Skip to main content

Crop Management

All Crop Management Content

Two, dark green aphids on a bright green leaf.

Aphid Populations Being Observed in Wheat

During the past couple of weeks, reports of aphid populations in wheat fields have slowly been increasing. Typically, the initial aphid populations are observed earlier in the season, but the 2019 spring may have delayed infestations.

Green soybean plant with holes on the leaves (indicated by red arrows) caused by bean leaf beetle feeding.

Scout Soybeans for Bean Leaf Beetle Feeding

We are receiving numerous reports and also observing very large bean leaf beetle populations this year. As a result, there is also a lot of concern about soybean defoliation due to the emergence and subsequent feeding by the overwintering adult population.

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

Flea Beetles Defoliating Canola in South Dakota

This year flea beetle emergence is behind schedule, but so is a lot of the canola emergence. We are observing very large flea beetle populations on late-planted canola that is just emerging. As a result, much of this canola is being heavily defoliated and will likely require foliar insecticide management.

United States Environmental Protection Agency logo.

Cancellation of Several Neonicotinoids

On May 20, 2019, the United States Environmental Protection Agency announced the cancellation of registrations for 12 products that contain neonicotinoid insecticides. The cancellation of the product registrations was voluntarily requested by the companies that had registered the products.

A green pea leaf with white, powdery spots throughout.

Powdery Mildew: A Disease Concern in Field Peas

Producers of field peas may need to scout for powdery mildew this year. Powdery mildew is a late-season fungal disease that can impact peas if weather conditions are conducive. However, this disease can also occur in early planted fields in South Dakota under the right environmental conditions and when the crop canopy is heavy.

Three types of plant bugs. From left: Meadow plant bug, Lygus bug, and alfalfa plant bug.

Plant Bugs Showing Up in Alfalfa Fields

Plant bugs are now becoming active in alfalfa fields across the state. A common question we receive is why some of these bugs looks so different from others. There are actually three different types of plant bugs that commonly appear in alfalfa fields: meadow plant bugs, Lygus bugs (aka tarnished plant bugs), and alfalfa plant bugs.

Green leaves on a buckthorn tree covered with crusty spots of bright orange crown rust inoculum.

Oats Crown Rust Inoculum Abundant This Year

Crown rust is the most important fungal disease of oats in South Dakota. In years with heavy disease pressure, susceptible cultivars can have over 80% yield loss due to crown rust. The presence of crown rust inoculum on buckthorns can be an indication of the likely risk for crown rust to develop during the growing season. Buckthorns scouted recently were loaded with crown rust inoculum.

A color-coded map of South Dakota. The majority of the map is green, with a small patch of yellow and some specs of red in the East, South Central part of the state.

Use the Scab and Leaf Disease Forecasting Tools to Decide on Fungicide Application in Wheat

Fungicide application in winter wheat has consistently shown to prevent yield loss caused by fungal diseases. However, in some cases, a fungicide application may not always result in a profitable yield when disease pressure is low. Disease forecasting tools can aid fungicide application decisions and hence improve on the profitability of fungicide application.

A field of green winter wheat.

SDSU Extension Hosts Crop Performance Tours for Wheat, Oats & Field Peas

June 13, 2019

SDSU Extension will host summer tours of winter and spring wheat, oat and field pea crop performance trials across central & western South Dakota in June and early July. SDSU plant breeders, field staff and SDSU Extension staff will be available at all locations to answer questions and look at samples.

Corn, Soybean, Wheat, Crop Management, Crop Performance Testing, Crop Treatments