Insect & Pests
Aphid Populations Detected in Wheat
Aphids are present in South Dakota wheat fields, and that means it’s time to start scouting.
Pea Aphid Alert: Forecasted temperatures could result in rapid population increases
The temperatures during the last week and the forecasted temperatures for next week will potentially encourage rapid pea aphid population growth. Although many fields have been cut recently, pea aphids can still readily recolonize alfalfa.
2026 North Central AAPSE Pesticide Meeting
Join colleagues from across the region for the North Central AAPSE Pesticide Meeting from August 25-27.
Alfalfa Plant Bugs Showing Up in Abundance
There have been several insect pests showing up in alfalfa this season, including the alfalfa plant bug. We consider the above-average spring temperatures and drought-stressed plants in Eastern South Dakota to be the primary drivers of these issues.
Blister Beetles Already Appearing in Alfalfa
Large blister beetles populations were observed while scouting alfalfa this past week. While they usually aren’t an issue until after the first cutting, this early activity means growers should monitor alfalfa fields prior to harvest for the remainder of the season.
Alfalfa Weevils Are Active in South Dakota
Alfalfa weevil larvae are active across South Dakota. Although they had a somewhat slower start this year, we are now observing all instars of the larvae in alfalfa fields.
Aster Leafhoppers Detected in South Dakota Wheat
Aster leafhoppers are present in wheat again this spring. For the last few years, aster leafhoppers have been a common occurrence in South Dakota wheat.
South Dakota Pesticide Container Recycling
The South Dakota Department of Agriculture and Natural Resources is again offering pesticide container recycling services across the state. View a complete list of 2026 dates and locations.
Large Pea Aphids Detected in South Dakota Alfalfa
Pea aphids are a common pest of alfalfa in South Dakota, and large populations have been detected again in 2026. When large populations are present, their feeding can cause the alfalfa fields to take on a “golden” color.
South Dakota Overwintering Bean Leaf Beetle Predicted Mortality: 2025-2026
Each year we evaluate the overwintering success of bean leaf beetles in South Dakota. For adult bean leaf beetles that successfully overwintered, emergence will begin in the spring and they will move into soybean fields.