By Darrell Smith, Farm Journal Conservation and Machinery Editor
Originally published in Farm Journal, January 2014
A defensive strategy should include understanding corn diseases, scouting fields and following a management plan
If corn growers compiled a list of their greatest corn disease threats, gray leaf spot, northern corn leaf blight, southern corn leaf blight and Goss’s bacterial wilt would be right at the top. Gray leaf spot would earn its ranking because it’s so widespread. Northern and southern corn leaf blight can sneak in and take you by surprise. Goss’s wilt is moving into new areas at an unprecedented rate.
All those diseases can slash yield. “They attack corn leaves, which function like a plant’s solar panels, taking in energy that is used to produce food,” says Farm Journal Field Agronomist Ken Ferrie. “When leaves are damaged or killed, it affects ear size, stalk quality and standability because when the plant can no longer manufacture food, it cannibalizes itself.”
For complete article visit: http://www.agweb.com/article/big_four_yield_threats_naa_darrell_smith/
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