Author: Larry Steckel, Extension Weed Specialist
The very wet May has led to rapid degradation of the PRE applied herbicides in cotton. In our tests at Jackson that were planted 21 days ago all the PRE applied herbicides have broken. Some broke very quickly after application while others held on a little better, even with all the rain.
Relying on dicamba for residual pigweed control with all the wet weather did not pan out. It was very hard to distinguish the untreated checks from the dicamba PRE applied treatments. They were both jail breaks.