Persistence of Ovicidal Activity of Selected Insecticides Against Tobacco Budworm

B.R. Leonard, J. B. Graves, and A.M. Pavloff


 
ABSTRACT

Small plots of cotton naturally infested with tobacco budworm eggs were treated with selected insecticides alone and in binary mixtures. All treatments were effective ovicides based on percent mortality across all sample periods. Thiodicarb, amitrazr chlordimeform, fenoxycarb and profenofos (0.25 and 0.6, 0.25, 0.25., 0.25, and 1.0 lb AI/acre, respectively) demonstrated consistent ovo-larvicidal activity (ovicidal and 'larvicidal' mortality) significantly different from the untreated check at each sample period (2, 24 and 48-H posttreatment). Binary mixtures of thiodicarb (0.25 lb AI/acre) + profenofos (1.0 lb AI/acre) or cypermethrin (0.06 lb AI/acre) also demonstrated significantly higher total mortality than the untreated check at all three sample periods. No synergistic activity was observed in the treatment combinations. Results of the present study indicate that amitraz, thiodicarb, and fenoxycarb may be alternative ovicides to chlordimeform.



Reprinted from 1988 Proceedings: Beltwide Cotton Production Research Conferences pp. 268 - 272
©National Cotton Council, Memphis TN

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Document last modified Sunday, Dec 6 1998