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Corn Weeds

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aerial view of South Dakota farm and surrounding land

Pest & Crop Newsletter

SDSU Extension publishes the South Dakota Pest & Crop Newsletter to provide growers, producers, crop consultants, and others involved in crop production with timely news pertinent to management of pests, diseases, and weeds in South Dakota.

Waterhemp growing at he edge of a soybean field nearing harvest.

Checking Weed Control at Harvest

With harvest now in full swing, don’t forget to look at your fall weed control. What are the weeds that are left in your crop? Do you know what weeds they are? Is there a weed that you do not know?

Canada thistle growing in a pasture.

Fall Noxious Weed Control

Fall weed control can give the best weed control, but it also can be a poor time. If the noxious weeds were sprayed or clipped earlier this summer, and there is good weed growth now, this would be an excellent time to spray these weeds and get a good kill.

a man standing in front of a cornfield

SDSU Extension Weed Evaluation Extension Demonstration Available at South Dakota State Fair

September 01, 2020

The SDSU Extension Weed Evaluation Extension Demonstration project will be available to the public at the South Dakota State Fair September 2-September 7.

Sunny field with large puffy clouds and blue sky

2020 South Dakota Pest Management Guides Released

August 25, 2020

The 2020 South Dakota Pest Management Guides are now available for free on the SDSU Extension website.

Left: Marestail growing in a field. Right: Young marestail plants emerging from soil. A dime is placed near the plant to demonstrate its scale.

Marestail Fall Control

No-till crop production in South Dakota is on the rise. Marestail is a native plant to the United States and is considered either a winter annual or biennial species that is often difficult to identify at the rosette stage. In the Dakota’s, the Marestail population will germinate in the fall and bolt in the spring.

Kochia growth spreading amongst a patch of soil.

The Fall Advantage of Kochia Control

Kochia is a problem in row crops in North Central South Dakota. New Post-emergent options in corn and soybean have helped alleviate Kochia competition from many fields, but these herbicide options shouldn’t be completely relied upon for a long-term plan for control.

corn field with sunrise in the background

Best Management Practices for Corn Production

iGrow Corn is your unbiased, research-based guide to corn production, providing the latest recommendations to help increase yield, reduce input costs and protect your investment.

A sprayer applying pre-emergent pesticide to a bare field.

Herbicide Rotation Restrictions

This is a quick reference guide to common herbicides and their rotation restrictions for selected crops.

A wet, unplanted field with water pooling and running off into a ditch.

Is Herbicide Carryover a Concern in Wet Weather?

Wet conditions have forced the need to change planting plans. In some cases, crops are planted in areas that were not planned for that crop this year. One factor in moving crops that cannot be overlooked is carryover. Does the ground to be planted have a carryover restriction for the desired crop to be planted?