Factors affecting the attack rate of Bemisia tabaci on cucumber

Pesquisa Agropecuária Brasileira

Germano Leão Demolin Leite²  Marcelo Picanço¹  Raul Narciso Carvalho Guedes¹  Carvalho Carlos Ecole¹ 

[1] ,Universidade Federal de Minas Gerais Núcleo de Ciências Agrárias Dep. de AgropecuáriaMontes Claros MG

关键词: Cucumis sativus;    whitefly;    allelochemicals;    nitrogen;    trichomes;    Cucumis sativus;    mosca-branca;    aleloquímicos;    nitrogênio;    tricomas;   

DOI  :  10.1590/S0100-204X2006000800005

来源: SciELO

【 摘 要 】

The objective of this work was to determine the effects of rainfall, temperature, predators, parasitoids, plant age, leaf chemical composition, levels of leaf nitrogen and potassium, besides density of leaf trichomes, on attack intensity of Bemisia tabaci biotype B on the Cucumis sativus. An increase in the number of whitefly adults and nymphs per leaf was observed with plant aging. A higher number of whitefly adults per leaf and eggs cm-2 was verified in the apical part than in the middle and bottom part of the plants canopy. However, the higher number of whitefly nymphs was observed in the mid-part than in the apical and bottom part of the plant canopy. The incidence of whitefly nymphs was negatively affected with foliar nitrogen. Pentacosane and octacosane positively affected whitefly adults and the first compound also affected the nymphs of this pest species.

【 授权许可】

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