Crop & Pest Report


Plant Pathology

ppth.friskop knodel.wheat mite 1

Be on the Lookout for Wheat Streak Mosaic Virus (06/11/15)

There have been several cases of yellowing wheat this year and most have been attributed to nutrient deficiencies and/or the cold wet weather experienced in May.

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Bacterial Blight of Peas in North Dakota and Minnesota (06/11/15)

Samples of field peas with moderate to severe symptoms of bacterial blight have been received by the NDSU Plant Pathology Department.

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Stripe Rust Detected in North Dakota (06/04/15)

On Monday, we received a wheat leaf sample collected by Dr. Janet Knodel and Sam Haugen (Plant Pathology graduate student) that was confirmed as stripe rust.

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ppth.markell.figure 1 soybean damping off

Pythium of soybeans (05/28/15)

Soybeans are sensitive to multiple pathogens (see previous article), but I am concerned about Pythium infections in the earliest planted soybeans. Pythium is favored by cool soils, generally less than 60o F and lots of water. Soybeans that were planted three weeks ago had lots of both.

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Look for Root Rots (05/28/15)

Fields that were planted before the heavy rains began and the cool temperatures set in a couple weeks ago are at high risk for root rot development.

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Small Grains Disease Forecasting Model Website Activated (05/21/15)

After several days of precipitation and with cool weather in the forecast, this is a good time to start scouting winter wheat and spring wheat for fungal leaf spots.

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Sugarbeet Plant Populations for Highest Yield and Quality (05/14/15)

Researchers at North Dakota State University and the University of Minnesota have demonstrated that a wide range of plant population with uniformly spaced plants resulted in high recoverable sucrose, but plant populations of 175 to 200 plants per 100 foot of 22-inch wide rows consistently resulted in the maximum recoverable sucrose per acre. It is important that the plants be evenly spaced within the rows.

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Soybean Cyst Distribution in North Dakota (05/14/15)

During the last two growing seasons, Soybean Cyst Nematode (SCN) has been confirmed in seven additional North Dakota counties.

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NDSU Potato Blightline to Operate in 2015 (05/14/15)

The Plant Pathology Department at North Dakota State University will again be providing the potato Blightline service at no charge to the potato industry of North Dakota and western Minnesota in 2015.

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Overview of Wheat Seed Treatments (05/07/15)

Seed treatments are very important in wheat production and the decision to use one can revolve around several factors such as crop rotation, seed source, planting conditions, history of pest problems, and economics.

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Projections for 2015 Sugarbeet Crop (05/07/15)

Topics Covered include: Sugar production from sugarcane and sugarbeet U.S. sugarbeet acreage Minnesota and North Dakota What are some basic practices growers can follow? What is the status of sugarbeet planting? Practice safety

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High Levels of DON Being Reported in Small Grains (08/28/14)

With winter wheat and barley harvest in full swing, several specialists and crop professionals have reported high deoxynivalenol (DON) levels in the harvested crop.

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ppth.markell.downy mildew survey map 2014

Downy Mildew in 2014 (08/28/14)

Michelle Gilley, a research specialist at NDSU and the USDA sunflower unit, surveyed 105 sunflower fields this summer. She assessed the incidence of infected plants and, when possible, collected pathogen samples for race determination and fungicide sensitivity work that will be done this winter.

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ppth.markell.fig 1.foliar symptoms BSR

Late Season Soybean Stem Diseases (08/28/14)

Now is a great time to examine your soybeans for diseases; particularly stem disease whose symptoms appear late in the season; brown stem rot, charcoal rot and sudden death syndrome (not yet found in North Dakota).

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Soybean Cyst Nematode Field Days Scheduled for September (08/28/14)

The NDSU Extension Service and the North Dakota Soybean Council are working together on three soybean cyst nematode (SCN) field days this summer. The three field days will be on September 18th (near Hunter, ND), September 22nd (near Wyndmere, ND) and September 23rd (near Galesburg, ND).

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ppth.markell.scn survey 2013 map

2014 SCN Soil Testing Program – Coming Soon (08/28/14)

The NDSU Extension Service and the North Dakota Soybean Council are working together to coordinate an SCN soil testing reimbursement program again in 2014.

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ppth.chapara.friskop.1.vascular plugging corn

Goss’s Wilt and Leaf Blight of Corn (08/14/14)

Goss’s bacterial wilt and leaf blight of corn was found in northwest McHenry County last week indicating that now is a good time to start scouting for this disease.

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ppth.markell.1.patches clubroot canola

Scout for Clubroot at Swathing (08/14/14)

In the last several weeks, clubroot has been found in several fields in the NE part of the state.

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ppth.friskop.3 4.fusarium head blight susceptible and very susceptible varieties maps

Scab Risk in Late-Planted Spring Wheat (08/06/14)

With the wide range of planting dates this year, wheat is flowering at different times. If you have late-planted spring wheat that is approaching flowering, use the scab risk models to determine if a fungicide application is needed.

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ppth.friskop.1 2.tan spot incidence and wheat scab field severity index.

IPM Survey – Small Grain Disease Update (08/06/14)

Over the past two weeks, the IPM scouts visited 181 wheat fields and 8 barley fields. Scab was reported in 41 wheat fields and scab incidence ranged from 1% to 51% within those fields.

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