Characterization of antibiosis and antixenosis to the whitefly silverleaf <Emphasis Type="Italic">Bemisia tabaci</Emphasis> B biotype (Hemiptera: Aleyrodidae) in several squash varieties |
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Authors: | Edson Luiz Lopes Baldin Ronaldo Antonio Beneduzzi |
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Institution: | 1.Department of Plant Production, Faculty of Agronomic Sciences,UNESP—Univ Estadual Paulista,Botucatu,Brazil;2.Department of Entomology, Faculty of Agronomic Sciences,Camilo Castelo Branco University,Fernandópolis,Brazil |
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Abstract: | The objective of this study was to investigate the potential resistance mechanisms to Bemisia tabaci (Gennadius) (Hemiptera: Aleyrodidae) B biotype, in eight Cucurbita pepo varieties. Attractivity, oviposition preference, and nymphal development were evaluated under greenhouse and laboratory conditions.
Variety Bianca was the least attractive to adult whiteflies in multi-choice tests. The whiteflies showed oviposition nonpreference
(antixenosis) for Novita Plus, Bianca and Sandy in multi-choice test, and similar results were observed in no-choice tests
with varieties Bianca, Novita, Caserta Cac and Sandy. Sandy expressed high antibiosis levels against whitefly nymphs, leading
to 63.9% mortality. The high level of resistance in variety Sandy can serve as base for genetic improvement of C. pepo focusing on the development of resistant varieties to B. tabaci B biotype. |
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