Mark VanGessel, Extension Weed Specialist; mjv@udel.edu Weed emergence of summer annual weeds has begun. Common ragweed seedlings began to peek through last week and plenty more coming through this week. Common ragweed is one that starts early, along with common… Continue Reading
Mark VanGessel, Extension Weed Specialist; mjv@udel.edu On June 8, EPA issued a ruling to allow use of existing stocks of dicamba on soybeans. Read DE Department of Agriculture press release here https://news.delaware.gov/2020/06/09/delaware-growers-allowed-to-use-up-existing-dicamba-stock/. Dicamba that was in the possession of commercial… Continue Reading
Mark VanGessel, Extension Weed Specialist; mjv@udel.edu and Frank D’Amico Some common ragweed in the region (DE, MD, and NJ) have evolved resistance to glyphosate, PPO-herbicides (Group 14), and ALS-herbicides (Group 2). Some populations are resistant only to glyphosate, others are… Continue Reading
Mark VanGessel, Extension Weed Specialist; mjv@udel.edu FYI, common ragweed and Palmer amaranth are emerged in many of the fields that have not been treated yet. So, if you have glyphosate-resistant biotypes you will need to be sure to have products… Continue Reading
Mark VanGessel, Extension Weed Specialist; mjv@udel.edu Glyphosate-resistant horseweed, Palmer amaranth, and common ragweed have all been identified in Delaware. In addition, many fields have plants of these species resistant to Group 2 herbicides; AND a few fields in the region… Continue Reading
