Crop & Pest Report

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Plant Pathology

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Scout for Goss’s Wilt and Leaf Blight in Corn (08/13/15)

Over the past two weeks, areas of the state have encountered rain events with high winds and hail. The wind and hail has caused leaf and stem injury in the crops and increases the risk of bacterial disease development.

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Heat Will Express Root Rots (08/13/15)

Less frequent rains and high temperatures are going to stress plants with root problems. Root rot infections often occur early in the growing season, particularly when the soil is wet.

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Monitoring for Sunflower Rust (08/13/15)

I have had received fewer reports on sunflower rust than on dry edible bean rust, however, conditions for rust development have been very favorable in much of the state.

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Dry Edible Bean Rust Continues to Develop (08/13/15)

Frequent dews and warm temperatures continue to provide a favorable environment for rust to develop on dry edible beans.

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Controlling Cercospora Leaf Spot with Fungicides (08/06/15)

Cercospora leaf spot is the most damaging leaf disease of sugarbeet in our area.

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Pre-Harvest Interval for Fungicides on Sugarbeet (08/06/15)

Timely applications of fungicides are very effective at controlling Cercospora leaf spot (CLS) on sugarbeet.

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Late-Season Head Diseases of Wheat (07/30/15)

Harvesting of wheat and other small grains is starting to begin across the state, whereas some of the wheat has a few more weeks before full maturity.

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Soybean Downy Mildew (07/30/15)

We have received dozens of calls about soybean downy mildew in the last week. This is a disease that is often seen in soybeans, but generally occurs at very low levels and rarely causes economic yield loss.

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Septoria Brown Spot vs. Bacterial Blight in Soybean (07/30/15)

Dr. Kiersten Wise at Purdue University wrote an excellent article to help growers distinguish Septoria brown spot and Bacterial blight in soybeans in the July 16th issue of Purdue’s Pest and Crop Newsletter.

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Keep an Eye Out for Dry Edible Bean Rust (07/30/15)

Low levels of dry bean rust has been showing up in the state. This is not necessarily surprising, the frequent and heavy dews and moderate to warm temperatures have been favorable for rust development.

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Keep an Eye Out for Sunflower Rust (07/30/15)

As sunflowers begin to bloom it is important to scout for sunflower rust.

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Fusarium Head Blight (Scab) Report (07/23/15)

The small grain crop is quickly maturing across the state and now is a good time to scout fields for any head diseases; most important Fusarium head blight (scab).

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Rainfall May Drive Some Diseases (07/23/15)

We have had many questions about a variety of diseases this year. Some of the diseases are economically important but some are not.

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White Mold Update (07/23/15)

Frequent rains in much of the state have continued to provide a favorable environment for Sclerotinia ascospore production, the pathogen that causes white mold.

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Questions about the Soybean Cyst Nematode Sampling Program in 2015 (07/16/15)

I have received many calls about the SCN sampling program in 2015.

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Be Ready To Scout for Sunflower Rust (07/16/15)

While surveying for downy mildew last week, Michelle Gilley (Graduate Student and Research Specialist) began noticing an early spore stage of the sunflower rust pathogen (aecia) on sunflowers.

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Downy Mildew of Sunflower: Systemic and Secondary Infections (07/09/15)

We have been hearing a lot of reports about downy mildew of sunflower appearing in many fields in the area.

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Stripe Rust Being Found on Flag Leaves (07/02/15)

The cool, wet weather in June provided ideal conditions for the development of great looking wheat crop.

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Managing Cercospora Leaf Spot of Sugarbeet (07/02/15)

Cercospora leaf spot (CLS) (Figure 1 A, B) is the most damaging leaf disease of sugarbeet in North Dakota and Minnesota.

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Canola Risk Map – June 22 (06/25/15)

Flowering canola in some of the state is currently in moderate to high risk for sclerotinia infection. If daytime highs remain are cool to moderate (60’s – 70’s) and canopy moisture is high, a fungicide application could be warranted.

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