Seminole Crop E News

Agricultural News for Farmers and Agribusiness in SW Georgia

Counter/Herbicide Interactions in Field Corn

Posted by romeethredge on March 1, 2013

It is very important to remember that if you want/need to use an in-furrow application of the insecticide/nematicide, Counter 20G, you cannot use certain herbicides.

Dr Eric Prostko, UGA Extension Weed Scientist, says this negative insecticide/herbicide interaction is more commonly associated with the ALS-inhibiting herbicides (Accent, Beacon, Steadfast Q) but can also occur with certain HPPD-inhibitors (Callisto, Halex GT) and PPO-inhibitors (Sharpen, Verdict).  “In one of my field corn trials conducted in 2012, a Counter/Steadfast interaction resulted in a 40% yield loss.  The manufacturers of Counter 20G (AMVAC) have put together an excellent publication to address this issue.”

 I have included most of it below.  Here’s also a photo of what the interaction looks like when it happens in corn.

Fullscreen capture 312013 33318 PM Fullscreen capture 312013 33400 PM

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