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Seecorn maggot larva feeding on a seed in a field.

Seedcorn Maggot Degree Day Activity Estimates: June 3, 2021

We are currently between the second and third generation peak emergences in South Dakota. Seedcorn maggot management must be done before planting, or the populations can be avoided by not planting during times of peak emergence.

Tools and equations used to measure body mass index.

Body Mass Index Explained

We have all likely heard of measuring health through calculating body mass index. Body mass index is a ratio of your weight to height and a screening method used to determine a person’s weight category.

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

Common Stalk Borer Activity Estimate: June 10, 2021

The hot temperatures last week have resulted in a large increase in degree days for common stalk borer. Common stalk borers should now be scouted for in areas around Hot Springs, Lemmon, Mission, Pierre, Winner, Huron, Mitchell, Tyndall, Sisseton and Vermillion.

White goat resting in a drought-stressed pasture.

Heat Stress in Small Ruminants

The Upper Midwest provides periods of extreme heat during summer and shorter periods of heat stress potential during spring and fall. Are your sheep and goats cool enough in their environment?

Grazing stick being used to assess current grassland status.

Measuring Grassland Production

Assessing pasture forage production is a key step in planning harvest strategies and can also inform the manager on the status of wildlife habitat or other grassland values.

Small group of black angus cattle grazing in a rolling, well-managed rangeland.

Estimating Livestock Consumption

When planning a grazing strategy, it is important to carefully assess goals and objectives and then match those goals and objectives with the appropriate livestock. It is critical that the manager understand that not all livestock are created equal.

Eight green beetles in a row in the top half of the image and a row of seven yellow beetles with varying black stripes in the bottom half of the image.

Corn Rootworm Egg Hatch Estimates

Corn rootworms overwinter in the soil as eggs and hatch in the spring when enough soil degree days have been accumulated. Based on soil degree day accumulations, most of South Dakota has reached 50% corn rootworm egg hatch.

Orange and metallic green moth resting on a green leaf.

Squash Vine Borers Ramping up in South Dakota

Last week squash vine borer moths were observed in South Dakota. For this reason, it is important to scout for the moths as well as eggs on the stems of zucchini, squash, pumpkins and related produce.

Cowpea Aphids Infesting Alfalfa

Typically, we worry about pea aphids in alfalfa. However, we noticed that cowpea aphids were present on alfalfa this week. If left unmanaged, cowpea aphids can stunt alfalfa, reduce yields and even kill the plants during severe infestations.

Two mites. From left: Green leaf with two yellow spider mites with dark spots. Green leaf with yellow spider mite.

Spider Mites Reported in South Dakota Crops

With drought conditions continuing in South Dakota, it isn’t surprising that two-spotted spider mite infestations are being reported throughout the state. With hot temperatures in the forecast and limited chances for precipitation, we can expect spider mite populations to thrive in infested fields.