# Foliar Auxin Injury Not Good Indicator of Yield Loss

Author: Jim Steadman
Published: 2017-05-01
Canonical URL: https://www.cottongrower.com/crop-inputs/weed-management/foliar-injury-from-auxins-not-good-indicator-of-yield-loss/

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Cotton injury from auxin herbicide drift and potential yield loss have been on growers’ minds recently as planters go to the fields.

According to a recent article authored by Texas A&M AgriLife Extension and Oklahoma State cotton and weed specialists, the relationship between injury from dicamba or 2,4-D and potential yield loss is a complex issue, and a definite answer to “How much yield will I lose?” is difficult, if not impossible, to accurately predict.

According to the specialists, many factors play a role in cotton’s yield response after exposure to dicamba and 2,4-D, including growth stage at time of exposure, rate/concentration of herbicide, degree of exposure, and environmental conditions after exposure.

The complete article is [available here](http://agrilife.org/texasrowcrops/2017/04/28/foliar-injury-symptoms-from-auxin-herbicides-are-not-a-good-indicator-of-cotton-yield-loss/), including tables illustrating the range of injury estimates and yield loss results of studies evaluating drift rates of dicamba and 2,4-D on cotton in South Texas and the Texas High Plains; pictures illustrating examples of visual injury symptoms from sub-lethal applications of 2,4-D and dicamba at various growth stages; and the corresponding range of injury ratings.