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| Looks like corn smut.
http://www.cbwinfo.com/Biological/PlantPath/UM.html
"Corn smut can infect corn plants under almost any circumstances and control is difficult. There is relatively little natural resistance to the disease. Early destruction of infected plants and crop rotation may be helpful. Losses can be extensive."
Ustilago maydis is unique amongst biological weapons in that it is not only edible, but considered highly desirable. In Mexico, galls on sweetcorn are known as huitlacoche and they can be more valuable than the plant itself. Farmers may therefore try to spread the disease when plants are seen to be infected.
 (Corn smut 4.jpg)
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 Corn smut 4.jpg (99KB - 89 downloads)
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Corn disease (pic)
