Category Archives: Corn

Moth Trapping Data and Southwestern Corn Borers

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SWCB moth

Just a reminder that moth trapping data are collected weekly and reported on this website under the Quick Links menus (http://www.utcrops.com/BlogStuff/2020MothTrappingData.pdf). Moth catches of bollworm (corn earworm) and tobacco budworm are low, typical of this time of year.  However, southwestern corn borer traps in some areas are pretty high. For those with non-Bt corn, this is a cause for concern in those areas (and perhaps others). This first generation will be found feeding within whorls until they begin stalk tunneling. You can read more about their management by Continue reading

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Corn Maturity Cutoffs for Herbicides

Due to little time and very few good spray days some corn fields have yet to have their lay-by application. Corn is putting on a new leaf every 3 days with all the heat and water. Therefore time is short before it will be too mature to apply any herbicide safely over the top.

The most asked question “is how large can corn be before glyphosate could potentially cause injury”? The glyphosate label states it can be applied up through the V8 corn growth stage. My experience has been if glyphosate is applied to corn larger than that it can at times cause ears to be barren.  This phenomena is difficult to predict ahead of time as it can vary due to maturity of the corn at application, hybrid and weather. Continue reading

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Basics of the CFAP Direct Payments for Corn, Soybean, and Cotton

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Posted for Dr. Aaron Smith, Associate Professor and Extension Economist, Department of Agricultural and Resource Economics, University of Tennessee Institute of Agriculture

The USDA has started accepting applications for CFAP payments to producers that have been adversely affected by the COVID-19 pandemic. Continue reading

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Options to Manage Glyphosate-Resistant Johsongrass in Corn

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Johnsongrass escaping glyphosate + mesotrione: 14 DAA

Glyphosate is no longer an effective Johnsongrass herbicide in Shelby and Tipton counties. This problem appears to have spread, as field observations as well as follow-up research over the past 2 years would indicate that glyphosate is no longer effective on Johnsongrass in a few fields in Crockett, Fayette, Madison, Haywood and Lauderdale counties. Only the counties near the Kentucky line seem to be getting adequate control of Johnsongrass with glyphosate in most every field. Continue reading

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Moth Trapping Data

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Corn earworm (bollworm) moth

A reminder that moth trapping data are updated weekly at http://www.utcrops.com/BlogStuff/2020MothTrappingData.pdf, and you can also access these data on the Quick Links of this site.  Pheromone-baited traps are run for corn earworm (bollworm), tobacco budworm, and southwestern corn borer.

Currently, moth trap catches are generally low, as typically observed this time of year.

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Insects on the Radar

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Black cutworm and cut cotton plant

This article is a reminder about some critters we need to watch for in the coming few weeks. It’s easy to let something slip through the cracks when you are distracted with planting operations. Try to circle back to emerging fields as best you’re able during the first 2-3 weeks after planting to check on plant stands and other issues.

Wheat – True armyworm is the insect most likely to cause issues at this time of year. Even so, it doesn’t commonly require treatment. However, excessive defoliation before the dough stage can reduce yields, and this pest is easily controlled with pyrethroid insecticides. The treatment threshold is 6-8 larvae per square foot while wheat is still in the milk stage. You can read more about true armyworms at Continue reading

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