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Factors Contributing to Late-Season Cotton Aphid Infestations

J. E. Slosser and M. N. Parajulee


 
ABSTRACT

The development of cotton aphid, Aphis gossypii Glover, populations in relation to irrigation management and application of insecticides was investigated in 1998 and 1999. Three water management treatments included no irrigation (dryland), irrigation termination by mid-August, and irrigation termination in late August. Three chemical treatments, within each of the three water management treatments, were the untreated check, application of cyhalothrin which is known to stimulate aphid population increase, and cyhalothrin followed by the aphicide pymetrozine. There was only one population peak in early September, 1998 and one in late September, 1999. An application of cyhalothrin combined with late irrigation in August resulted in very high aphid population levels during September in both years. Pymetrozine effectively reduced aphid numbers following the cyhalothrin treatment in dryland and irrigated, early termination treatments, but pymetrozine was less effective in irrigated, late termination treatments.





Reprinted from Proceedings of the 2001 Beltwide Cotton Conferences pp. 955 - 957
©National Cotton Council, Memphis TN

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Document last modified XXXXXX, XXX XX 2001