EPA grants Section 18 to control armyworms in California rice

large armyworms in california rice

Pyrethroids are ineffective against larger armyworms, such as these in the fifth instar growth stage found in a Glenn County rice field a few years ago — photo by Dr. Luis Espino, UCCE

The Environmental Protection Agency has approved a Section 18 emergency exemption for Intrepid 2F Insecticide for use in Butte, Colusa, Glenn, Merced, Sacramento, San Joaquin, Sutter, Yolo and Yuba counties, California.

You need to make certain Intrepid 2F Insecticide is on your rice pesticide (restricted materials) permit at the county agricultural commissioner’s office. The various pesticide database companies will receive the section 18 label to index, providing pest control advisers access to write recommendations.

If considering alternatives to Intrepid 2F Insecticide, please read and follow the pesticide label directions. You can reference the table, “Alternative Insecticides to Methoxyfenozide Registered for Use on California Rice,” but do not use the information as a substitute for the registered label directions.

All section 18 labels are product and not active ingredient (pesticide) specific. The Intrepid 2F Insecticide (EPA Reg. No. 62719-442), from Corteva Agriscience, is the only methoxyfenozide product that legally can be used on rice.

Use of any generic methoxyfenozide products is illegal and could harm future authorizations for usage of the insecticide for armyworm control.

Visit the University of California Rice webpage to see the latest armyworm trap catch data.

Information for this article was provided by the California Rice Commission.