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- W1988996005 abstract "Abstract: Surveys were carried out in 2001 in brassica‐producing areas of Ethiopia to determine the geographic distribution and severity of diamondback moth (DBM) and occurrence of indigenous parasitoids. Principal component analysis was used to analyse the importance of nine parameters – DBM density, parasitism by different parasitoid species ( Oomyzus sokolowskii , Diadegma spp., Apanteles sp. and overall parasitism), cropping systems, pesticide use, frequency of pesticide application and altitude. A total of 194 brassica fields in 13 different areas were visited. Principal component analysis showed that the first two of the nine principal components (largely DBM density and pesticide use) accounted for 70% of the variation in the data set. Higher DBM numbers were associated with pesticide usage and higher overall parasitism with intercropping. Eight parasitoid species were recorded of which three species were important both in distribution and level of parasitism. These include Oomyzus sokolowskii (Hym., Eulophidae), Diadegma spp. (Hym., Ichneumonidae) and Apanteles sp. (Hym., Braconidae). Overall parasitism ranged from 3.6% to 79.5% with big differences between areas. Apanteles sp. and Diadegma spp. were largely confined to the south‐western part of Ethiopia where insecticide use is minimal. Oomyzus sokolowskii is mainly distributed in areas of the Rift Valley and northern Ethiopia with relatively heavy insecticide use. This study indicated a huge impact of repeated insecticide treatment and agronomic practices on DBM severity and its parasitoids." @default.
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- W1988996005 date "2006-07-20" @default.
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- W1988996005 title "Occurrence of the diamondback moth (Plutella xylostella L.) and its parasitoids in Ethiopia: influence of geographical region and agronomic traits" @default.
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- W1988996005 doi "https://doi.org/10.1111/j.1439-0418.2006.01078.x" @default.
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