The Experts below are selected from a list of 294 Experts worldwide ranked by ideXlab platform
Zhi-wei Deng - One of the best experts on this subject based on the ideXlab platform.
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Feeding Deterrents from the tubers of Boschniakia himalaica against the red flour beetle, Tribolium castaneum
Journal of Medicinal Plants Research, 2012Co-Authors: Jie Cao, Zhi Long Liu, Zhi-wei DengAbstract:In our screening program for new agrochemicals from Chinese medicinal herbs and local wild plants, MeOH/CHCl3 extract of the tubers of Boschniakia himalaica was found to possess strong feeding Deterrent activity against the red flour beetle, Tribolium castaneum. From the MeOH/CHCl3 extract, three feeding Deterrents were isolated by bioassay-guided fractionation. The constituent compounds were isolated and identified as 3β-acetoxyurs-12-en-28-oic acid (1), 3β-acetoxyurs-28,13-olide (2) and (+)pinoresinol monoglucoside (3) based on high-resolution electron impact mass spectrometry and nuclear magnetic resonance. Compounds 1, 2 and 3 exhibited feeding Deterrent activity against T. castaneum adults with ED50 values of 378, 940 and 609 ppm, respectively.
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antifeedant diterpenoids against tribolium castaneum from the stems and twigs of ceriops tagal rhizophoraceae
Molecules, 2011Co-Authors: Shu-shan Du, Hai-ming Zhang, Cheng-fang Wang, Jing Li, Zhi-wei DengAbstract:Abstract: The screening of several Chinese mangrove plants for insecticidal principles showed that ethanol extract of Ceriops tagal stems and twigs possessed significant feeding Deterrent activity against the red flour beetle, Tribolium castaneum (Family: Rhizophoraceae). From the ethanol extract, three feeding Deterrent diterpenoids were isolated by bioassay-guided fractionation. The compounds were identified as tagalsin A, B, and H on the basis of their phytochemical and spectral data. Tagalsin A, B, and H exhibited strong feeding Deterrent activity against T. castaneum adults with EC 50 values of 375.3 ppm, 277.3 ppm, and 285.45 ppm, respectively. Keywords: feeding Deterrents; Ceriops tagal ; Tribolium castaneum ; tagalsin 1. Introduction The red flour beetle [ Tribolium castaneum (Herbst)] is one of the most widespread and destructive primary insect pests of stored cereals [1]. Infestations not only cause significant losses due to the consumption of grains; they also result in elevated temperature and moisture conditions that lead to an accelerated growth of molds, including toxigenic species [2]. Botanical pesticides have the advantage of providing novel modes of action against insects that can reduce the risk of cross-resistance as well
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Feeding Deterrents from Aconitum episcopale roots against the red flour beetle, Tribolium castaneum.
Journal of agricultural and food chemistry, 2011Co-Authors: Zhi Long Liu, Jie Cao, Hai Min Zhang, Li Li Lin, Hui Juan Liu, Ligang Zhou, Zhi-wei DengAbstract:The screening for insecticidal principles from several Chinese medicinal herbs showed that the ethanol extract of Aconitum episcopale roots possessed significant feeding deterrence against the red flour beetle, Tribolium castaneum . From the ethanol extract, six feeding Deterrents were isolated by bioassay-guided fractionation. The compounds were identified as chasmanine, crassicauline A, karacoline, sachaconitine, talatisamine, and yunaconitine from their spectroscopic data. Chasmanine, talatisamine, karacoline, and sachaconitine exhibited feeding Deterrent activity against T. castaneum adults, with EC(50) values of 297.0, 342.8, 395.3, and 427.8 ppm, respectively. Yunaconitine and crassicauline A also possessed feeding Deterrent activity against T. castaneum adults, with EC(50) values of 653.4 and 1134.5 ppm, respectively.
Murray B Isman - One of the best experts on this subject based on the ideXlab platform.
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dialkoxybenzene and dialkoxyallylbenzene feeding and oviposition Deterrents against the cabbage looper trichoplusia ni potential insect behavior control agents
Journal of Agricultural and Food Chemistry, 2010Co-Authors: Yasmin Akhtar, Yang Yu, Murray B Isman, Erika PlettnerAbstract:The antifeedant, oviposition Deterrent, and toxic effects of individual dialkoxybenzene compounds/sets and of hydroxy- or alkoxy-substituted allylbenzenes, obtained through Claisen rearrangement of substituted allyloxybenzenes, were assessed against the cabbage looper, Trichoplusia ni, in laboratory bioassays. Most of the compounds/sets strongly deterred larval feeding, with some exhibiting mild toxic and oviposition Deterrent effects as well. Some of the compounds/sets were more active than the commercial insect repellent, DEET (N,N-diethyl-m-toluamide), as both feeding and oviposition Deterrents against the cabbage looper. On the basis of the obtained oviposition data a general hypothesis was proposed regarding the oviposition sites: one binding mode with the alkyl and allyl groups on the same side of the benzene ring resulted in deterrence, the other with alkyl and allyl groups on opposite sides of the benzene ring resulted in stimulation. The results suggest some structure−activity relationships usefu...
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generalization of a habituated feeding Deterrent response to unrelated antifeedants following prolonged exposure in a generalist herbivore trichoplusia ni
Journal of Chemical Ecology, 2004Co-Authors: Yasmin Akhtar, Murray B IsmanAbstract:The possibility of generalization of habituated response to unrelated feeding Deterrents following prolonged exposure was examined in third instar Trichoplusia ni (Lepidoptera: Noctuidae) larvae by rearing them on antifeedants and then testing with other unrelated antifeedants. We introduced neonate larvae (<24-hr old) onto cabbage leaves treated with crude seed extracts of Melia volkensii (Meliaceae) or oil of Origanum vulgare (“oregano”) (Lamiaceae) and allowed them to feed until early in the third instar. Naive larvae were reared on cabbage leaves treated with carrier solvent alone. Both experienced and naive larvae were tested for feeding Deterrent response with the same and the different extracts in a leaf disc choice bioassay. Habituation was generalized to both M. volkensii and oregano following prolonged exposure to either plant extract and also to a pure allelochemical, thymol, following prolonged exposure to either digitoxin or xanthotoxin. However, there was no generalization of the habituated response to oregano following prolonged exposure to digitoxin or thymol, or to thymol or xanthotoxin following prolonged exposure to oregano or M. volkensii. Our results demonstrate that habituated response to feeding Deterrents in a polyphagous insect herbivore can be generalized among and between plant extracts and pure allelochemicals, but not in all situations. The implications of such behavioral plasticity in herbivorous insects for the use of antifeedants as crop protectants or for host plant shifts is discussed.
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comparative growth inhibitory and antifeedant effects of plant extracts and pure allelochemicals on four phytophagous insect species
Journal of Applied Entomology, 2004Co-Authors: Yasmin Akhtar, Murray B IsmanAbstract:Antifeedant and growth inhibitory effects of crude plant extracts (Melia volkensii and Origanum vulgare) and pure allelochemicals (digitoxin, cymarin, xanthotoxin, toosendanin, thymol and trans-anethole) were investigated in the cabbage looper (Trichoplusia ni), and in the armyworm (Pseudaletia unipuncta) using different bioassays. Antifeedant effects of M. volkensii, O. vulgare and thymol were investigated in larvae of the diamondback moth (Plutella xylostella), and of O. vulgare and thymol in the Mexican bean beetle (Epilachna varivestis), using leaf disc choice bioassays. M. volkensii was the most potent growth inhibitor for T. ni and P. unipuncta (dietary EC 50 = 7.6 and 12.5 p.p.m., respectively) of all the test substances. Cymarin was the second most potent growth inhibitor (EC 50 = 132.0 p.p.m.) for T. ni. The most effective feeding Deterrents for third instar T. ni larvae were xanthotoxin and M. volkensii (DC 50 = 0.9 and 8.3 μg/cm 2 , respectively). M. volkensii was also the most potent feeding Deterrent for third instar P. unipuncta, P. xylostella and adult E. varivestis (DC 50 = 10.5, 20.7 and 2.3 μg/cm 2 , respectively). Because of interspecific differences in response to feeding Deterrents and the lack of a strong relationship between EC 50 and DC 50 values, we recommend testing a battery of bioassay species with candidate compounds and the use of more than one bioassay. Based on their growth inhibitory and feeding Deterrent properties, some of these plant extracts and pure allelochemicals have potential for use as alternative crop protectants against a number of pest species.
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binary mixtures of feeding Deterrents mitigate the decrease in feeding Deterrent response to antifeedants following prolonged exposure in the cabbage looper trichoplusia ni lepidoptera noctuidae
Chemoecology, 2003Co-Authors: Yasmin Akhtar, Murray B IsmanAbstract:The effect of rearing larvae of Trichoplusia ni on individual feeding Deterrents or on binary mixtures of Deterrents on their subsequent gustatory sensitivity was measured in paired choice leaf disc bioassays. Our working hypothesis was that mixtures of antifeedants (pure allelochemicals) would mitigate decreased feeding Deterrent response following prolonged exposure in this generalist herbivore. Neonate larvae were reared on cabbage leaves treated with individual feeding Deterrents (digitoxin, thymol, toosendanin or xanthotoxin), or with binary mixtures of these until the third instar. Feeding Deterrent responses to each antifeedant or mixture was then determined in a leaf disc choice bioassay. All of the mixtures produced additive deterrence when presented to naive larvae. Larvae reared on individual antifeedants showed a significantly decreased feeding Deterrent response (except to digitoxin), whereas larvae reared on binary mixtures of antifeedants did not show a decreased feeding Deterrent response to any of them. Such mixtures were synergistic in terms of their feeding deterrence to “experienced” larvae. Our experiment supports the hypothesis (Jermy 1986) that mixtures of Deterrents can prevent decreased feeding Deterrent response following prolonged exposure, and provides one explanation for the multiplicity of chemical defenses found in many plants.
Yasmin Akhtar - One of the best experts on this subject based on the ideXlab platform.
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dialkoxybenzene and dialkoxyallylbenzene feeding and oviposition Deterrents against the cabbage looper trichoplusia ni potential insect behavior control agents
Journal of Agricultural and Food Chemistry, 2010Co-Authors: Yasmin Akhtar, Yang Yu, Murray B Isman, Erika PlettnerAbstract:The antifeedant, oviposition Deterrent, and toxic effects of individual dialkoxybenzene compounds/sets and of hydroxy- or alkoxy-substituted allylbenzenes, obtained through Claisen rearrangement of substituted allyloxybenzenes, were assessed against the cabbage looper, Trichoplusia ni, in laboratory bioassays. Most of the compounds/sets strongly deterred larval feeding, with some exhibiting mild toxic and oviposition Deterrent effects as well. Some of the compounds/sets were more active than the commercial insect repellent, DEET (N,N-diethyl-m-toluamide), as both feeding and oviposition Deterrents against the cabbage looper. On the basis of the obtained oviposition data a general hypothesis was proposed regarding the oviposition sites: one binding mode with the alkyl and allyl groups on the same side of the benzene ring resulted in deterrence, the other with alkyl and allyl groups on opposite sides of the benzene ring resulted in stimulation. The results suggest some structure−activity relationships usefu...
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generalization of a habituated feeding Deterrent response to unrelated antifeedants following prolonged exposure in a generalist herbivore trichoplusia ni
Journal of Chemical Ecology, 2004Co-Authors: Yasmin Akhtar, Murray B IsmanAbstract:The possibility of generalization of habituated response to unrelated feeding Deterrents following prolonged exposure was examined in third instar Trichoplusia ni (Lepidoptera: Noctuidae) larvae by rearing them on antifeedants and then testing with other unrelated antifeedants. We introduced neonate larvae (<24-hr old) onto cabbage leaves treated with crude seed extracts of Melia volkensii (Meliaceae) or oil of Origanum vulgare (“oregano”) (Lamiaceae) and allowed them to feed until early in the third instar. Naive larvae were reared on cabbage leaves treated with carrier solvent alone. Both experienced and naive larvae were tested for feeding Deterrent response with the same and the different extracts in a leaf disc choice bioassay. Habituation was generalized to both M. volkensii and oregano following prolonged exposure to either plant extract and also to a pure allelochemical, thymol, following prolonged exposure to either digitoxin or xanthotoxin. However, there was no generalization of the habituated response to oregano following prolonged exposure to digitoxin or thymol, or to thymol or xanthotoxin following prolonged exposure to oregano or M. volkensii. Our results demonstrate that habituated response to feeding Deterrents in a polyphagous insect herbivore can be generalized among and between plant extracts and pure allelochemicals, but not in all situations. The implications of such behavioral plasticity in herbivorous insects for the use of antifeedants as crop protectants or for host plant shifts is discussed.
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comparative growth inhibitory and antifeedant effects of plant extracts and pure allelochemicals on four phytophagous insect species
Journal of Applied Entomology, 2004Co-Authors: Yasmin Akhtar, Murray B IsmanAbstract:Antifeedant and growth inhibitory effects of crude plant extracts (Melia volkensii and Origanum vulgare) and pure allelochemicals (digitoxin, cymarin, xanthotoxin, toosendanin, thymol and trans-anethole) were investigated in the cabbage looper (Trichoplusia ni), and in the armyworm (Pseudaletia unipuncta) using different bioassays. Antifeedant effects of M. volkensii, O. vulgare and thymol were investigated in larvae of the diamondback moth (Plutella xylostella), and of O. vulgare and thymol in the Mexican bean beetle (Epilachna varivestis), using leaf disc choice bioassays. M. volkensii was the most potent growth inhibitor for T. ni and P. unipuncta (dietary EC 50 = 7.6 and 12.5 p.p.m., respectively) of all the test substances. Cymarin was the second most potent growth inhibitor (EC 50 = 132.0 p.p.m.) for T. ni. The most effective feeding Deterrents for third instar T. ni larvae were xanthotoxin and M. volkensii (DC 50 = 0.9 and 8.3 μg/cm 2 , respectively). M. volkensii was also the most potent feeding Deterrent for third instar P. unipuncta, P. xylostella and adult E. varivestis (DC 50 = 10.5, 20.7 and 2.3 μg/cm 2 , respectively). Because of interspecific differences in response to feeding Deterrents and the lack of a strong relationship between EC 50 and DC 50 values, we recommend testing a battery of bioassay species with candidate compounds and the use of more than one bioassay. Based on their growth inhibitory and feeding Deterrent properties, some of these plant extracts and pure allelochemicals have potential for use as alternative crop protectants against a number of pest species.
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binary mixtures of feeding Deterrents mitigate the decrease in feeding Deterrent response to antifeedants following prolonged exposure in the cabbage looper trichoplusia ni lepidoptera noctuidae
Chemoecology, 2003Co-Authors: Yasmin Akhtar, Murray B IsmanAbstract:The effect of rearing larvae of Trichoplusia ni on individual feeding Deterrents or on binary mixtures of Deterrents on their subsequent gustatory sensitivity was measured in paired choice leaf disc bioassays. Our working hypothesis was that mixtures of antifeedants (pure allelochemicals) would mitigate decreased feeding Deterrent response following prolonged exposure in this generalist herbivore. Neonate larvae were reared on cabbage leaves treated with individual feeding Deterrents (digitoxin, thymol, toosendanin or xanthotoxin), or with binary mixtures of these until the third instar. Feeding Deterrent responses to each antifeedant or mixture was then determined in a leaf disc choice bioassay. All of the mixtures produced additive deterrence when presented to naive larvae. Larvae reared on individual antifeedants showed a significantly decreased feeding Deterrent response (except to digitoxin), whereas larvae reared on binary mixtures of antifeedants did not show a decreased feeding Deterrent response to any of them. Such mixtures were synergistic in terms of their feeding deterrence to “experienced” larvae. Our experiment supports the hypothesis (Jermy 1986) that mixtures of Deterrents can prevent decreased feeding Deterrent response following prolonged exposure, and provides one explanation for the multiplicity of chemical defenses found in many plants.
Zhi Long Liu - One of the best experts on this subject based on the ideXlab platform.
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Feeding Deterrents from the tubers of Boschniakia himalaica against the red flour beetle, Tribolium castaneum
Journal of Medicinal Plants Research, 2012Co-Authors: Jie Cao, Zhi Long Liu, Zhi-wei DengAbstract:In our screening program for new agrochemicals from Chinese medicinal herbs and local wild plants, MeOH/CHCl3 extract of the tubers of Boschniakia himalaica was found to possess strong feeding Deterrent activity against the red flour beetle, Tribolium castaneum. From the MeOH/CHCl3 extract, three feeding Deterrents were isolated by bioassay-guided fractionation. The constituent compounds were isolated and identified as 3β-acetoxyurs-12-en-28-oic acid (1), 3β-acetoxyurs-28,13-olide (2) and (+)pinoresinol monoglucoside (3) based on high-resolution electron impact mass spectrometry and nuclear magnetic resonance. Compounds 1, 2 and 3 exhibited feeding Deterrent activity against T. castaneum adults with ED50 values of 378, 940 and 609 ppm, respectively.
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Feeding Deterrents from Aconitum episcopale roots against the red flour beetle, Tribolium castaneum.
Journal of agricultural and food chemistry, 2011Co-Authors: Zhi Long Liu, Jie Cao, Hai Min Zhang, Li Li Lin, Hui Juan Liu, Ligang Zhou, Zhi-wei DengAbstract:The screening for insecticidal principles from several Chinese medicinal herbs showed that the ethanol extract of Aconitum episcopale roots possessed significant feeding deterrence against the red flour beetle, Tribolium castaneum . From the ethanol extract, six feeding Deterrents were isolated by bioassay-guided fractionation. The compounds were identified as chasmanine, crassicauline A, karacoline, sachaconitine, talatisamine, and yunaconitine from their spectroscopic data. Chasmanine, talatisamine, karacoline, and sachaconitine exhibited feeding Deterrent activity against T. castaneum adults, with EC(50) values of 297.0, 342.8, 395.3, and 427.8 ppm, respectively. Yunaconitine and crassicauline A also possessed feeding Deterrent activity against T. castaneum adults, with EC(50) values of 653.4 and 1134.5 ppm, respectively.
Jie Cao - One of the best experts on this subject based on the ideXlab platform.
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Feeding Deterrents from the tubers of Boschniakia himalaica against the red flour beetle, Tribolium castaneum
Journal of Medicinal Plants Research, 2012Co-Authors: Jie Cao, Zhi Long Liu, Zhi-wei DengAbstract:In our screening program for new agrochemicals from Chinese medicinal herbs and local wild plants, MeOH/CHCl3 extract of the tubers of Boschniakia himalaica was found to possess strong feeding Deterrent activity against the red flour beetle, Tribolium castaneum. From the MeOH/CHCl3 extract, three feeding Deterrents were isolated by bioassay-guided fractionation. The constituent compounds were isolated and identified as 3β-acetoxyurs-12-en-28-oic acid (1), 3β-acetoxyurs-28,13-olide (2) and (+)pinoresinol monoglucoside (3) based on high-resolution electron impact mass spectrometry and nuclear magnetic resonance. Compounds 1, 2 and 3 exhibited feeding Deterrent activity against T. castaneum adults with ED50 values of 378, 940 and 609 ppm, respectively.
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Feeding Deterrents from Aconitum episcopale roots against the red flour beetle, Tribolium castaneum.
Journal of agricultural and food chemistry, 2011Co-Authors: Zhi Long Liu, Jie Cao, Hai Min Zhang, Li Li Lin, Hui Juan Liu, Ligang Zhou, Zhi-wei DengAbstract:The screening for insecticidal principles from several Chinese medicinal herbs showed that the ethanol extract of Aconitum episcopale roots possessed significant feeding deterrence against the red flour beetle, Tribolium castaneum . From the ethanol extract, six feeding Deterrents were isolated by bioassay-guided fractionation. The compounds were identified as chasmanine, crassicauline A, karacoline, sachaconitine, talatisamine, and yunaconitine from their spectroscopic data. Chasmanine, talatisamine, karacoline, and sachaconitine exhibited feeding Deterrent activity against T. castaneum adults, with EC(50) values of 297.0, 342.8, 395.3, and 427.8 ppm, respectively. Yunaconitine and crassicauline A also possessed feeding Deterrent activity against T. castaneum adults, with EC(50) values of 653.4 and 1134.5 ppm, respectively.
