Three cotton, Gossypium hirsutum L., cultivars and the cotton relative, G. thurberi, were evaluated in the field, during 2001 and 2002, for susceptibility to infestation by the silverleaf whitefly, Bemisia argentifolii Bellows and Perring, in Imperial Valley, CA. The upland cotton cultivars included DP 5415, Siokra L23 and Stoneville 474.Entries were evaluated for colonization by silverleaf whitefly as numbers of adult, eggs and nymphs. In the field studies, G. thurberi had very low numbers whitefly adults, eggs and nymphs, followed by Siokra L23, DP 5415 and Stoneville 474. In contrast, in greenhouse studies on potted plants, silverleaf whitefly had higher nymphal survival and shorter development time on G. thurberi compared to DP 5415. Further studies were conducted in 2003 to determine why G. thurberi is so resistant to silverleaf whitefly in the field, while it is more susceptible than commercial cotton when tested as potted seedlings in the greenhouse.
Species 1: Homoptera Aleyrodidae Bemisia argentifolii (silverleaf whitefly)
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