A degree-day model is a good predictor of wheat midge emergence for timing field scouting.
Low numbers of pea aphids, only 1 per sweep, are being found in field peas in Mountrail, Divide and Williams counties, and in lentils in Williams and McKenzie counties
Soil samples in North Dakota showed low levels of overwintering wheat midge larvae (cocoons) for the 2016 season.
Accumulated growing degree days (AGDD) from NDAWN (sunflower degree days/growth stage application) indicated that leafy spurge flea beetles are getting close to 1,200 when flea beetles should be collected between 1,200 and 1,600 AGDD.
Adult Colorado potato beetles are emerging from overwintering sites.
If you see any of these insects, please contact your local county extension office, the North Dakota Department of Agriculture or one of the authors listed below. Thank you
Larvae of the diamondback moth and imported cabbage moth have been observed on canola fields near Langdon in Cavalier County.
The noxious weed, leafy spurge, is flowering in ditches and pastures.
In North Dakota, wheat curl mites are being found in spring wheat and winter wheat samples.
Sugarbeet root maggot (SBRM) fly activity has increased significantly in the past couple of days, and by the time this report is published, activity levels will have peaked in the southern and central Red River Valley (RRV).
Field reports from Minnesota (MN) indicate that cereal aphids are become more common and abundant in winter wheat and spring wheat in southern areas of MN, but not the central and northern areas of MN (Source: P. Glogoza & B. Potter, UMN, pers. comm.)
Sugarbeet root maggot (SBRM) fly activity is currently at low levels throughout most of the Red River Valley (RRV); however, several sites within the Valley will experience very high populations this year.
This insect (life stage) was observed in garden soil in Burleigh County.
IPM Scouts have observed very low numbers of grasshopper nymphs (only 1 nymph per square yard) that have just hatched in field ditches in Cass and Barnes counties in SE ND.
Recent periods of relatively warm temperatures in the Red River Valley (RRV) have likely accelerated development of overwintered sugarbeet root maggot (SBRM) larvae.
Numerous calls/emails on crops (winter wheat, hard red spring wheat, field pea, and sugar beets) damaged by wireworms have been received over the past weeks, especially in crops in no-till systems.
EPA has open a comment period on Transform®/Closer®/Sequoia® with Isoclast® insecticide (a.i. sulfoxalfor) from Dow AgroSciences until June 17th.
Based on May 17th degree day accumulations (see map below) for alfalfa weevils in North Dakota, adult weevils are emerging.
In addition to last week’s detection of cereal aphids in SE area of North Dakota, low densities of cereal aphids were detected in Minot in NC area.
Crucifer and stripped flea beetles have emerged from overwintering sites in shelterbelts and have been observed in canola fields in Langdon and Minot .