Mark VanGessel, Extension Weed Specialist; mjv@udel.edu Be sure to scout your planted fields to determine if and when a postemergence treatment is necessary. Under good conditions, postemergence treatments are typically needed four to five weeks after the preemergence herbicides were… Continue Reading
Mark VanGessel, Extension Weed Specialist; mjv@udel.edu I have seen Palmer amaranth seedlings emerging in corn fields that had no preemergence herbicides applied. There are Palmer amaranth plants in DE and MD that are resistant to glyphosate and ALS herbicides (Group… Continue Reading
Mark VanGessel, Extension Weed Specialist; mjv@udel.edu If Palmer amaranth is a weed in your fields or in close proximity, you need to plan on using a soil-applied herbicide. But that alone is not enough. You also need to: Apply those… Continue Reading
Mark VanGessel, Extension Weed Specialist; mjv@udel.edu Palmer amaranth is a dioecious species, meaning a plant will produce either male or female flowers. The female flowers are fertilized with wind-dispersed pollen from the male plants. And Palmer amaranth is very effective… Continue Reading
