Content by Philip Rozeboom

Have you observed chemical management failure for alfalfa weevils?

SDSU Extension entomologists are currently looking for alfalfa fields with a past alfalfa weevil insecticide failures. We are collaborating with North Dakota State University and the University of Minnesota on project to determine if pyrethroid resistance exists in our respective states.

South Dakota Grasshopper Prediction for 2026

Almost every year in South Dakota there is a risk that grasshopper populations will reach levels capable of causing issues for producers. Unfortunately, our prediction for the 2026 growing season won’t change the trend.

Drought Conditions Magnifying Impact of Black Grass Bugs

Black grass bugs are a common early-season pest of forage grasses. Drought conditions exacerbate their impact by stressing plants and reducing their ability to tolerate and recover from feeding injury.

Start Management Plans Now: Absinth wormwood, Canada thistle and leafy spurge have emerged and are starting to grow

Absinth wormwood, Canada thistle and leafy spurge have emerged and are growing in eastern South Dakota. If not effectively managed, these weeds can displace desirable forage in pasture and rangeland.

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.

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.

Organic Herbicides for Lawns

Organic herbicides are becoming more common on the market due to the perception that these products as safer towards humans, pets, and the environment. For those interested in these products, there are several factors to consider.

Ants Preparing for Another Busy Year

A wet growing season last year combined with a mild winter has boosted ant activity across the state, and we have already received numerous questions from both curious and concerned residents in South Dakota.