Use of Low Dose Mixtures of Pyrethroids and Organophosphates for the Control of Tobacco Budworm, Heliothis virescens (F.)

D.A. Kostroun and F.W. Plapp, Jr.


 
ABSTRACT

Field and laboratory tests were conducted to determine the toxicity of profenofos/cyhalothrin mixtures to larvae of the tobacco budworm, Heliothis virescens (F.). With susceptible larvae, field data demonstrated that half rate mixtures of profenofos and cyhalothrin provided approximately equal control to full rates of each compound separately. With resistant larvae, the half rate mixture worked as well as the full rate of profenofos and much better than the full rate of cyhalothrin. Overall, the half rate mixture was more effective against susceptible than resistant larvae suggesting that low rate mixtures should be used before a resistance problem arises not afterward. Cotoxicity values obtained from laboratory bioassays with each insecticide alone and in combination indicate that profenofos and cyhalothrinare acting independently in the mixture. Field resistance monitoring tests indicated less selection for resistance in an area where low rate mixtures of profenofos and a pyrethroid were used as compared to areas where the insecticides were used alone at full rates. The data suggest that mixtures of profenofos and pyrethroids at low rates will achieve control comparable to full rates of either insecticide alone, will do so with less selection for resistance, and should be used before resistance problems occur.



Reprinted from 1993 Proceedings Beltwide Cotton Conferences pp. 778 - 780
©National Cotton Council, Memphis TN

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Document last modified Sunday, Dec 6 1998