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Status of Insecticide Resistance in Tobacco Budworm and Bollworm in Louisiana During 1999

R. D. Bagwell, D. C. Cook, J. J. Adamczyk, B. R. Leonard and S. Micinski


 
ABSTRACT

In 1999, resistance was again documented in tobacco budworm populations to pyrethroid insecticides. Over 509 tobacco budworm moths were bioassayed for pyrethroid resistance from May through August 1999 using a discriminating dose of 10 g in the adult vial test. Pyrethroid resistance levels in 1999 were the highest monitored. Percent survival in May, June, July and August was 46, 64, 53, and 58%, respectively. The high survival level in May and June indicates that a large percentage of the tobacco budworm population was resistant to pyrethroids before growers began to use pyrethroids for tobacco budworm control. The data indicates that pyrethroids no longer provide effective control of tobacco budworm populations. Over 809 male bollworm moths were assayed against a 5 g/vial dose of cypermethrin. Bollworm moth survival levels were similar to 1998 levels. Percent survival in May, June, July and August was 18, 13, 15 and 16%, respectively. This data indicates that bollworm susceptibility to pyrethroid insecticides is changing.



Reprinted from Proceedings of the 2000 Beltwide Cotton Conferences pp. 914 - 918
©National Cotton Council, Memphis TN

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Document last modified Saturday, Jun 17 2000