Lately, I have been getting a lot of calls about the use of Cadre (imazapic) in peanut. Since we have many new county extension agents and us old folks have fading memories, I thought it might be a good time for a quick review. Here are 10 things about Cadre you may or may not have known.
1) The active ingredient in Cadre was first discovered in 1981 by American Cyanamid Company.
2) Cadre was first registered for use in peanut in 1996.
3) Cadre was tested under the code number AC-263,222. Much of the foundation research on AC-263,222 was conducted in Georgia [Drs. John Wilcut (former VT, UGA and NCSU Research Weed Scientist) and John Richburg (Corteva)].
4) Cadre was first formulated as a 70DG but is now sold a 2AS.
5) Although most peanut growers usually apply Cadre around 30-45 days after planting (DAP), it can be applied earlier. Peanuts have excellent tolerance to Cadre. Check out this older Georgia yield data.
6) In some other countries (i.e. Australia), imazapic is applied preemergence (PRE). Cadre is not labeled for PRE applications in Georgia peanuts because PRE applications are more likely to result in cotton carryover problems (and other sensitive crops) and also can be less effective on Florida beggarweed.
7) Cadre can occasionally cause "yellow flash" injury when used in peanut.
8) ALS-resistant Palmer amaranth was first confirmed in Georgia in 2000 after collecting seed from a peanut field where Cadre treated plants survived the application.
9) ALS-resistance in yellow nutsedge was confirmed in Georgia in 2021. In this field, peanuts were grown continuously for 4 years where ~18 oz/A of Cadre was applied during that time period. Not the normal use pattern or rotation sequence for most of Georgia.
10) Imazapic is sold under many trade names including Impose, Plateau, and Comrade.
