The Plant Disease Diagnostic Laboratory at the University of Kentucky’s Research and Education Center in Princeton received seedlings of late-planted corn showing symptoms of thrips feeding.
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An absence of rains for almost 2 weeks in western Kentucky allowed the increase in populations of some secondary pests in field corn. One of these insects is the corn flea beetle.
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Be sure to check out the topics and registration information for the Corn and Soybean Field Days on July 21 and 28.
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Weather this spring has challenged corn farmers in Kentucky. Temperature swings and frequent rainfall have led to a wide range of corn growth stages, with some corn in early vegetative stages and some corn still in the bag. The cool, wet conditions that have plagued planting progress recently have also increased the risk of seedling disease in Kentucky corn fields.
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Freeze damage to crops occurs from a combination of cold temperature, the duration of the cold temperature and the crop growth stage. Matt Dixon, Senior Meteorologist with the UK Ag Weather Center, compiled temperatures across Kentucky.
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Corn and soybean plants were emerged in many fields when freeze events occurred last week across Kentucky and the surrounding region. Farmers want to walk fields now and likely walked fields over the weekend.
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Results of the 2019 Kentucky Corn Yield Contest. Winners were honored at the Kentucky Commodity Conference on January 16, 2020.
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Kentucky farmers proudly provide high quality grains for feed, food, spirits and fuel use throughout the southeastern U.S. and around the world. They produced a record level of soybeans, and the 6th largest corn crop in 2018 (Table 1) due to record acreage and near record yields.
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As the brown marmorated stink bug (BMSB) increases in numbers in Central and Western Kentucky, we will see it attacking various crops. Sweet corn is one crop that it can build to high numbers on, while also inflicting serious injury.
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Curvularia leaf spot is a corn disease that was reported for the first time in the United States in Louisiana in 2017; its presence was confirmed in Kentucky in 2018. While the impact of this disease in Kentucky is not yet known, it can cause yield losses in other areas where it occurs.
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Southern rust of corn, caused by the fungus Puccinia polysora, has NOT been confirmed in Kentucky, as of July 16, 2019. However, the disease has been confirmed in southeast Missouri and western Indiana, so it is possible that southern rust is present in Kentucky at low levels.
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Corn is moving through growth stages quickly, and the warm, humid weather in many parts of Kentucky has been conducive for foliar disease development. Fungicides are commonly promoted to reduce the impact of foliar disease in corn, but with tight margins and a difficult market, it is important to pay careful attention to the factors that influence the profitability of a fungicide application.
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Many producers are growing non-GMO corn for niche markets, including distillery and food-grade uses. Non-GMO corn is very susceptible to damage by European corn borer (ECB) and needs to be scouted periodically during ECB first and second generations.
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A farmer in Butler County KY observed a corn field that seedlings were being severely damaged and there was a heavy reduction in the number of stands. Inspection of plants showed entrance holes in the stalk just below ground level, tunnels going to plant crowns, suckers, stunting and center leaves were desiccated (deadheart).
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Seedling corn presenting feeding injures caused by stink bug have been observed in commercial and research plots in western Kentucky.
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Many insecticide seed treatments contain a neonicotinoid insecticide that can move systemically through plants. While producers rely on these treatments as tools to manage destructive pests, they also need to follow some basic steps to protect pollinators.
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View results of the 2018 Kentucky Corn Yield Contest.
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Approximate allowable storage times (days) for corn and soybean in good condition at different temperature (T) and moisture levels based on a ½% dry matter loss, which represents a grade loss.
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