ISSUE 2 May 12, 2005
CANOLA INSECT UPDATES:
Diamondback moth ĖThe first Diamondback moths were captured in pheromone traps at NCREC, Minot and observed in Fargo around mid-April. This marks an early and the first arrival of these migrating moths into North Dakota from the southern states. Adult moths have also been observed in fields of volunteer canola in southern Manitoba. Fortunately, trap counts numbers are low so far.
Crucifer flea beetles Ė Crucifer flea beetles, Phyllotreta cruciferae, is the main species of flea beetles that attacks canola in North Dakota. It was recently collected on yellow sticky traps at NCREC, Minot. Several people commented on flea beetle activity early in April, but these were other species of flea beetles, such as, the striped flea beetle (Phyllotreta striolata) and the sweetpotato flea beetle (Chaetocnema confinis), which emerge earlier. Warmer weather will trigger higher numbers of crucifer flea beetles in the next few weeks.
Area Extension Specialist
North Central Research Extension Center
The region received from 3 plus inches of rainfall in areas south of highway 2 to 1 to 1.5 inches or less in most areas north of highway 2. Good progress has been made in cool season crop planting. Many growers south of highway 17 are finished with wheat, barley and pea planting and are finishing canola , flax and corn. Soybean and sunflower planting will start when soils warm and dry towards the end of the week. In the northern part of the region about half of the cool season crop acreage is planted. Growers had fertilizer applied to winter wheat ahead of the rain and the crop is looking good at this point. Some alfalfa was frozen back a couple of weeks ago but is recovering nicely. Earliest planted wheat is in the two leaf stage. Wheat and barley planted after April 20 is one leaf or less. Some flax and canola is emerging.
Devils Lake Area Office
During the past week (May 4 to 10), the south-central regionís rainfall ranged from 0.6 inches at Linton to 2.3 inches at Oakes as recorded at NDAWN (North Dakota Agricultural Weather Network) sites. Most of the region received about an inch or more and up to 3 to 5 inches have been unofficially reported. The rain was welcome for crop establishment, as well as, movement of surface-applied nitrogen fertilizer and preemergence herbicides into the soil. The regionís average soil temperature at the 4-inch depth ranged from 47 to 55 degrees F on May 10.
The regionís cool-season crop planting including wheat, barley, field pea, canola, and flax is essentially complete. Planted corn acres range from 50 to 90 percent. Soybean planting is in progress, with about 25 to 50 percent of the acreage planted in counties south of Interstate 94 and about 10 percent complete north of I94. Concern exists for potential injury and yield loss of alfalfa and winter wheat exposed to the early-May cold temperatures (lows in the mid-teens). Wheat planted by April 20 is in the 2- to 3-leaf stage, while the majority of the regionís wheat is emerging to 1-leaf.
Area Extension Specialist/Cropping Systems
NDSU Carrington Research Extension Center