Pesquisa Agropecuária Brasileira (2006) 41, 1241-1245

Germano Leão Demolin Leite, Marcelo Picanço, Raul Narciso Carvalho Guedes and Carvalho Carlos Ecole (2006)
Factors affecting the attack rate of Bemisia tabaci on cucumber
Pesquisa Agropecuária Brasileira 41 (8), 1241-1245
Abstract: 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.
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Database assignments for author(s): Marcelo Coutinho Picanco

Research topic(s) for pests/diseases/weeds:
environment - cropping system/rotation
population dynamics/ epidemiology

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Bemisia tabaci biotype MEAM1	Cucumber (Cucumis sativus)	Brazil (south)