The effects of chlordimeform, [N'-(4 chloro-O-toly)-N,N-dimethyl-formamidine), on cotton (Gossypium hirsutum L.) cultivars were studied under field conditions in 1983 and 1984 at Mississippi State, MS. Chlordimeform was applied, alone and combination with a pyrethroid. Cultivars varying in earliness and sensitivity to plant bugs, Lygus lineolaris (Palisat de Beauvais) were evaluated in subplots, with two planting dates each year. Conclusions involving reaction to plant bugs were limited by the relatively small plot size.

Compared to the untreated check, chlordimeform as an early season yield enhancement treatment was associated with increased yields " early plantings but not in late plantings. The absence of significant cultivar by treatment interactions and the lack of consistent enhanced early boll retention rates suggest that the effects of chlordimeform was not simply insect control.