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Corn Field Day set For Aug. 1 in Ogema

Area producers are invited to attend a Corn Field Day on Friday, Aug. 1 in Ogema, at Bill and Eric Zurn's corn production field located two miles south from Ogema on Highway 59 and two miles west on Becker County Road 155. The Field Day will begin at 9:30 a.m. and conclude at noon.

The agenda for the day is scheduled to include:

- Corn Production Tips -- Jeff Coulter, University of Minnesota Extension Corn Specialist;

-Corn N, P & K Starter and Hybrid fertility plots and Corn Jumpstart Inoculants X Avail Trial -- Dan Kaiser, U of M Extension Nutrient Management Specialist;

- Corn Nitrogen Rate Study -- Russ Severson, U of M Extension Educator, Crops;

- Corn Sulfur Study -- Ray Bisek, U of M Extension Educator , Mahnomen, Polk and Norman counties;

- Corn Insect Update and Outlook -- Phillip Glogoza, U of M Extension Educator, Crops.

For more information, or to get a brochure about the Ogema Corn Field Day, please contact: Will Yliniemi, Becker County Extension, at 1-218-846-7328 or cell 1-218-252-1042; or Ray Bisek, Norman County Extension at 218-784-7183.

Insurance insecticide treatments for soybean aphids?

University of Minnesota Entomologists outline why they are concerned about this management strategy in this article. Everyone dreads another pesticide trip across the field. You may be planning or have been encouraged to apply an insecticide with a glyphosate application, without regard for aphid populations in the field. While this strategy may occasionally work out, there are several potential problems that can arise from this strategy.

- Cost: There is no data to suggest that very low aphid populations hurt yield. Early applications are more likely to be re-colonized and require re-treatment. Claims of insecticide residual activity lasting a month, or longer, have little factual basis, particularly when applications are made to rapidly growing soybeans.

- Resistance: The more often soybean aphids are exposed to insecticide the more quickly insecticide resistant populations will develop. More than one product could lose effectiveness at once, depending on the mode of resistance. An unpleasant wrinkle to soybean management would be aphids that won't die.

n Increasing populations of soybean aphid, or other arthropod pests (e.g. spider mites) by removal of beneficial species: Removal of beneficials (predators and parasites) can have unexpected consequences. Yes, this really does happen! Imagine how quickly newly arrived aphids reproduce when you've already removed the beneficials for them. When we do this with cages that exclude predators, aphid populations go from 10 to more than 1000 in a little more than a week.

- Compromises leading to poor insect and/or weed control: Ideal nozzle, water volume and pressure selection for insecticide and glyphosate applications are not the same. Herbicide and insecticide timings should be based on when to apply to the target pest (weed or aphid) to be most successful.

You are responsible for managing your crop for a profit. There is nothing illegal about applying an insecticide labeled for soybean when aphid populations are below threshold.

However, insecticide applications do have consequences in the environment. We wish only to point out that there are potential short and long term risks when insecticide applications are made without regard to pest populations.

Sources: Kenneth Ostlie, Extension Entomologist, University of Minnesota; Bruce Potter, Southwest Minnesota IPM Specialist, University of Minnesota; David Ragsdale, Entomologist, University of Minnesota.

For more information, please contact: Will Yliniemi, Hubbard/Becker County Extension Educator at 1-218-732-3391, 1-218-846-7328 or by cell at 1-218-252-1042, or by e-mail at