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Susceptibility of Selected Beneficial Insects to Dpx-mp062

P. G. Tillman, J. E. Mulrooney and W. Mitchell


Effects of DPX-MP062 (Steward® in cotton, Du Pont Agricultural Products, Wilmington, DE) on survival of five natural enemies, Cardiochiles nigriceps, Coccinella septempunctata, Geocoris punctipes, Microplitis croceipes, and Cotesia marginiventris were determined. For C. nigriceps, C. septempunctata, and G. punctipes, treatment by Steward® at the lower rates (0.045-0.065 lb ai/a) resulted in high to moderately high survival when sprayed directly onto the insects. The highest rate of Steward® was very toxic to C. marginiventris and G. punctipes. Except for C. marginiventris, the lower rates (0.045-0.065 lb ai/a) of Steward® were much less toxic than Karate®. Survival of C. marginiventris and G. punctipes was high after 24 h of exposure to residues of Steward® on cotton leaves. Exposure to Steward® residues on cotton leaves at 0 and 24 hours after treatment in the field did not effect survival of C. nigriceps, C. septempunctata, G. punctipes, or M. croceipes.

Reprinted from Proceedings of the 1998 Beltwide Cotton Conferences pp. 1112 - 1114
©National Cotton Council, Memphis TN

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Document last modified Sunday, Dec 6 1998