From Weekly Crop Update
Mark VanGessel, Extension Weed Specialist; mjv@udel.edu
Some fields were sprayed last spring with Osprey for control of annual ryegrass and there was no control. At least one of these fields was confirmed as having ALS-resistant annual ryegrass. If Osprey or PowerFlex (another ALS-herbicide or Group 2 herbicide), were used for annual ryegrass but did not control them, Axial XL is the only option for ryegrass control this spring.
More fields with ALS-resistant common chickweed (resistant to Finesse, Harmony Extra, Osprey, and PowerFlex) are showing up in Delaware. Spring application of Starane Ultra is the best option to suppress/control the resistant chickweed. [Read more…]