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Silverleaf Whitefly Resistance in the Cotton Relative, Gossypium thurberi

E.T. Natwick and G.P. Walker


ABSTRACT

Three cotton, Gossypium hirsutum L., cultivars and the cotton relative, G. thurberi, were evaluated in the field for resistance to the silverleaf whitefly, Bemisia argentifolii Bellows and Perring, in Imperial Valley, CA. The cultivars were DP 5415, Siokra L23 and Stoneville 474. Trial entries were evaluated for colonization by silverleaf whitefly as numbers of adult, eggs, and nymphs. In the field trial,G. thurberi was favored by silverleaf whitefly on potted green house grown seedlings over upland cotton entries. In field trials, G. thurberi had very low numbers whitefly adults eggs and nymphs, followed by Siokra L23, DP 5415 and Stoneville 474. In contrast, in a greenhouse trial on potted seedlings, silverleaf whitefly had higher nymphal survival and shorter development time on G. thurberi compared to DP 5415. Further studies are needed to determine why G. thurberi is so resistant to silverleaf whitefly resistance in the field, while it is more susceptible than commercial cotton when tested as potted seedlings in the greenhouse.





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Document last modified May 20, 2002