By WCM Staff on 7/28/2005 12:31 PM

Corn fields in western and west central Wisconsin are exhibiting advanced armyworm larval stages and extreme corn leaf feeding to the midrib. Some of the reports, as detailed below, are related to grassy weed presence and/or later than optimal grassy weed control. However, more extensive field areas are being defoliated due to heavy populations, independent of weed management issues.

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By WCM Staff on 7/28/2005 12:08 PM

Spider mites continue to be present on soybeans in Wisconsin. The main questions coming in by phone and at field days over the last week are “What is the threshold for two-spotted spider mite?” and “How will the recent strong storms affect mite populations?”.

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By WCM Staff on 7/28/2005 11:22 AM

As reported in the July 21st issue of Wisconsin Crop Manager, soybean aphids continue to warrant close monitoring. By mid-July fields exceeded threshold in many southern WI counties and received timely insecticide application based on populations in excess of 250 aphids per plant average.

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By WCM Staff on 7/7/2005 2:03 PM

A recent article published in the February 2005 issue of Journal of Economic Entomology titled “Node-Injury Scale to Evaluate Root Injury by Corn Rootworms (Coleoptera: Chrysomelidae)” (Oleson et al. 2005) provides new and improved guidance for the annual corn root rating task.

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By WCM Staff on 7/7/2005 12:57 PM

Over the next couple of weeks of July, we enter the crop season window during which to evaluate corn root injury by corn rootworms. We are planning to dig roots, soak and then wash the soil away with a high pressure hose stream, and quantify root injury in our UW Madison Entomology research trials, insecticide efficacy program, and on-farm studies between the dates of July 18th and July 25th.

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