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Plant Pathology

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Durum Symptoms in Western ND (07/29/21)

Growers and agronomists have reported discolored awns and glumes of durum heads in several fields in western ND.

Dry Edible Bean Rust (07/29/21)

Currently, I am not getting calls about dry bean rust, but anticipate that it may appear soon. Scouting for dry bean rust is important even in a dry year.

Review of Sunflower Rust (07/29/21)

We have been getting reports of sunflower rust, and suggest that growers scout for the disease.

Be Prepared to Scout for Sunflower Rust (07/21/21)

We are starting to see the first stages of sunflower rust appear. IPM scout Tommy Crompton snapped a picture of the aecial stage of rust in a sunflower field last week (Figure 1).

Bacterial Pustule on Soybean (07/21/21)

I am following up last week’s soybean leaf disease article (bacterial blight, frogeye leaf spot and Septoria leaf spot) with another disease we are beginning to see, bacterial pustule.

Distinguishing Soybean Leaf Diseases (07/15/21)

In response to questions about leaf spots on soybeans, I am providing brief information and photos on three leaf diseases of soybeans; Bacterial blight, Septoria brown spot, and Frogeye leaf spot.

Reduced Risk of White Mold (07/01/21)

Prolonged dry and hot conditions reduce the likelihood of white mold occurring, yet alone causing significant yield loss.

Fusarium Yellows in Sugarbeet Fields (07/01/21)

Fusarium yellows have been identified in several fields in the Sidney factory district. The major Fusarium species found in sugarbeet are F. oxysporum and secorum.

Disease Observations in Wheat (07/01/21)

The dry weather and low humidity have drastically lowered disease occurrence in wheat and barley.

Goss’s Wilt - Yield Loss Question (07/08/21)

The NDSU Plant Diagnostic Lab received its first Goss’s wilt sample last week, and one common question is how much yield loss can we expect from this disease?

Scab Risk Remains Low in ND (06/24/21)

The warm to hot temperatures, infrequent dews, and low humidity have contributed to the low scab risk in the state.

Abiotic (Non-Infectious) Symptoms in Wheat (06/10/21)

The extreme differences in temperature, low relative humidity, and water stress has led to unusual leaf spots on wheat.
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