Some of the samples are showing the injury after an application of a glyphosate product without any tankmix partner. While we have routinely noted chlorotic leaves following glyphosate applications, this type of injury rarely results in dead leaf tissue. We will be collecting more information on this issue over the next couple of weeks to try to determine the cause. We have observed several corn samples with glyphosate drift damage and soybean with dicamba drift damage. Glyphosate symptomology on corn includes chlorotic bands on the leaves, chlorosis in the whorl, and small plants will turn purple as the symptoms progress.
Research results on glyphosate damage to corn are somewhat mixed.
Young corn is usually more sensitive, especially if it displays a noticeable height reduction. Environmental conditions following exposure will have a large impact on the ability to recover. Our experience has been that if height is not reduced and new corn leaf color is normal 3-4 weeks after exposure, detrimental yield effects will be minimal. Dicamba injury on beans is seen as cupped and puckered leaves. The overall number of drift complaints received thus far is not surprising since we seem to have had an inordinate amount of windy days this year due to the hot, dry, drought conditions, when sprayers likely should have been parked.