The Experts below are selected from a list of 13590 Experts worldwide ranked by ideXlab platform
Michael J Adang - One of the best experts on this subject based on the ideXlab platform.
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reversal of resistance to bacillus thuringiensis in Plutella xylostella
Proceedings of the National Academy of Sciences of the United States of America, 1994Co-Authors: Bruce E Tabashnik, Naomi Finson, Francis R Groeters, William J Moar, Marshall W Johnson, Ke Luo, Michael J AdangAbstract:Abstract Continued success of the most widely used biopesticide, Bacillus thuringiensis, is threatened by development of resistance in pests. Experiments with Plutella xylostella (diamondback moth), the first insect with field populations resistant to B. thuringiensis, revealed factors that promote reversal of resistance. In strains of P. xylostella with 25- to 2800-fold resistance to B. thuringiensis compared with unselected strains, reversal of resistance occurred when exposure to B. thuringiensis was stopped for many generations. Reversal of resistance was associated with restoration of binding of B. thuringiensis toxin CryIA(c) to brush-border membrane vesicles and with increased biotic fitness. Compared with susceptible colonies, revertant colonies had a higher proportion of extremely resistant individuals. Revertant colonies responded rapidly to reselection for resistance. Understanding reversal of resistance will help to design strategies for extending the usefulness of this environmentally benign insecticide.
An Li-n - One of the best experts on this subject based on the ideXlab platform.
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The Spatial Distribution Patterns of the Larvae of Plutella xylostella L. in Brassica oleracea Fields
Hubei Agricultural Sciences, 2014Co-Authors: An Li-nAbstract:The spatial distribution patterns of the larvae of Plutella xylostella L. in Brassica oleracea fields were studied to provide a scientific basis for forecast and reasonable control. The number of the larvae of Plutella xylostella L. was recorded by the method of parallel type and the the spatial distribution pattern was analyzed. The spatial distribution pattern of the larvae of Plutella xylostella L. was aggregated and density-dependent. The aggregation was affected by both active process and some environmental factors. The sampling mathematic model theory will provide a reference for the best sampling number and build the sequential sampling model in controling Plutella xylostella L.
Fazuo Wang - One of the best experts on this subject based on the ideXlab platform.
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triterpenoid saponins with antifeedant activities from stem bark of catunaregam spinosa rubiaceae against Plutella xylostella plutellidae
Carbohydrate Research, 2011Co-Authors: Guangchun Gao, Shuhong Tao, Si Zhang, Fazuo WangAbstract:Seven triterpenoid saponins, including four new compounds, catunarosides A–D (1–4), and three known compounds, swartziatrioside (5), aralia-saponin V (6), araliasaponin IV (7) were isolated from the stem bark of Catunaregam spinosa, a Chinese mangrove associate. Their structures were elucidated on the basis of their spectral data and hydrolysis experiments. The antifeedant activities of compounds 1–7 against Plutella xylostella were also evaluated.
Bruce E Tabashnik - One of the best experts on this subject based on the ideXlab platform.
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reversal of resistance to bacillus thuringiensis in Plutella xylostella
Proceedings of the National Academy of Sciences of the United States of America, 1994Co-Authors: Bruce E Tabashnik, Naomi Finson, Francis R Groeters, William J Moar, Marshall W Johnson, Ke Luo, Michael J AdangAbstract:Abstract Continued success of the most widely used biopesticide, Bacillus thuringiensis, is threatened by development of resistance in pests. Experiments with Plutella xylostella (diamondback moth), the first insect with field populations resistant to B. thuringiensis, revealed factors that promote reversal of resistance. In strains of P. xylostella with 25- to 2800-fold resistance to B. thuringiensis compared with unselected strains, reversal of resistance occurred when exposure to B. thuringiensis was stopped for many generations. Reversal of resistance was associated with restoration of binding of B. thuringiensis toxin CryIA(c) to brush-border membrane vesicles and with increased biotic fitness. Compared with susceptible colonies, revertant colonies had a higher proportion of extremely resistant individuals. Revertant colonies responded rapidly to reselection for resistance. Understanding reversal of resistance will help to design strategies for extending the usefulness of this environmentally benign insecticide.
Gabriela Patriche - One of the best experts on this subject based on the ideXlab platform.
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PARASITOIDS AND HYPERPARASITOIDS IN Plutella xylostella L. (LEPIDOPTERA-PLUTELLIDAE) POPULATI ONS FROM MOLDAVIA (ROMANIA)
2006Co-Authors: Elena Feraru, Gabriela PatricheAbstract:In Romania, Plutella xylostella L. populations are controlled by an impressive number of primary parasitoids that have a high efficiency reducing the populations of this pest. However, what we have noticed in the last 20 years is the alarming increase of the number of secondary parasitoids as well as their efficiency. In our research from 2003 in eastern Romania (Moldavia), we noticed the presence of 14 primary parasitoids that reduce the number of Plutella xylostella L. populations by 80-90 %. In return, the primary parasitoids are limited by 14 species of secondary parasitoids reducing their populations with 23.20 %. Moldova (România). In România populaţiile de Plutella xylostella L. sunt controlate de un număr impresionant de specii de parazitoizi primari, a căror eficienţă in reducerea acestui dăunător este deosebit de mare. In ultimii 20 de ani insă, am constatat intrarea in cadrul acestui complex biocenotic a unui număr mare de specii de parazitoizi secundari. Acestia, mai ales in ultimii ani, reduc in mod substanţial efectul benefic al parazitoizilor primari in limitarea populaţiilor de Plutella xylostella L.. In cercetările din 2003 efectuate in estul României (Moldova) am identificat 14 specii de parazitoizi primari, care reduc populaţiile de Plutella xylostella L. cu 80- 90%, insă si prezenţa a 14 specii de parazitoizi secundari, care limitează cu peste 20%. Cuvinte cheie: Molia verzei , varza , parazitoizi, hiperparazitoizi, sinecologie, control biologic
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PARASITOIDS AND HYPERPARASITOIDS IN Plutella xylostella L. POPULATIONS FROM MOLDAVIA (ROMANIA)
2005Co-Authors: Maria Mustaţă, Elena Feraru, Gabriela PatricheAbstract:In Romania, Plutella xylostella L. populations are controlled by an impressive number of primary parasitoids that have a high efficiency reducing the populations of this pest. However, what we have noticed in the last 20 years is the alarming increase of the number of secondary parasitoids as well as their efficiency. In our research from 2003 in eastern Romania (Moldavia), we noticed the presence of 14 primary parasitoids that reduce the number of Plutella xylostella L. populations by 80-90 %. In return, the primary parasitoids are limited by 14 species of secondary parasitoids reducing their populations with 23.20 %.
