Abstract
Field experiments were conducted in North Carolina during 1960 to determine if low dosages of insecticidal seed-treatments would control certain cotton insects without delaying the fruiting of cotton. Phorate was applied to Coker 100A cottonseed at dosages of 0.5, 0.25, and 0.125 Ib/bu and RP 9599 ( N -methyl ( O, O -diethyldithiophosphosphoryl)-5 thia-3 methyl-2 valeramide) and RP 9349 ( N -methyl ( O, O -diethyldithiophosphoryl)-5 thia-3 valeramide) were applied at 0.25 1b/bu. With the exception of RP 9599 against the cotton aphid, Aphis gosspii Glover, and A. craccivora Koch, all treatments controlled infestations of these aphids and thrips, Frankliniella spp., from plant emergence to the 8-leaf stage of growth. However, all treatments failed to control aphids during the first 2 weeks of flowering. Delayed fruiting and reduced yields were associated with RP 9599 and the phorate seed-treatments but not with RP 9349.
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