Journal
JOURNAL OF PEST SCIENCE
Volume 83, Issue 3, Pages 221-227Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s10340-010-0289-2
Keywords
Cucurbita pepo; Host plant resistance; Aleyrodidae; Nonpreference; Antibiosis
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Funding
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP)
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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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