Response of Cotton and Cotton Pests to Thimet Seed-Treatment1

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Abstract
Coker 100W cottonseed treated with Thimet® (O,O-diethyl S-(ethylthio) methyl phosphorodithioate) was evaluated in replicated field tests at four widely separated locations in North Carolina during 1955-56. Thimet exhibited pronounced effects both upon the cotton plant and pests which attack cotton. Thimet seed-treatments were particularly effective in controlling thrips, Frankliniella fusca (Hinds), F. exigua Hood, F. tritici (Fitch), Thrips tabaci Lind., and the cotton aphid, Aphis gossypii Glov., until the time of squaring. This material afforded seasonal protection from spider mites, Telranychus cimabarinus (Bois.) and T. tearius (L.). Thimet was partially effective in reducing( boll weevil, Anthonomus grandis Boh., infestations throughout the season, but the use of this material favored the development of bollworm, Heliothis zea(Boddie), and tobacco budworm, II virescens (F.), infestations. Delayed fruiting of cotton appeared to be the most detrimental characteristic associated with the use of Thimet. However, certain adverse effects upon the germination, emergence, and vegetative growth of cotton were also noted.