Corn Weeds

All Corn Weeds Content

Yellow wheat field with green weeds throughout.

Weed Control Field Test Data

Data books to use as a reference to select appropriate herbicide(s) for row crops

aerial view of South Dakota farm and surrounding land

Crops

During the growing season, SDSU Extension provides weekly production recommendations.

Green plant with green, spiny structure at leaf base.

Jan 22

Herbicide-Resistant Weed Program @ Bennett County

SDSU Extension will host an educational program focused on herbicide-resistant weeds on Thursday, January 22, from 12:00-3:00 p.m. at the American Legion (102 US-18, Martin, SD 57551)

South Dakota Pest Management Guides

The South Dakota Pest Management guides are now available for free. The guides offer recommendations for controlling weeds, insects, and diseases in a variety of South Dakota crops.

Aerial view of the SDSU Northeast Research Farm.

Jan Feb 06 - 26

Crop Hour

SDSU Extension Crop Hour webinars provide valuable information for South Dakota crop producers to help them improve their profitability and prepare for the upcoming season.

Gloved hands examining a musk thistle seedhead.

Now is the Time to Plan for Noxious Weed Control in 2026

Most of South Dakota experienced first frosts that were delayed by at least one month, allowing for noxious weed growth to continue later in the season. Now is the time to plan for noxious weed management tactics.

Snow-dusted, harvested field with a few scattered plants throughout.

Now is the Time to Prepare Your Weed Management Plan for the 2026 Growing Season

As harvest season comes to an end, now is the time to start formulating your weed management plan for next year. Learn some expert tips for getting your operation off to a good start this coming growing season.

Corn

Nearly one out of every three dollars generated by South Dakota agriculture starts in a corn field. Two of every three rows of corn become ethanol.

Two pictures; The left has yellow soybean plants with only brown dirt throughout. The right has yellow soybean plants with greenish weeds throughout.

Weed Management via Harvesting Order

Despite The warm and wet growing season that promoted continuous flushes of weed germination, weeds are usually present at the time of harvest. Careful consideration should be taken to determine the order of fields to be harvested.

A green Palmer amaranth weed surrounded by various other green plants.

Palmer Amaranth Confirmed in Turner County: Is this weed in your fields?

Palmer amaranth has recently been confirmed in Turner County. Currently, the estimation of Palmer amaranth infestations has been confirmed in 18 counties across South Dakota