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Green corn leaf with common stalk borer caterpillar within.

Common Stalk Borer Activity Update: May 23, 2019

Not too much is new regarding common stalk borer activity when compared to last week. Another cool, wet week has led to a limited accumulation of degree days. Based on our calculations, common stalk borer activity still doesn’t warrant any scouting. We will continue to monitor the degree days and provide updates.

A shiny caterpillar with a light brown head, dark brown body, and three yellow stripes down the length of its back.

Watch Corn for Bronzed Cutworm Activity

Bronzed cutworms are not a common pest of corn in South Dakota. However, they can become an issue when corn is planted into areas that were previously grassland. Like its name implies, bronze cutworms feed on corn above the soil surface, which often results in cutting or clipping.

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

Common Stalk Borer Activity Update: May 30, 2019

Another cool, wet week has led to a limited accumulation of degree days. Based on our calculations, common stalk borer activity still doesn’t warrant any scouting, but spraying field edges should be avoided around Hot Springs, Winner and Vermillion.

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

Alfalfa Weevil Activity Update: May 30, 2019

It was another cool week for most of South Dakota, with little degree day accumulation occurring. However, alfalfa fields should still be monitored for alfalfa weevil activity, although the cool, wet weather might have slowed the pest down.

Left: A close-up of two wheat leaves showing light yellow streaks, a symptom of wheat streak mosaic virus. Right: Winter wheat leaves with small dark brown lesions surrounded by a yellow halo, a symptom of tan spot.

Winter Wheat Disease Update: Wheat Streak Mosaic and Tan Spot Developing at Low Level

Winter wheat fields scouted the week of May 27, 2019 in South Central South Dakota were found with wheat streak mosaic virus and tan spot developing at very low levels. Both diseases were found in non-rotated wheat fields.

Young corn plant with three circular feeding holes in a leaf.

Black Cutworm Caterpillars Are Actively Feeding in South Dakota

We received numerous reports this week of small holes in V1-V2 corn plants. The holes are the result of early instar cutworm caterpillar feeding and, more specifically, black cutworm caterpillars. After hatching, black cutworm caterpillars initially feed on the leaves. As they develop and become larger, they pose a clipping or cutting threat to corn.

Common Stalk Borer Activity Update: June 6, 2019

It finally warmed up and the insects have definitely become more active. However, our calculations indicate that not enough degree days have been accumulated for common stalk borer activity to warrant any scouting, but spraying field edges should be avoided through most of South Dakota in the next week.

Green beetle larvae with white stripe and brown head.

Alfalfa Weevil Activity: June 7, 2019

Quite a few degree days were accumulated over the course of the last week. Alfalfa fields should be closely monitored for alfalfa weevil activity for the next couple of weeks, even in areas where degree days indicate the alfalfa weevils are pupating.

Yellow and black beetle on green soybean leaf.

Watch for Bean Leaf Beetles

Some soybean in South Dakota has emerged and it is already being attacked by early-season bean leaf beetles. So far, observations of adult bean leaf beetles emerging from fields and defoliation of soybean have been in Southeastern South Dakota.

Two young pigs inside a pork production facility.

Creating a Secure Pork Supply Plan

African Swine Fever and preparing for foreign animal disease outbreaks is at the forefront of people’s minds. Your state animal health officials offer guidance for participating in the Secure Pork Supply (SPS) Plan. Let’s take a closer look at the critical steps in developing a personalized SPS Plan for Continuity of Business.