Alternate Strategies for Insect Control and Resistance Management: Possibilities and Future Prospects

Frederick W. Plapp


 
ABSTRACT

Pyrethroid resistance continues to be an important consideration in the management of tobacco budworm populations in cotton, but in most areas the overall frequency of resistance has not increased in recent years. In 1992 resistance to organophosphate, carbamate and cyclodiene insecticides was documented in adult males in several states, indicating the presence of target site resistance. The seasonal pattern of resistance was similar to that with pyrethroids in that resistance frequencies declined late in the season after insecticide use was suspended. Based on 1992 data, a new strategy is proposed for insecticide management in the presence of multiple types of resistance. The strategy emphasizes appropriate crop management techniques and early season use of low doses of Bacillus thuringiensis for Heliothis control. Later, low (ovicidal) rates of a nonpyrethroid insecticide can be added and midseason, low rates of pyrethroids can be added to the mixture. Adult monitoring can be employed to determine if resistance occurs and if it does, a third type of insecticide can be substituted for the component to which resistance is most severe. The purpose of using low dose mixtures of insecticides is to decrease selection for resistance to any insecticide type, thereby stabilizing pest management on a season long basis.



Reprinted from 1993 Proceedings Beltwide Cotton Conferences pp. 698 - 701
©National Cotton Council, Memphis TN

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Document last modified Sunday, Dec 6 1998