenylborinate and the activity of phenolic compounds oxidizing enzymes (polyphenoloxidase, PPO and peroxidase, POD) as well as H 2 O 2 concentration in both fruit regions was determined. During storage, dark purple fruit were more susceptible to dehydration and showed greater deterioration than white Eggplants. Both genotypes accumulated higher sugar content in the inner pulp as opposed to acids, which were more concentrated in the outer region. At harvest, pulp antioxidant capacity was similar in both eggplant types. TEAC and DPPH assays and in situ localization, showed greater total antioxidants and ChA content in the core than in the outer pulp in both white and dark purple fruit. The stability of ChA was markedly different between genotypes. In white fruit, antioxidants increased during the first two weeks of storage, remaining stable afterwards. In contrast, in dark purple Eggplants, phenolic compounds declined after an initial stage at which they accumulated. PPO and POD in vitro activities, associated mainly with fruit seeds, fibers, and vascular bundles did not correlate with pulp browning or loss of phenolic antioxidants. Instead, the reduction of ChA in the core of dark purple fruit was associated with increased production of H 2 O 2 . Results indicate that antioxidants are predominantly located in the inner pulp of Eggplants regardless of the genotype, but are more stable in white fruit. Rather than being the result of browning reactions, substantial losses of phenolic antioxidants in whole Eggplants under the recommended storage conditions likely result from seed coat development and vascular lignification in the immature fruit.
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1 methylcyclopropene 1 mcp delays senescence maintains quality and reduces browning of non climacteric eggplant solanum melongena l fruit
Postharvest Biology and Technology, 2011Co-Authors: Juan Facundo Massolo, Ariel Roberto Vicente, Analía Concellón, Alicia R ChavesAbstract:Abstract Ethylene action can be counteracted by 1-methylcyclopropene (1-MCP), which has been used during postharvest storage to maintain quality. In this work, we evaluated the effect of 1-MCP treatments on eggplant quality and phenolic metabolism during refrigerated storage. Eggplants (cv. Lucia) were harvested at commercial maturity, treated with 1-MCP (1 μL/L, 12 h at 20 °C), stored at 10 °C for 21 d and subsequently held at 20 °C for 2 d. Corresponding controls were stored at 10 °C and then transferred to 20 °C for 2 d. During storage calyx color, damage and chlorophyll content, fruit weight loss and firmness, pulp sugar content, acidity, browning and total phenolics were measured. In addition, polyphenol oxidase (PPO), pyrogallol peroxidase (POD), and phenylalanine ammonia-lyase (PAL) activities were evaluated. Fruit calyxes showed reduced damage and remained greener in 1-MCP treated than in control fruit. 1-MCP treated Eggplants showed lower weight loss. Pulp browning was clearly prevented as a consequence of 1-MCP exposure, and this was associated with delayed senescence, lower accumulation of total phenolics and reduced activity of PAL. The activity of the enzymes PPO and POD involved in the oxidation of phenolics compounds was also decreased in 1-MCP treated fruit. Results suggest that 1-MCP treatments delay senescence, prevent browning and are beneficial to complement low temperature storage and maintain quality of non-climacteric eggplant fruit.
Masayoshi Uefune - One of the best experts on this subject based on the ideXlab platform.
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Experience of plant infestation by the omnivorous arthropod Nesidiocoris tenuis affects its subsequent responses to prey-infested plant volatiles
BioControl, 2017Co-Authors: Hojun Rim, Masayoshi Uefune, Rika Ozawa, Kinuyo Yoneya, Junji TakabayashiAbstract:Nesidiocoris tenuis, an omnivorous arthropod, infests plants in either the absence or presence of prey arthropods. We studied whether plant-infestation experience of N. tenuis affected its subsequent prey-finding behavior. We used sesame plants and Eggplants as food plants for N. tenuis, and common cutworm (CCW) (Spodoptera litura larvae) as prey. We focused on their olfactory response to CCW-infested sesame plants versus CCW-infested Eggplants in a Y-tube olfactometer. When N. tenuis adults experienced the infestation of sesame plants for one day, they preferred volatiles from CCW-infested sesame plants to those from CCW-infested Eggplants. By contrast, when N. tenuis experienced the infestation of Eggplants for one day, they showed no difference in their preference between the two odor sources. When the duration of the infestation of plants was increased to four days, N. tenuis that had experienced sesame plants showed a reversed response: they preferred CCW-infested eggplant volatiles, while those that had infested Eggplants again showed no difference in their preference. Next, we studied the olfactory preference of N. tenuis that had previously infested plants with moth (Ephestia kuehniella) eggs. We found that irrespective of plant species and of duration of experience (either one or four days), N. tenuis adults that had previously experienced one plant species showed a significant preference for volatiles from CCW-infested plants of the same species. The blends of the volatiles emitted from CCW-infested sesame plants and those from CCW-infested Eggplants were qualitatively different. Possibility to control the olfactory response of N. tenuis to certain prey-infested plant volatiles by adjusting their feeding history is discussed.
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olfactory response of the omnivorous mirid bug nesidiocoris tenuis to Eggplants infested by prey specificity in prey developmental stages and prey species
Biological Control, 2015Co-Authors: Hojun Rim, Masayoshi Uefune, Rika Ozawa, Junji TakabayashiAbstract:•Nesidiocoris tenuis preferred first stadium larvae of Spodoptera litura to spider mites.•Nesidiocoris tenuis attracted to uninfested eggplant volatiles.•N. tenuis attracted to prey-infested eggplant volatiles.•The attraction of infested Eggplants correlated with prey usability of N. tenuis.•Eggplants infested by first stadium larvae (ca. 0.5% damage/plant) were the most attractive.
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response of wollastoniella rotunda hemiptera anthocoridae to volatiles from Eggplants infested with its prey thrips palmi and tetranychus kanzawai prey species and density effects
Biological Control, 2010Co-Authors: Masayoshi Uefune, Yoshitaka Nakashima, Eiko Tagashira, Junji Takabayashi, Masami TakagiAbstract:Abstract The effects of prey species [ Thrips palmi Karny (Thysanoptera: Thripidae) and Tetranychus kanzawai Kishida (Acari: Tetranychidae)] and their densities per plant on the olfactory responses of females of the anthocorid predator Wollastoniella rotunda Yasunaga and Miyamoto (Hemiptera: Anthocoridae) to volatiles from plants that were either intact or infested by prey were investigated using a Y-tube olfactometer. W. rotunda females preferred the volatiles from intact Eggplants ( Solamum melongena ) to clean air. The females preferred volatiles from Eggplants infested with either of the two prey species at different densities (200 and 800 female prey species) over intact eggplant volatiles. The females also preferred volatiles from plants infested with 800 females to those from plants infested by 200 females of the same species. W. rotunda females preferred the odor from Eggplants infested with 200 T. kanzawai to that from Eggplants infested with 200 T. palmi . When the number of prey per plant was increased to 800, the predators showed equal preference for Eggplants infested by either of the two prey species. W. rotunda females preferred the odor from the Eggplants infested with 800 T. palmi to that from the Eggplants infested with 200 T. kanzawai , and the odor from Eggplants infested with 800 T. kanzawai to that from Eggplants infested with 200 T. palmi. The preferences of W. rotunda for infested Eggplants were discussed from the viewpoints of using this predator for the biological control of T. palmi and T. kanzawai .
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Cage evaluation of augmentative biological control of Thrips palmi with Wollastoniella rotunda in winter greenhouses
Entomologia Experimentalis et Applicata, 2004Co-Authors: Yoshitaka Nakashima, Yoshimi Hirose, Katsuya Shima, Masayoshi Uefune, Eiko Tagashira, Seiko Maeda, Kazuya Nagai, Masami TakagiAbstract:Cage trials of an anthocorid predator, Wollastoniella rotunda Yasunaga et Miyamoto, as a biological control agent of Thrips palmi Karny were conducted in Fukuoka, Japan, under winter greenhouse production conditions. Females of W. rotunda were released on caged Eggplants, and placed in two greenhouses on 27 October. The development, population growth, and effectiveness of W. rotunda were observed until early March. Results from the cage trials showed that W. rotunda successfully developed, reproduced, and suppressed T. palmi populations under the conditions found in winter greenhouses. During the experiment, one full generation and a second generation of adult predators occurred. The T. palmi population which was exposed to predators remained at a low density throughout the trial period, but it increased dramatically on Eggplants without W. rotunda. The maximum difference between predator treatments and controls was approximately 10-fold by the end of January. Wollastoniella rotunda has the potential to be an effective control agent for T. palmi on eggplant, even during the winter in temperate regions.