Been seeing some annual morningglory in peanuts. UGA Extension Weed Scientist Dr. Eric Prostko has this to say about control:
In most cases, it is too late in the year to legally apply herbicides. Pre-harvest intervals (PHI) of peanut herbicides with POST activity on annual morningglory are as follows: Cadre = 90 days; Cobra = 45 days; Ultra Blazer = 75 days; 2,4-DB = 45-60 days. In my opinion, the best thing a grower can do for annual morningglory (now) is to apply a pre-harvest application of either Aim or ET (i.e. 7 days before digging). Both herbicides will provide sufficient dessication of annual morningglory plants (except smallflower) to improve peanut vine flow through a digger with minimal effect on the peanuts. It is very important that the peanuts be dug in 7 days after treatment (or as soon as possible after that time). If digging is delayed, the morningglory vines could start to recover/regrow especially after a rainfall event.
Thomas County Ag 