Cancellation of Chlorpyrifos

Bryan Jensen, Dept. of Entomology and IPM Program

Some of you have probably heard or seen popular press articles about the Ninth Circuit Court of Appeal’s order ruling that EPA must ban the active ingredient chlorpyrifos which is an active is several insecticides including Lorsban 4E, Lorsban Advanced, Cobalt, Cobalt Advanced and several generic insecticides. At this point it is very early in the process and impossible to tell what the outcome will be and how it affects us.

Currently EPA is reviewing the court’s decision and it is unknown how they will respond. EPA could appeal or decide to fully comply. Perhaps it will be something in between. I am sorry but the best thing to do, for now, is to stay tuned. The glass half-full response is that the 60-day cancellation period will get us through the 2018 Wisconsin growing season. We will just have to take a wait and see approach for next year.

For the interim, you can continue to use chlorpyrifos according to label directions. Typically, with a cancellation or tolerance revocation there is window of time where existing stocks can be used. I do not know if there will be such a window or how long that window will be open. Stay connected.