Atratividade e não-preferência para oviposição de Bemisia tabaci (Genn.) biótipo B (Hemiptera: Aleyrodidae) em genótipos de feijoeiro

Abstract

-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 G13028 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.

Resistance of sugarcane cultivars to Mahanarva fimbriolata

“…A correlation between adult attractiveness and oviposition preference has also been observed in others insect species, such Bemisia tabaci (Genn.) biotype B (Hemiptera: Aleyrodidae) toward different soybean (Valle and Lourenção 2002), bean (Oriani et al 2005) and cowpea genotypes (Cruz et al 2012).…”

Influência dos tricomas na preferência para oviposição de Bemisia tabaci (Genn.) biótipo B (Hemiptera: Aleyrodidae) em genótipos de feijoeiro

“…entre os menos preferidos podem-se relacionar G13028, G11025C, IAPAR MD808, G23425E e Arc 5s (médias variando de 1,1 a 1,5 ovos/cm 2 ), valores estes que diferiram significativamente dos constatados na cultivar Bolinha (Tabela 2). Oriani et al (2005) também observaram que o genótipo selvagem G13028 mostrou-se altamente não-preferido para oviposição por B. tabaci biótipo B, em ensaios com e sem chance de escolha (0,9 e 1,0 ovos/cm 2 , respectivamente). Citaram também como resistentes à mosca-branca, em ensaios com e sem chance de escolha, os genótipos Arc 3s (0,9 e 1,0 ovos/cm 2 , respectivamente), Arc 5s (1,1 e 1,3 ovos/cm 2 , respectivamente) e G11056 (2,4 e 1,1 ovos/cm 2 , respectivamente); já o genótipo Bolinha (7,9 e 2,2 ovos/cm 2 , respectivamente) mostrou-se altamente suscetível.…”

Atracción de adultos y preferencia de oviposición de mosquita blanca (Bemisia tabaci) en genotipos de Capsicum annuum

“…El índice de preferencia de oviposición (IPO) se obtuvo de acuerdo a la fórmula propuesta por Oriani et al (2005):…”