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FMC Insecticide Receives EPA Registration Approval

Steward EC insecticide gains EPA registration.

Corn growers have a new option for protecting input investments from resistant Western corn rootworm (WCR) beetles. Steward EC insecticide from FMC has now received registration approval for use in field corn from the U.S. Environmental Protection Agency (EPA). State registrations for Steward EC insecticide for use on corn are pending. Steward EC insecticide can be included in comprehensive integrated pest management (IPM) programs to control yield-robbing WCR beetles and other lepidopteran pests.

“Western corn rootworms are one of the most destructive corn pests in the U.S., taking a substantial toll on yields and profits through silk clipping and ineffective management costs,” says Sally Feeley, insecticide product manager, FMC. “Steward EC insecticide is the missing link for resistant WCR beetle control, something that has eluded growers due to overreliance on existing products and Bt traits in corn-on-corn acres.”

Steward EC insecticide demonstrated effective WCR beetle control in numerous field studies conducted in various Midwestern states from 2013 to 2016 by Extension researchers, private contractors, and field development researchers. Results show that Steward EC insecticide at 6 and 10 fluid ounces per acre provided 79% and 84% control of beetles, respectively. These evaluations were made from two to five days after treatment to 19 to 24 days after treatment.

The active ingredient in Steward EC insecticide is indoxacarb. Resistance has been reported in the previous three major insecticide classes used for WCR beetle control: organophosphates, carbamates, and pyrethroids. However, indoxacarb has no known WCR resistance or decreased sensitivity, according to the company release. By working through ingestion and contact activity, Steward EC insecticide provides fast-acting protection within four hours of ingestion to prevent impact on yields from reduced pollination because of silk clipping. It is also easy on beneficial mites and insects, preventing flares from spider mites and other insects, according to FMC.

Steward EC insecticide is easy to handle and apply and provides up to two weeks of residual control. Steward EC insecticide features a short reentry interval of 12 hours and rapid dispersal in hard or soft water. FMC says data has also shown that Steward EC insecticide is rainfast within two hours.

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