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Oat leaf with very low crown rust.

Oat Crown Rust Risk Low This Year

Oat fields recently scouted were found with very low levels of crown rust. This is primarily due to warm and dry weather conditions that we are currently experiencing.

Mosquito resting on a dandelion seed head.

West Nile Virus Update: Aug. 2, 2021

As of Aug. 2, 2021, the South Dakota Department of Health indicated that West-Nile-virus-positive mosquitoes were detected in Brookings, Codington, Hughes, Lincoln and Brown counties in South Dakota.

Three soybean fields with yellowing issues due to potassium deficiency, iron deficiency chlorosis and soybean cyst nematode.

What Is Causing Soybeans to Yellow at This Time?

Recently scouted soybean fields were observed with yellowing plants, and one field was found to have plants dying prematurely. Learn some of the factors that may cause soybean plants to yellow at this time in the growing season.

Green soybeans with yellowing throughout.

Bacterial Blight Developing In Some Soybean Fields

Bacterial blight was found developing in a few soybean fields scouted the week of July 19. Leaf tattering is a common symptom of bacterial blight and happens when expanding bacterial blight lesions coalesce and form large brown patches.

Yellow wheat with grey colored wheat heads.

Sooty Mold: A Saprophytic Fungi Observed in Wheat

While out crop scouting, sooty mold was observed in some South Dakota wheat fields. Sooty mold is a saprophyte, which can be easily mistaken for a disease caused by plant pathogens.

Three bean leaf beetles. From Left: Brown beetle with black spots on a green leaf. Yellow beetle with black spots on a green leaf. Red beetle with black spots on a green leaf.

Monitor Soybean for Bean Leaf Beetle Activity

Some of the bean leaf beetles we are currently observing in South Dakota may make up the population of overwintering adults. While these adults are in soybean, they can cause significant amounts of defoliation to the leaves.

Left: Large green leaves of hosta have white and yellow discoloration on the outside edge of the leaves. Right: A green pepper with a tan spot that appears mushy.

Leaf Scorch and Sunscald in the Garden

Long stretches of hot, dry weather will upset the growing habits of all plants and will lead to some unusual symptoms on leaves and produce in the garden. July and August are a prime time to watch for leaf scorch and sunscald.

A soybean plant with wilting leaves due to stem canker surrounded by healthy soybean plants.

Stem Canker Developing in Some Soybean Fields

A few soybean fields are showing some wilting plants due to stem canker. The field entries and head rows are the most-impacted parts of these fields. The current dry conditions are stressing the plants and causing early development of the disease.

Young farmer examining soybean plants n a field at sunset.

Be Aware of Fungicide Resistance in Field Crops

A few soybean and corn fields have received or will be receiving a fungicide application this season. We recommend scouting fields treated with fungicides to determine if diseases are controlled as expected or if there are signs of reduced sensitivity.

Young woman photographing leaf-scorched hostas in a garden.

Garden and Yard Problems Solved: How to Submit Photos and Samples to Our Experts

Garden and lawn issues can sometimes be diagnosed by simply looking at a photo. Photos give our Extension experts a place to start, and providing them with the best possible photo can help the process.