By Dave Nanda
Northern corn leaf blight and gray leaf spot damage and insects may be reduced by cover crops, even in corn-soybean rotations.
Published on: Aug 18, 2015
While scouting corn fields in southeastern Indiana during the last three years, I've noticed fewer disease lesions of northern corn leaf blight and gray leaf spot in fields following cover crops. That could prove to be a major, underemphasized benefit. Disease lesions were more prevalent even on fields where corn was grown two years ago in a corn-soybean rotation when no cover crop was used.
I scouted corn fields with NCLB and GLS where cover crops weren't used. Less than 20 miles away, I had a hard time finding disease lesions on hybrids with exactly the same genetics – where cover crops were used.
These fungal disease spores remain viable for years. Cover crop residue seems to............
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Sustainable ag cover crops may be biological bug killer