Status of Insecticide Resistance in Tobacco Budworm and Bollworm in Louisiana

J.B. Graves, B.R. Leonard, E. Burris, S. Micinski, S.H. Martin, C.A. White and J.L. Baldwin


Over 4100 male tobacco budworm moths were bioassayed for pyrethroid resistance from May through September 1993 against 10 or 30 µg doses of cypermethrin utilizing the adult vial test. Average pyrethroid resistance levels during all months of 1993 except August were higher than previously recorded (1987-1992). Also 854, 595 and 440 male tobacco budworm moths were bioassayed for resistance to profenofos, methomyl and endosulfan using the adult vial test. Although the discriminating doses of profenofos, methomyl and endosulfan selected for these bioassays remain questionable, resistance to all three classes of chemicals was evident. Thus resistance was documented to representative chemicals from the four classes of insecticides (carbamates, organochlorines, organophosphates and pyrethroids) primarily used to control tobacco budworms on cotton in the United States. Tobacco budworm population pressure was generally light to moderate in Louisiana during 1993. As a result, few tobacco budworm field control failures occurred although control in most fields was not satisfactory. Over 1700 male bollworm moths were bioassayed against 1,2, or 5 µg/vial doses of cypermethrin. Data from these bioassays were similar to that obtained in 1988-1992 and indicate that bollworms remain susceptible to pyrethroids.

Reprinted from Proceedings of the 1994 Beltwide Cotton Conferences pp. 769 - 774
©National Cotton Council, Memphis TN

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Document last modified Sunday, Dec 6 1998