Herbicide Injury: Nicosulfuron/Rimsulfuron (ULTIM) injury on Corn

ULTIM injury on corn.

ULTIM injury on corn.

Sulfonylurea (ALS) injury on corn often appears as a "flash" on the leaf. Typically, corn outgrows this level of injury. Symptoms can include a yellow discolouration of the leaves, yellow flash on leaf (shown), sunting of the plant, a delay in plant development and crinkled leaves or bleaching near the whorl. Onion-leafing or a purpling of stem of leaves may aslo occur. Some ALS herbicides may also reduce the root mass by shortening lateral roots. These herbicides should not be applid to corn that has been treated with an organophosphorus insecticide due to the increased risk of injury.

Sulfonylurea (ALS) injury on corn often appears as a "flash" on the leaf. Typically, corn outgrows this level of injury. Symptoms can include a yellow discolouration of the leaves, yellow flash on leaf (shown), sunting of the plant, a delay in plant development and crinkled leaves or bleaching near the whorl. Onion-leafing or a purpling of stem of leaves may aslo occur. Some ALS herbicides may also reduce the root mass by shortening lateral roots. These herbicides should not be applid to corn that has been treated with an organophosphorus insecticide due to the increased risk of injury.

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For more information:
Toll Free: 1-877-424-1300
E-mail: ag.info.omafra@ontario.ca
Author:

Greg Stewart - Corn Industry Program Lead/OMAFRA; Mike Cowbrough - Weed Management Field Crops Program Lead/OMAFRA

Creation Date: Not Available
Last Reviewed: 25 August 2003