Effects of Triclopyr, Clopyralid, and Picloram on Growth and Production of Cotton
1990
Jacoby, Pete W. | Meadors, Cecil H. | Clark, Lewis E.
Posttreatment effects on growth, yield, and fiber quality of dryland cotton (Gossypium hirsutum L.) were measured after treatment with foliar sprays of picloram1 (4-amino-3,5,6-trichloro-2-pyridinecarboxylic acid), triclopyr {[(3,5,6-trichloro-2-pyridinyl)oxy]acetic acid}, and clopyralid (3,6-dichloro-2-pyridinecarboxylic acid) at 0.01, 0.05, 0.10, and 0.25 lb (a.i.)/acre. AH herbicides significantly reduced yields when applied at rates of 0.05 lb/acre or more to cotton in the prebloom growth stage. Yield reductions varied from 35 to 45%, with postbloom treatments of each herbicide at 0.10 lb/acre or more. Staple length was not greatly reduced by either picloram or triclopyr in prebloom applications but was lowered by postbloom treatments. Clopyralid reduced staple length at 0.25 lb/acre in 1988. Micronaire was generally reduced with increasing rates of all herbicides. Triclopyr was generally less injurious to younger cotton than the other two herbicides, while clopyralid reduced yields less than the others when applied to older cotton.
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