3 articles tagged "corn disease".

Author: Darcy Telenko We are collecting corn tar spot samples and we need your help! Tar spot of corn is a new corn disease first identified in the United States in 2015 in Illinois and Indiana. It has since been confirmed in Iowa, Michigan, Wisconsin, and Florida. What to look for: Small, black, raised spots (circular or oval) develop on infected plants, and may appear on one or both sides of the leaves, leaf sheaths, and husks. Spots may be found on both healthy (green) and dying (brown) tissue. Often, the black spots are surrounded by a tan or brown halo; this is especially obvious on healthy leaves (see images). The University of Illinois needs samples of corn infected with tar spot from across the United States as part of a new research project investigating the variability of populations of the corn tar spot pathogen. We would also like to[Read More…]

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Author: Darcy Telenko Corn diseases have been on my radar these past few weeks as I am just getting my boots on the ground in Indiana. Many aerial fungicide applications are going out around the region, corresponding to crop maturity and the uptick of grey leaf spot. As a result the biggest question I have received this week is, “Should we spray our corn for grey leaf spot?” Fungicides can be effective at reducing disease and protecting yield, but there are a number of factors that should be considered: the field history/previous crop, the amount of disease present in the field, hybrid susceptibility, weather conditions, and the price of corn and cost of fungicide application. Grey leaf spot is probably the most prevalent disease issue this year to date. It is caused by the fungus Cercospora zea-maydis. Symptoms of grey leaf spot usually first appear in the lower canopy a[Read More…]

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