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Status of Insecticide Resistance in Tobacco Budworm and Bollworm in Louisiana During 1997

R. D. Bagwell, J. B. Graves, S. Micinski, B. R. Leonard and V. Mascarenhas


In 1997, resistance was again documented in tobacco budworm populations to pyrethroid insecticides. Over 745 tobacco budworm moths were bioassayed for pyrethroid resistance from May through August 1997 using a discriminating dose of 10 Fg in the adult vial test. Pyrethroid resistance levels were the highest documented since inception of monitoring in 1987. Percent survival in June was 51%. Previously, the highest level of survival observed in June between 1987 and 1996 had been 29%. This data indicates there was an increased use of pyrethroids in June 1997. Over 1821 male bollworm moths were assayed against a 5Fg/vial dose of cypermethrin. Bollworm moth survival levels continue to increase slowly. July survival levels were 14% , the highest observed since inception of monitoring in 1988. This data indicates that bollworm susceptibility to pyrethroid insecticides is changing.

Reprinted from Proceedings of the 1998 Beltwide Cotton Conferences pp. 1140 - 1145
©National Cotton Council, Memphis TN

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Document last modified Sunday, Dec 6 1998