Crop & Pest Report
Crop & Pest Report
Sugarbeet Root Maggot Flies Emerging Early: Plan Post-Emergence Control Strategies Now (5/24/12)
The first sugarbeet root maggot (SBRM) flies detected by NDSU personnel in the 2012 growing season were found in a field south of St. Thomas, ND on May 11. However, activity levels have remained fairly low for several days thereafter.
Corn Plant Populations and Replanting (5/24/12)
This has been an exceptionally good spring for planting crops. Much of the corn in the state has now emerged. Since conditions were quite favorable for emergence, most plant stands appear to be adequate.
Sunflower Management (5/24/12)
The annual National Sunflower Association (NSA) Field Survey was conducted in September and early October 2011. In North Dakota 77 fields were inspected.
Aster Leafhopper Threat to Canola (5/24/12)
Aster leafhoppers (Macrosteles quadrilineatus) that we are observing in wheat and barley could move into canola and vector aster yellows.
Degree Day Update for Alfalfa Weevil (5/24/12)
The alfalfa weevil DD accumulation as of May 21, 2012 is displayed in the map below (source: NDSU NDAWN – Applications – Insect Degree Days).
Malformed Seed Potatoes May Have Glyphosate Carryover (5/24/12)
Recently, I have observed emerging and newly emerged potatoes that exhibited growth malformations. These symptoms included multiple sprouts at eyes sometimes forming a ‘cauliflower’ formation, a ‘candelabra’ growth or multiple new shoots from a single potato eye with excessive root growth, swollen shoots that have reduced growth, chlorosis on leaf margins, and auxin-like herbicide injury (such as 2,4-D or dicamba) in the leaves.
Small Grain Diseases (5/24/12)
Scattered rains across the state over the weekend and through last night (May 22) will increase the risk of tan spot infection in those areas seeing the most rain. Dew points averaged over 50 degrees in many areas on 5/22, indicating more favorable environment for fungal infection.
Fusarium Head Blight (FHB = Scab) Forecasting (5/24/12)
Winter wheat is rapidly developing in North Dakota and some may be entering heading stage. Many winter wheat cultivars have considerable susceptibility to leaf diseases, leaf rust, and also Fusarium head blight.
NDSU Potato Blightline to Operate in 2012 (5/24/12)
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 2012.
Another Weed of the Year (5/24/12)
Below an observant and studious disciple of the ND weed guide makes some suggestions to improve its utility. Answer to this weed in question is listed below.
Excellent Weed ID Resource (5/24/12)
The Michigan State University IPM Program has collaborated with weed scientists Wesley Everman, Christy Sprague, Steven Gower and Robert Richardson to post “An IPM Pocket Guide for Weed Identification in Field Crops” on-line in pdf format.
Dirt/Dust on Weed Leaves Likely will Reduce Activity of some Herbicides (5/24/12)
With the hot, dry, and windy field conditions in the last few weeks, dirt and dust has been deposited upon leaves of weeds. In addition the hot and dry weather has caused weeds to be stressed and plant growth has been reduced.
Southern Plains Wheat Disease Reports (5/24/12)
Wheat has progressed rapidly in Kansas, being in the milk to soft dough stage at Hutchinson, KS (central part of state), as reported by Bob Bowden, USDA-ARS pathologist.
Root Rots (5/24/12)
I have received questions about the potential for root rot development under dry and warm conditions. Although recent rains have occurred and more rain is in the forecast for some of the state, so there is great variability in soil conditions locally and statewide.
Wild Cucumber Control (5/24/12)
I have received some questions about wild cucumber control. It is a vining type perennial that grows stems each spring from a huge underground woody root (about the size of a volleyball or bigger).
Weed Control Reminders for Sugarbeet Growers (5/24/12)
Thank you to those growers and dealers that have already applied herbicides to sugarbeet that are only at the 2 to 4-leaf stage. This is an excellent start however the season is not over! Scout all fields 5 to 10 days after the initial herbicide application and all later applications to determine the effectiveness of the treatment.
Herbicide Resistance in Waterhemp in MN and ND and Management in Sugarbeet, Corn and Soybean (5/24/12)
Glyphosate-resistant waterhemp continues to increase and spread in Minnesota and North Dakota based upon recent greenhouse testing.
Weather and Crop Phenology Maps (5/24/12)
Maps detailing precipitation, temperature, and departure from normal corn and wheat accumulated growing degree days.
NDSU Crop & Pest Report - May 24, 2012
