Based on the accumulated growing degree days, most of North Dakota is past or at peak feeding (or 504 - 595 AGDD) when larvae are in the 3rd to 4th instars.
This week’s Good Bug Corner featured insect is the spined soldier bug, Podisus maculiventris, in the family Pentatomidae (or stink bugs).
Find out where to check the growing degree days for leafy spurge flea beetles.
Insecticide seed treatments are not controlling late season wireworm populations in sunflowers.
Cereal aphids continue to be found at very low incidence. IPM Scouts scouted 83 wheat and 38 barley fields and found cereal aphids in only 11 fields or 8% of fields surveyed.
This year’s sugarbeet root maggot (SBRM) fly monitoring program suggests that SBRM populations are at the highest levels they have been in the past 10 years.
Fifty-eight percent of the barley is in the jointing crop stage in North Dakota (USDA NASS, ND – June 15, 2015) and susceptible to damage from barley thrips.
IPM Scouts scouted 35 soybean field last week and one field had a soybean aphid present in Richland County, only 1% of plants infested with one aphid per plant.
Several calls are coming in about collecting leafy spurge flea beetles.
The southeast area of North Dakota has accumulated enough degree days (DD) for the major leaf feeding stage (504 to 595 accumulated DD) by weevil larvae.
With all the rain this spring, blood-sucking mosquitoes are swarming and aggressively biting livestock in pastures.
Reports on Canola and Field Pea included
Our first cereal aphids were detected in McHenry County in the NC area of North Dakota at sub-economic level, 14% incidence, on durum wheat by the IPM Scout, Jacee Aaseth. Scouting over the next month will be important for the wheat (spring, durum and winter), oat and barley.
This week’s featured bug is the syrphid fly or hoverfly (Diptera: Syrphidae). There are about 1,000 species of syrphid flies in North America, and are common in field crops.
Although sugarbeet root maggot (SBRM) fly activity is currently at low levels throughout most of the Red River Valley (RRV), all indicators thus far suggest that some sites within the Valley will experience very high populations this year.
The first sugarbeet root maggot (SBRM) flies of the season were observed on Tuesday, May 26 in a field near St. Thomas, ND.
This week’s featured is the green lacewing (Chrysopa species). The adult is a beautiful 1 inch long, green insect with 2 pair of clear, network-like wings, and large golden to red eyes.
Insect pest updates on canola, alfalfa, wheat, and field peas.
This week’s featured group is beneficial wasps (also called parasitoids) that attack and kill eggs and immature stages of many insect pests. Parasitoids are described as tiny wasps in the insect order Hymenoptera and include many different families (Braconidae and Ichneumonidae, for example).
Since the cold temperatures have slowed insect pest activity this past week, I thought this would be a good opportunity to update you on the status of a few invasive insect pests of field crops. Please look for these invasive insect pests when you are out scouting fields or around your home.