Fluometuron at 1.1 kg ai/ha was applied postemergence (over-the-top) to cotton in the V3 to V4 stage to determine effects on flower and boll production, yield, and fiber quality. Treated plants produced more bolls but boll weight was reduced. Lint yield was not affected. Flower and boll production during the first 2 weeks of flowering were reduced, but treated plants produced more flowers and bolls during mid- and late bloom. A delay in sympodia development delayed development of fruiting structures. Fluometuron treatment promoted sympodia development on monopodia at nodes three and four. Fiber micronaire was reduced in 1 of 2 yr. Fiber strength, length, and length uniformity were not affected.

Disulfoton and phorate applied in the seed furrow greatly reduce clomazone phytotoxicity to cotton in the field, whereas aldicarb does not. An experiment was conducted to determine the effect of aldicarb, disulfoton, and phorate on 14C-clomazone absorption, translocation, and metabolism by cotton grown in a sandy loam soil. Clomazone at 0.87 μg g−1 of soil alone or in combination with aldicarb at 0.6 μg g−1 of soil reduced cotton root and shoot growth 26 to 33%. Root and shoot growth were not reduced by clomazone plus disulfoton or phorate at 0.6 μg g−1 of soil. Protection of cotton against injury by clomazone was not explained by reduced absorption or translocation of clomazone or a metabolite to the shoot. Clomazone metabolism was reduced by disulfoton and phorate, thus indicating a clomazone metabolite may be more toxic to cotton.