Large plot studies of oxamyl (Vydates) at 0.125 lb. ai/ac and azinphosmethyl (Guthiong) at 0.25 lb. ai/ac for control of early season boll weevil were conducted in 1982. Materials were applied in water with each application approx. five days apart. Five applications were made starting at the late pin square stage of plant growth. One application was rained off. The field was historically highly infested, and the 1982 trap catch index predicted >50% damaged squares by F₁ generation, if left untreated. In summary, oxamyl was equal to azinphosmethyl for control of boll weevil, and superior to azinphosmethyl for fleahopper control. Oxamyl also has the added benefit of being less damaging to beneficial insects, especially coccinelids, and thereby increases natural control of bollworms and aphids.

In 1982, two large plot tests were conducted to study chlordimeform (Fundal^®) as a yield enhancer for South Texas dryland cotton. Chlordimeform was applied seven times at the rate of 0.125 lbs. ai/ac. One application was rained off. We found little difference in numbers of squares, blooms or green bolls produced during the season, although there was a tendency for chlordimeform treated plots to be earlier compared to the untreated check plots. In conclusion, we found chlordimeform increased the numbers of open bolls, earliness, and increased yields at first and total harvest. The average increase in yield for both locations was 13%, 68 lb. of lint per acre. Considering the very drouthy season, this was thought to be a good yield enhancement response.