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Atractiveness and oviposition nonpreference of Bemisia tabaci Genn biotype B Hemiptera Aleyrodidae for bean genotypes Atratividade e nao-preferencia para oviposicao de Bemisia tabaci Genn biotipo B Hemiptera Aleyrodidae em genotipos de feijoeirow


Atractiveness and oviposition nonpreference of Bemisia tabaci Genn biotype B Hemiptera Aleyrodidae for bean genotypes Atratividade e nao-preferencia para oviposicao de Bemisia tabaci Genn biotipo B Hemiptera Aleyrodidae em genotipos de feijoeirow



Neotropical Entomology 34(1): 105-111



ISSN/ISBN: 1519-566X

Whitefly is one of the most harmful pests that attack bean crops, mainly for extracting large quantities of phloem sap and transmitting the bean golden mosaic virus. Resistant germoplasm plants can be an important method for controlling this pest. The oviposition preference of Bemisia tabaci biotype B for 20 bean genotypes was tested. In a free-choice test, the genotypes were divided into two plots of 10 replicates. The bean plant pots were set up in a randomized design in a cage (80 x 50 x 50 cm) covered by nylon netting and infested with 1.000 adults during four days. No-choice test was carried out with 20 replicates where one newly expanded leaflet from bred genotypes and cultivars or one leaf from wild genotypes, was placed in a cage infested by 25 pairs of whiteflies during 48h. In freechoice tests, the genotypes G13028, Arc 5s, Arc 1s, G11056, Arc 3s presented the smaller oviposition and preference index, varying from -91.9 to -78.6, while Arc 1 (+33.0) had greater index. In no-choice tests, smaller number of eggs/leaflet were observed in genotypes G13028 (28.2), Arc 3s (37.6) and G23425E (39.0), whereas the most preferred had 105.0 eggs/leaflet (Bolinha). The wild genotype G 13028 was highly resistant (oviposition nonpreference) toward B. tabaci B biotype. The wild genotypes Arc 3s, Arc 5s and G11056 were also resistant. The Bolinha, Arc 1 and Arc 4 genotypes were highly susceptible to whitefly oviposition.

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