ISSUE 1 May 5, 2005
ARMY CUTWORM RISK IS LOW
In the fall, 2003 Army Cutworm moth flights indicated southwest North Dakota would have a high risk of economically damaging infestations of Army Cutworm. We began receiving reports at this time last year of cutworm damage in grain fields as well as in pastures and alfalfa fields and many of these fields were sprayed to control this pest. The fall 2004 trap counts for Army Cutworm moths were low so the IPM Western Region Cutworm Survey predicts that Army Cutworm problems will be low in 2005. Traps for these counts were placed near Beach, Bowbells, Center, Dickinson, Mandan, Minot, Mott, and Watford City by local county agents and extension specialists. Even though the risk is considered low for Army Cutworm and Pale Western Cutworm in 2005, fields should still be scouted for pest problems on a regular basis.
North Dakota Army Cutworm Risk Map, 2005
(Source IPM Western Region Cutworm Survey)
No significant rainfall fell this past week in southwest North Dakota. However, cold temperatures and high winds created problems for emerged crops and for producers trying to finish planting the remaining small grains crop. A limited number of acres of canola and mustard (~20%) had emerged prior to the cold weather. Some low-lying areas were completely frozen. However, most fields that had emerged plants had stands thinned but not below the 3 to 4 plants per square foot threshold for replanting. Few fields will need to be replanted. The coldest temperatures occurred on May 3, which was at the end of a week of cold temperatures. The gradual cooling through the week may have lessened the impact of the lowest temperatures, which appeared to have occurred at Hettinger with 13oF and at Hazen and Mott with 14oF. There may be isolated pockets that had temperatures less than those reported here. Reports of leaves frozen off emerged barley and spring wheat as well as winter wheat exhibiting cold stress have been noted. When it is time to apply herbicides producers who have fields, where the first leaf was frozen off will need to remember that even though 4 or 5 leaves are present at the time of herbicide application the plant is physiologically in the 5- to 6-leaf stage. This may have an impact on the weed control program used.
Area Extension Specialist/Cropping Systems
Dickinson Research Extension Center
Minimal rainfall the last two weeks has allowed field work and planting of cool season crops to progress at a rapid rate. Small grain planting is mostly done around highway 2, about half done along highway 17 and 30% in northern regions. Flax and canola planting is ongoing with less percentage completed than small grains. Many growers are done with cool season crop planting and most cool season crop planting will be complete in the next ten days. Corn planting is progress nicely. Seedbed moisture to date is adequate but some concern is being expressed this week about seedbed drying in future days. Freezing temperatures were recorded most nights the last week with lows in the upper teens Sunday night. No reports of emerged plant damage. Winter wheat survived the winter well and attention is being given to spring nitrogen fertilizer application as yield potential is good. Earliest planted spring wheat is now emerging.
Devils Lake Area Office
The geographic area covered by this report includes a northern border of Eddy to Sheridan County southward to Emmons through Sargent County. During the last two weeks the region has been dry and cold. For example, Carringtonís black soil temperature at the 4-inch depth averaged 62 degrees F on April 18 while the temperature dropped to 41 degrees during April 28 to May 2, based on NDAWN (North Dakota Agricultural Weather Network). The regionís NDAWN air temperatures had recorded daily lows of 16 to 22 degrees on May 2 and 3. An inch of participation would be welcome to rewet the topsoil, although the regionís subsoil moisture generally is adequate.
The regionís cool-season crop planting including wheat, barley, field pea, canola, and flax is nearly complete. The majority of the wheat crop has emerged and planted corn acreage is at least 50% south of I94. Emerged wheat and barley were injured (leaf tissue) by the recent low temperatures, but plants will recover. Reports have been received of emerged canola and flax fields damaged by the cold temperatures. Soybean planting has begun, but growers should be waiting until soil temperatures are consistently at or above 50 degrees.
Crop Management Field School Scheduled June 23 at Carrington
A crop management field school will be offered Thursday, June 23, from 9 a.m. to 5 p.m. at the North Dakota State University Carrington Research Extension Center. The school will provide hands-on training for crop advisers on crop, pest and soil management using field research and demonstration plots. Specific field sessions include weed identification, herbicide mode-of-action diagnosis, small grain and soybean disease management, soil health, and tillage systems with emphasis on strip till.
Details and pre_registration information may be obtained by contacting the Carrington Center at (701) 652-2951 or check the website www.ag.ndsu.nodak.edu/carringt/ . A completed pre-registration form and $50 fee is requested by June 20 ($75 after June 20). A total of 50 participants will be accepted on a first-come/first-serve basis. Certified Crop Advisers participating in the event will receive one soil and water management and four IPM continuing education units.
Area Extension Specialist/Cropping Systems
NDSU Carrington Research Extension Center