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Interaction of Metarhizium anisopliae Metsch Sorok, Beauveria bassiana Bals Vuill and the parasitoid Oomyzus sokolowskii Kurdjumov Hymenoptera Eulophidae with larvae of diamondback moth, Plutella xylostella L Lepidoptera Plutellidae Interacao de Metarhizium anisopliae Metsch Sorok, Beauveria bassiana Bals Vuill e o parasitoide Oomyzus sokolowskii Kurdjumov Hymenoptera Eulophidae sobre larvas da traga-das-cruciferas, Plutella xylostella L Lepidoptera Plutelli



Interaction of Metarhizium anisopliae Metsch Sorok, Beauveria bassiana Bals Vuill and the parasitoid Oomyzus sokolowskii Kurdjumov Hymenoptera Eulophidae with larvae of diamondback moth, Plutella xylostella L Lepidoptera Plutellidae Interacao de Metarhizium anisopliae Metsch Sorok, Beauveria bassiana Bals Vuill e o parasitoide Oomyzus sokolowskii Kurdjumov Hymenoptera Eulophidae sobre larvas da traga-das-cruciferas, Plutella xylostella L Lepidoptera Plutelli



Neotropical Entomology. March-April; 352: 241-245



Chemical insecticides are broadly applied to control diamondback moth, Plutella xylostella (L.). Diamondback moth is a major pest of cruciferous; worldwide, and resistance of this pest to insecticide has been often reported. Thus, this research investigated the interactions among the fungi Metarhizium anisopliae (Metsch.) Sorok., Beauveria bassiana (Bals.) Vuill., and the larval-pupal parasitoid Oomyzus sokolowskii (Kurdjurmov) before and after application of the fungi on DBM larvae offered to the parasitoid. The experiment was carried out at 26 plus or minus 1deg. C, 75 5% RH and 12h photophase using a completely randomized design, with eight treatments with six replications each. The isolates E9 of M anisopliae and ESALQ 447 of B. bassiana, were used at the concentration of 107 conidia ml-1. The results showed that M anisopliae and B. bassiana reduced the parasitism of P xylostella by O. sokoloivskii. Additive effects were found on the mortality of P xylostella with the different combinations among the fungi and parasitoid, except for the treatment B. bassiana inoculated 24h before exposition of the larvae to O. sokolowskii. The isolates were more efficacious when applied after exposition of the larvae to the parasitoid. The efficiency of O. sokolowskii was negatively influenced by the presence of the fungi, mainly when the fungi were applied 24h before diamondback's larvae were exposed to the parasitoid. The association of the fungi with the parasitoid presents potential to be tested in field. The use of these natural enemies in the integrated management of P Xylostella may economically improve the cabbage productive system, especially for organic farming.

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Interaction of Metarhizium anisopliae (Metsch.) Sorok., Beauveria bassiana (Bals.) Vuill. and the parasitoid Oomyzus sokolowskii (Kurdjumov) (Hymenoptera: Eulophidae) with larvae of diamondback moth, Plutella xylostella (L.) (Lepidoptera: Plutellidae). Neotropical Entomology 35(2): 241-245, 2007

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