We have received many questions about dying soybeans. The cause is, at least in part, severe root rot in much of the state.
The recent windy days and reduction in extended moisture events has reduced scab risk for a few areas in ND.
Last week, the IPM scouts examined 86 wheat fields and 11 barley fields.
Downy mildew of sunflower is showing up in many fields in North Dakota and South Dakota.
White mold is a concern in most broadleaf crops once they enter bloom.
The state continues to receive frequent moisture events, moderate temperatures and days of high humidity.
Last week the IPM survey scouts recorded bacterial leaf streak (BLS) in a few wheat fields. Additionally, I noticed BLS showing up in one of my wheat trials on campus. Given these observations, I feel it is important to review information on BLS.
Scouts were able to visit 162 wheat fields and 19 barley fields last week. Tan spot was recorded in 103 wheat fields and severity levels have increased compared to previous weeks.
As canola enters bloom, the crop becomes susceptible to white mold. Fungicides are available that can help manage the disease, so the important decision many growers will face is whether or not the environment is favorable for infection and disease development.
Crop scouts are reporting low incidence of canola blackleg in Bottineau County.
Early planted barley is approaching the stage of greatest risk for Fusarium Head Blight infection (scab). Spring wheat is not far behind.
Using the scab risk models from NDSU and the FHB prediction center, scab risk for very susceptible varieties remains moderate to high for a majority of the state.
The scouts visited 158 wheat fields and 22 barley fields last week.
The IPM scouts visited 147 wheat fields and 16 barley fields last week. Scouts recorded tan spot in 58% of the wheat fields, yet disease severity remains low.
The early season spore stages of sunflower rust (pycnia and aecia) was identified in North Central North Dakota this week on volunteer sunflowers.
For many of the most important diseases of broadleaf crops grown in North Dakota, fungicide efficacy data are now available online at the NDSU Carrington Research Extension Center website.
The IPM scouts visited 143 wheat fields and 16 barley fields last week. Tan spot continues to be the most prevalent disease in wheat and was documented in 38% of wheat fields scouted. Spot blotch of barley was recorded in 6 of the 16 fields scouted.
Potato planting and emergence are behind normal due to the extended winter and delayed arrival of spring and summer. As a result, much of the potato acreage is only recently or not yet planted and emergence will be later than normal.
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 2014.
The start of a cool-wet spring and recent rain events across the state have provided favorable conditions for foliar pathogen infections on small grains. Likewise, IPM scouts are reporting varying levels of tan spot incidence across wheat fields; however, severity is generally low.