Content by Philip Rozeboom

Tractor applying postemergence herbicide to a corn field early in the growing season.

Considerations of Corn Postemergence Herbicides

Managing weeds after emergence is important to protect the yield potential of corn crops. Learn some important application considerations before selecting a postemergence herbicide.

Small black and yellow beetle feeding on the green leaf of a canola plant.

Don’t Forget to Scout Canola for Flea Beetles

Canola emergence is well underway and ahead of emergence at this time in 2023. There are three species of flea beetles that commonly infest canola and feed on the leaves.

Producer with tablet observing a field in late autumn.

Critical Period of Weed Control: A good, but not perfect guideline

The critical period of weed control is the period during a crop lifecycle when weeds need to be managed to avoid a significant yield loss.

Two pictures of bright, green plants with yellow flowers.

Leafy Spurge or an Imposter?

Leafy spurge is a statewide noxious weed that can be difficult to manage. However, are the recent yellow flowers appearing throughout South Dakota landscapes leafy spurge or another species?

Green alfalfa weevil larvae with a white stripe running down its body.

Alfalfa Weevil Activity Prediction Update: May 29, 2024

Most alfalfa weevil larvae that were observed this week were between the first and second instar, but it is likely that later instars are present in southern counties.

Various weeds emerging from a research plot in some rows, while other rows are weed-free.

Weeds Are Starting to Emerge: Even After a Preemergence Herbicide Application

During recent scouting, weeds were noticed in plots treated with preemergence herbicides. Learn some troubleshooting considerations to help determine why some weeds emerge following preemergence treatments.

Purple-brown caterpillar with orange head on a green corn leaf.

Common Stalk Borer Activity Estimate: May 24, 2024

Throughout South Dakota, common stalk borer caterpillars are still active in alternative weed and grass hosts.

A picture of a absinth wormwood plant that has white colored leaves.

Absinth Wormwood Control in the Spring

Absinth wormwood is a difficult-to-control, noxious weed that can produce great amounts of seed (50,000 seeds per-stem) and spreads only by seed, illustrating the importance of management prior to seed production.

Green beetle larvae with a white stripe running down its body.

Alfalfa Weevil Activity Prediction Update: May 16, 2024

South Dakota finally warmed up and as a result, alfalfa across the state should be scouted for alfalfa weevil larvae.

Top: Field pennycress leaves and seeds. Bottom: Shepherd’s purse leaves and seeds.

Early Season Prevalence of Field Pennycress and Shepherd’s Purse

Many fields that are planted to winter wheat or have yet to be tilled may have a healthy infestation of field pennycress or shepherd’s purse. Learn some expert tips for identifying and managing these weeds before they become a problem this growing season.