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United States Department of Agriculture

Agricultural Research Service

Research Project: Winter Rye Cover Crop Effect on Corn Seedling Pathogens Project Number: 3625-21610-002-49
Project Type: Reimbursable

Start Date: Mar 01, 2012
End Date: Feb 28, 2015

Objective:
Determine whether reductions in corn growth and yield sometimes observed following a winter rye cover crop is caused by increased root pathogen infection originating in the glyphosate-treated cover crop.

Approach:
Previous research showed that roots of glyphosate-treated plants have elevated populations of fungal pathogens (Fusarium, Pythium, and Rhizoctonia) which can infect subsequently planted crop plants. Reduced corn yields are sometimes observed following glyphosate-killed cover crops. This research would determine the levels of these pathogens in corn roots where corn is planted after rye cover crop killed with glyphosate or corn without a preceeding cover crop. This comparison would be carried out in field soil or field soil inoculated with these pathogens. The effect of fungicide seed treatments on disease will also be examined. Experiments would be conducted in growth chambers and in field plots.

Last Modified: 8/27/2014
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