Adult attractiveness and oviposition preference of Bemisia tabaci (Genn.) (Homoptera: Aleyrodidae) B-biotype in cotton genotypes

Abstract

The silverleaf whitefly Bemisia tabaci B-biotype is an important pest of cotton; it affects plant vigour, transmits geminivirus and reduces lint quality. In order to evaluate the resistance of cotton genotypes, Gossypium hirsutum (L.), to the whitefly Bemisia tabaci B-biotype, both free-choice and nochoice attractiveness and non-preference for oviposition tests were carried out in a shade house, at room temperature. Low attractiveness to adults of this whitefly was observed for plants of genotypes Fabrika, CNPA Ita 90, Makina, Coodetec 407, and IAC 01-639 CPA 02-24, which may represent a resistance component of these genetic materials to the insect. Genotypes BRS Aroeira, Coodetec 406, Fabrika, and Coodetec 401 presented the non-preference-for-oviposition type of resistance in the free-choice and nochoice tests. The numbers of trichomes and gossypol glands per cm 2 were not suitable to evaluate nonpreference for oviposition of whitefly adults on cotton genotypes. Keywords: Gossypium hirsutum L., Aleyrodidae, insecta, silverleaf whitefly, host plant resistance ATRATIVIDADE DE ADULTOS E PREFERÊNCIA PARA OVIPOSIÇÃO DE Bemisia tabaci (GENN.) (Homoptera: Aleyrodidae) BIÓTIPO B EM GENÓTIPOS DE ALGODOEIRORESUMO: Considerada importante praga do algodoeiro, a mosca-branca Bemisia tabaci biótipo B pode através de sua alimentação, diminuir o vigor das plantas, trasmitir vírus e prejudicar a qualidade da fibra. Visando avaliar a resistência de genótipos de algodoeiro, Gossypium hirsutum (L.), à mosca-branca Bemisia tabaci biótipo B, realizaram-se testes de atratividade e não-preferência para oviposição, com e sem chance de escolha, em telado, a temperatura ambiente. Verificou-se baixa atratividade das plantas dos genótipos Fabrika, CNPA Ita 90, Makina, Coodetec 407 e IAC 01-639 CPA 02-24 a adultos dessa mosca-branca, o que pode representar um componente de resistência destes materiais genéticos ao inseto. Os genótipos BRS Aroeira, Coodetec 406, Fabrika e Coodetec 401 apresentaram resistência do tipo não-preferência para oviposição, nos testes com e sem chance de escolha. Os números de tricomas e de glândulas de gossipol por cm 2 não foram adequados para se avaliar a não-preferência para oviposição de adultos da mosca-branca em genótipos de algodoeiro. Palavras-chave: Gossypium hirsutum L., Aleyrodidae, insecta, mosca-branca, resistência de plantas a insetos

Resistance of Manihot esculenta and its intraspecific hybrids to the whitefly Aleurothrixus aepim (Hemiptera: Aleyrodidae)

“…Some studies have shown that there is not always a correlation between the number of trichomes and the number of eggs oviposited by whiteflies. Prado et al (2015), who evaluated Bemisia tabaci infestation on a cotton crop, observed a negative correlation; however, for the same crop, there have also been cases where no correlation was found between these two variables (Boiça Jr. et al, 2007;Torres et al, 2007). Although there were differences for the density of trichomes on the leaves of the Manihot genotypes, this did not influence the number of eggs oviposited by A. aepim (the Spearman's correlation coefficient was not significant, at 5% probability, by the t test = -0,1515).…”

Identification of Capsicum accessions tolerant to Tomato severe rugose virus and resistant to Bemisia tabaci Middle East-Asia Minor 1 (MEAM1)

“…Free-choice is a preference test to identify presence of attractants and/or repellents (Emden 2002). It is well-documented that B. tabaci is affected mainly by the external/physical characteristic of the leaf surface, such as hairiness, glandular trichomes, leaf shape and cuticle thickness, which prevent the insect stylet from reaching the phloem (Boiça Júnior et al 2007;Oriani and Vendramim 2010;Ballina-Gómez et al 2013). Type IV glandular trichomes and associated acylsucroses present on the abaxial leaf surface of ABL 14-8 tomato plants alter the settling behavior and early probing activities of B. tabaci (Rodríguez-López et al 2012).…”

BIOLOGICAL CONTROL OF WHITEFLY BY SPECIES OF LADYBUG Delphastus spp.

“…Every crop requires specific management planning based on the particularities of the attacking insect and its phenological characteristics (TOSCANO et al, 2003;BOIÇA JR. et al, 2007), which makes factors such as crop monitoring, sampling, correct identification of pests and natural enemies, and the action levels of each culture indispensable for successful management (MOURA et al, 2013).…”