Cotton Harvest Aid Trial and Defoliation


I’ve included the 6 and 11 days after treatment (DAT) ratings for the cotton harvest aid study for Wharton, Texas. The initial treatment was made on August 20, and the second on September 2, 2021. The cotton harvest aid study for this site was conducted on a field of Phytogen 332 planted on March 21, 2021. If you are having trouble viewing the results, a larger version can be found here.

Defoliation Test Plot
Kate Crumley

2021 Cotton Harvest Aid Trial- Wharton County

Cooperator: Josh Marek

Kate Crumley, Extension Agent IPM- Wharton, Jackson, Matagorda Counties

Corrie Bowen, County Extension Agent, AG/NR Wharton County

Dr. Benjamin McKnight, State Extension Cotton Specialist

Dale Mott, Extension Program Specialist

Cotton variety is Phytogen 332 W3FE, planted on March 21, 2021

First application (App Timing A) was made on August 20, 2021. Ratings were taken on August 26, 2021.

Second application (App Timing B) was made on August 26, 2021. Ratings were taken on September 1, 2021

Trade names of commercial products used in this report are included only for better understanding and clarity. Reference to commercial products or trade names is made with the understanding that no discrimination is intended and no endorsement by the Texas A&M Agrilife Extension Service and the Texas A&M University System is implied. Readers should realize that results from one experiment do not represent conclusive evidence that the same response would occur where conditions vary.

For more information, here are links to a defoliation guide from the Texas Row Crop Newsletter, the 2019 Mid South Defoliation Guide, and the Wharton county defoliation test results from 2017. As always, if you have any questions feel free to call or send me an email. Have a wonderful labor day weekend, and happy harvesting, everyone!


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