Be Ready for Weed Escapes Peanut Notes No. 62 2019
Many peanut fields appear to be weed free. While this is due in part to PPI/PRE herbicides it is also due in part to dry soils that have limited weed emergence. While it depends on the herbicide, effectiveness of many of the PRE herbicides decreases the longer they sit on the soil surface without activation. Some are degraded by UV light for example. All this to say when we do get rain I would anticipate very little control from PRE herbicides that have been in place since planting. Be ready to control weed escapes in a timely manner. Mixtures of contact and residual herbicides will be needed in many fields.