Abstract
When chemical and microbial insecticides were evaluated in replicated small-plot field tests on cotton at Stoneville, MS, in 1975-77, differences in control of Heliothis spp. and resultant yields reflected the infestation pressure. With heavy infestations, the synthetic pyrethroids, permethrin and fenvalerate, and a new carbamate, UC-51762 (dimethyl N,N’-[thiobis [(methylamino) carbonyloxy]] bisethanimidothioate), gave the most effective control and the greatest increases in yield compared with untreated checks. The biological inseticides, Bacillus thuringiensis Berliner, Baculovirus heliothis, a looper (Autographa) NPV, and Nomuraea rileyi (Farlow) Samson were ineffective as a group and, in some cases, no more effective than no treatment. The organophosphate materials, either the standards or new materials, were intermediate in effectiveness between the synthetic pyrethroids and the biological insecticides.
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