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Japanese beetles found in area traps

Posted Tuesday, July 5, 2011, at 12:07 PM

Japanese beetles are being found in both corn and soybean fields. Catches in traps in Saline counting have been significant for the last two counts ( June 17 and 22).

These significant catches only indicate that there is a need to scout for this insect and that treatment is not automatically needed. One of the biggest threats from this insect is to pollinating corn.

Japanese beetles love to feed on corn silks. When Japanese beetles find a good food source, they produce a pheromone that basically says come and get it to all Japanese beetles in the area.

When you see Japanese beetle feeding there is usually a localized large number of beetles feeding. Pretreating for Japanese beetles especially in corn is usually not productive. When a corn plant is actively growing and silks are emerging, the silks can grow at a rate of as much as 1 inch per day.

If you treat silks and the Japanese beetles come in 2 or 3 days after treating, there can be as much of 2 or 3 inches of new silks exposed that do not have any residual insecticide on it. Japanese beetles have been observed going after the untreated portion of the silks and avoiding the portion of the silks that have residual on them.

The economic threshold for corn is when during the silking period there are an average of 3 or more beetles present per ear, silks have been clipped to inch or less in length, and pollination is less than 50% complete.

In soybeans, treatment is justified if foliage feeding exceeds 30% prior to bloom and 20% from bloom through pod fill.

If you suspect soybean cyst nematodes (SCN) in your fields, now is a good time to check for them. A very quick and easy way to check for the soybean cyst nematode is to dig roots and look for the presence of the telltale, swollen, white females on soybean roots. Roots should not be pulled from the soil because the young roots with the SCN females will be stripped off. Over the course of a week or two, the white adult SCN females will turn yellow then tan, and eventually brown at the female dies.

First wheat yield are available in MU variety testing program at http://varietytesting.missouri.edu/

Not all locations are harvested as of June 30, but harvest is progressing. Results are available for all of the southeast region (Chaffee, Charleston, and Portageville) and southwest region (Adrian, Hughesville, and Lamar) and for Columbia as of June 30.

Pest management day is scheduled at the Bradford Research and Extension Center for July 7, 2011.It starts at 8:30 am and is located 7 miles east of Columbia on Rangeline Road. Pests and cures will be discussed by MU researchers, including weed specialists, plant pathologists and agronomists.

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As our local University of Missouri Agronomy Extension Specialist, Crook has been writing a column for the print edition Agriculture page for the past three years and we will now be sharing it on our web version. Crook has a bachelor and masters degree in agronomy from University of Missouri and received his doctorate in Agronomy from Kansas State University. He was in soybean variety development research for 22 years for various seed companies and has been Saline County's agronomy specialist for 10 years.
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