Seminole Crop E News

Agricultural News for Farmers and Agribusiness in SW Georgia

Corn Herbicide – Insecticide Interaction

Posted by romeethredge on March 5, 2015

We have long known that when we use the soil insecticide/nematicide, Counter, we have to be careful which weed killers we use due to the interaction causing damage to the corn. Dr. Eric Prostko, UGA Weed Science, gives us some more information on the subject.

1) Why can’t certain herbicides be used after an in-furrow (INFR) application of Counter in field corn?

Organophosphate (OP) insecticides, amino acid synthesis (ALS) and certain pigment (HPPD) inhibitors are metabolized in field corn by the same enzyme system (cytochrome P450 monooxygenase).  When these pesticides are used sequentially (In-furrow + POST) in field corn, this enzyme system cannot successfully metabolize both active ingredients.

2) How bad would corn yields be affected if this accidentally happened?

Research results from 2012 would suggest that yield losses could exceed 40% if an inappropriate herbicide was used following an INFR application of Counter.

3) What herbicides can be applied in field corn if Counter is used in furrow?

The following herbicides, commonly used in GA field corn production systems, are safe to use if Counter is applied INFR:

Aim, Atrazine, Clarity, Dual Magnum, glyphosate, Impact, Laudis, Liberty, Prowl, Status, Warrant, 2,4-D, and any pre-mix containing these ingredients.

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