Corn Weeds

All Corn Weeds Content

Picture of mostly brown soil with two, small, faintly green plants near the center.

Waterhemp Has Emerged in South Dakota

Waterhemp seedlings were observed in Volga, South Dakota and other observations of emerging seedlings have been and reported elsewhere in the state. While the seedlings are still small, forecasted rain and increased temperatures will cause these plants to grow rapidly.

aerial view of South Dakota farm and surrounding land

Crops

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

Herbicide sprayer on the edge of an emerging soybean field.

Syngenta to Stop Production of Gramoxone®

Global pesticide developer Syngenta announced on March 3, 2026 that they will cease global production of the herbicide product Gramoxone® (paraquat), a pivotal source of weed control in corn and soybean production, by June 30, 2026.

Mesonet camera overlooking spring pasture and cropland in Avon, South Dakota.

Great Temperature Shifts This Spring: Implications for burndown herbicide applications

The 2026 growing season is beginning as temperatures begin to increase. The increased temperatures are favorable for growing conditions, however, great temperature shifts throughout the day may adversely affect the activity of herbicide applied for preplant burndown.

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.

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

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.