Many of you are aware that Marcia McMullen, Extension plant pathologist at NDSU, retired in the fall of 2013.
Rhizoctonia solani causes Rhizoctonia damping-off of seedlings and root and crown rot of older plants. This pathogen is becoming more widespread and damaging, probably because planting is done in conditions more favorable for infection and disease development and the use of more host crops in the rotation probably increases inoculum population.
Planting of the 2013 sugarbeet crop is progressing rapidly in North Dakota and Minnesota. Rains that were really needed stopped planting operations at American Crystal Sugar Company (ACSC) where just over 80% of the projected acreage was planted.
The projected total sugar use for 2013 is expected to be 11 million short tons raw value. About nine million tons of this sugar will be produced in the US with just over 5 million tons coming from sugarbeet. Total US sugarbeet acreage is expected to be about 1.2 million acres.
Rust has been found in multiple fields on both sides of the Red River. Most rust has been detected in localized hot spots but severity has varied greatly. Fungicide applications are not recommended at late growth stages (approximately when pintos begin to stripe) and in fact, rust will cause beans to dry down quicker.
Soybean cyst nematode is the most important soybean disease in the United States and it has been found in 12 North Dakota Counties. The disease is manageable but it is much easier to manage if it is detected early. Once SCN levels rise to high levels in a field, management becomes much more difficult.
Put warm days and warm nights together, add some moisture from rainfall or dew along with some sugarbeet plants with leaf spots and you have a great recipe for rapid development of Cercospora leaf spot.
In the last couple weeks low and localized levels of dry bean anthracnose have been found in the region. The disease was found in multiple fields in the same general area it was detected last year; the central production region.
Dr. Pasche and I are actively collecting rust and anthracnose samples for race identification. The more samples we have the more accurate our information about the pathogen will be.
The Animal and Plant Health Inspection Service (APHIS) of US Department of Agriculture (USDA) announced on July 19, 2012, its decision to deregulate Roundup Ready sugarbeet after conducting and considering a comprehensive environmental impact statement.
Cercospora leaf spot (CLS), caused by Cercospora beticola, is the most severe foliar disease of sugarbeet in Minnesota and North Dakota. In favorable conditions - the presence of moisture or relative humidity >87%, day temperatures of 75-90°F and night temperatures above 60°F - the fungus can rapidly increase its numbers and cause severe disease. As such, application of effective fungicides or fungicide mixtures at first symptoms is necessary to effectively control the pathogen.
NDSU IPM field scouts surveyed 547 wheat fields across North Dakota in 2012. The season began early because of early spring warm-up, with some scouting starting on May 15. The season ended in the south by the end of July and in the north on Aug. 10.
Winter wheat was a successful crop for most North Dakota producers this year, and producers will soon be planting the fall crop.
Fifty barley fields were surveyed in ND in 2012 representing all areas of the state. As with wheat, high temperatures and lack of moisture in most regions resulted in low disease pressure on the crop.
In addition to the above crops surveyed, NDSU IPM field scouts also looked at insects in these crops and insects and diseases in soybean, dry bean and sunflower.
Kasia Kinzer (NDSU plant diagnostician) and I are beginning to get samples and calls about sick soybeans. Soybean that are prematurely ripening or dying, often in patches in fields, are a common complaint/question.
I have been asked about the yellow spots on the top of soybean leaves (Figure 1).
Dr. Tom Gulya visited 54 fields last week in south central and south western North Dakota. He observed 17 fields with traces of downy mildew, and that was practically the only disease observed.
There were eight more potato psyllids were found in North Dakota this past week and one psyllid in Minnesota. Keep scouting fields for potato psyllids and monitoring nearby psyllid traps.
Yesterday, I was in Minnesota and observed fields with early blight. These fields were along the Highway 10 corridor from Wadena to Big Lake.