Herbicide Injury: Nicosulfuron (Accent) Injury on Corn

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Accent injury on corn, showing complete death of ALS susceptible hydrid.

Accent injury on corn, showing complete death of ALS susceptible hydrid.

Acetolactase Synthase (ALS) and Other Products Containing These or Similar Herbicides
(e.g., nicosulfuron, imazethapyr, chlorimuron-ethyl)

Excerpt from OMAFRA Publication 811: Agronomy Guide for Field Crops

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 (as shown), stunting of the plant, a delay in plant development and crinkled leaves or bleaching near the whorl. Onion-leafing or a purpling of stem or leaves may also occur. Some ALS herbicides may also reduce the root mass by shortening lateral roots. These herbicides should not be applied 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: 01 June 2002
Last Reviewed: 25 October 2004