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Tolerance of Cotton to Flumioxazin (Valor)

William K. Vencill and Jason A. Ferrell

ABSTRACT

Field and laboratory studies were conducted to examine cotton tolerance to flumioxazin application with various adjuvants, nozzle tips, and placement on the cotton plant. There were no differences in the various glyphosate formulations tank-mixed with flumioxazin. None exceeded 5% cotton injury7 or 20 DAT. Weed control was better from the tank-mixes than with flumioxazin applied alone. No differences were observed amongst the various glyphosate formulations tank-mixed with flumioxazin. Seed cotton yields were higher with all combinations than with no treatment. Flood jet nozzles tended to cause more injury early, but by 30 days after treatment no differences in weed control or injury were observed. Differences in weed control and seed cotton yield were not observed. None of the adjuvants applied with flumioxazin caused greater than 10% cotton injury 7 or 14 DAT. Differences in weed control and seed cotton yield were not observed amongst the adjuvants used. The uptake study indicated that flumioxazin penetration through bark tissue was minimal and was significantly lower than flumioxazin penetration through green tissue. Translocation of flumioxazin from application to bark tissue was not observed due to lack of movement across the epidermal layer. Translcoation of flumioxazin was observed from application to green tissue.





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Document last modified April 16, 2003