ISSUE 6 June 9, 2005
Very few days were available for fieldwork in southwest North Dakota last week. Rainfall provided an inch or more generally over the entire area with Bowman NDAWN site receiving the least 1.11 inches and Hazen NDAWN site receiving the greatest amount at 3.53 inches. Some small hail was reported with a few reports of fields being damaged. Friday, Saturday, and Sunday were suitable for spraying. Monday was too windy to spray with wind speeds reported at 40 to 45 mph at most locations although seeding of late seeded crops continued until it began raining late afternoon or early evening.
This past week stripe rust and leaf rust infections in spring wheat were confirmed in southern Grant County fields and leaf rust in a western Adams County field. Incidence and severity of rust infections in both counties was low. Aphids were found in a Dunn County field in very low numbers.
In southeast Stark County large numbers of Armyworm moths were found in a wheat field. This should be an early warning to producers to include scouting for Armyworm larva. When Armyworm larvae are young they will be pale green turning a dark green as they mature. Fully developed larva will grow to a length of 1 Ĺ to 2 inches. A series of stripes down the back and side of the body will be found. Armyworms feed at night and hide under vegetation or in loose soil during the day. When scouting, look for fecal pellets and feeding damage. Then look for larvae under plant trash, soil clods or in soil cracks. Treatment threshold in small grains is at 4 to 5 or more larva per square foot. Armyworms will also feed on other small grain crops as well as corn, alfalfa, clover, flax, and millet.
Weeds such as Persian darnel, Japanese brome, and downy brome are becoming more prevalent in wheat fields in the southwest. Fenoxaprops have done an excellent job of controlling wildoat and foxtails but provides no control of Persian darnel, Japanese brome or downy brome. This makes proper weed identification very important. Once found, producers should consider using products such as Achieve, Discover, Everest or Olympus. Consult the label for specific weeds controlled and directions for use.
Area Extension Specialist/Cropping Systems
Dickinson Research Extension Center
The region received from 1 to 2 inches of rainfall in the last week. Extremely wet soil conditions north of highway 66 and east of highway 1 and in the Red river valley counties has prevented planting soybeans and wheat in Pembina county, cool season crops in Cavalier county, and soybean, sunflower and dry beans in Walsh and Grand Forks. Cool season crop development is very good. Earliest planted wheat and barley is in the 6 leaf stage. May planted soybean, sunflower and dry bean are emerging to having initial leaves developed. Earliest canola is about 10-14 days from first bloom. Some flax is 3 inches tall and being sprayed for weed control. Earliest planted corn is about 4 leaf stage. Winter wheat flag leaves are emerging and head emergence will be common in 10 days and growers will need to gear up for fungicide spraying if wet weather continues. Growers are mainly concerned with controlling weeds in wheat and barley. Continued wet conditions in the next couple of weeks will bring concerns of white mold development in canola. Scouts are looking for cutworm in row crops and sunflower beetle infestations in the next week in sunflower.
Area Extension Specialist
Devils Lake Area Office
During the past week (June 1 to 7), the south-central regionís rainfall ranged from 0.3 inch at McHenry to 3.4 inches at Edgeley as recorded at NDAWN (North Dakota Agricultural Weather Network) sites. Considerably higher amounts of rain were unofficially reported in south-eastern counties. The regionís soil moisture is currently adequate to surplus. Due to rain, growers continue to struggle to complete planting of the less than 10 percent of the remaining acres due to rain. The regionís cool-season crop fields generally continue to have good to excellent plant stands and yield potential. Canola planted on April 8 at the Carrington RE Center is beginning to flower. The majority of the regionís spring wheat crop is in the 5-leaf to jointing stages. Herbicide application in small grain is nearing completion (except in northern counties) and is in progress in corn, flax, and soybean when weather conditions are cooperative. Last week, white grub injury to corn in LaMoure County was detected and a few small grain aphids were found in Burleigh and Sheridan counties.
Area Extension Specialist/Cropping Systems
NDSU Carrington Research Extension Center