Some “hotspots” soybean fields are at economic threshold (E.T. = average of 250 aphids per plant, 80% of the plants infested, and increasing populations) and will be or have been sprayed with insecticide for soybean aphid control.
Pheromone traps monitored by the IPM Survey scouts are capturing increasing numbers of banded sunflower moths (BSM) located in Cass and Foster Counties of North Dakota last week
This week’s Good Bug Corner featured insects are parasitic wasps in the insect family Braconidae.
Continue scouting for soybean aphids during the R1 (early flowering) to R5 (early seed) crop stages. The IPM scouts in North Dakota and Minnesota found soybean aphids in 71% of the soybean fields surveyed during the time from June 29 to July 11.
This week’s Good Bug Corner featured insects are ground beetles in the family Carabidae.
Sunflower heads damaged from sunflower seed maggot, Neotephritis finalis, are being observed in some sunflower fields near Mandan.
The IPM Survey scouts captured the first banded sunflower moths in pheromone traps located in Richland, Ramsey and Cavalier Counties of North Dakota last week.
Armyworms are becoming a concern in maturing wheat and barley fields in Cass, Grand Forks and Steele Counties of North Dakota.
This week’s Good Bug Corner featured insect is Megarhyssa atrata, in the family Ichneumonidae.
The degree-day model (NDSU North Dakota Agricultural Weather Network website) indicates that 50-90% of the females have emerged and are flying.
Time to start scouting for soybean aphids.
This week’s Good Bug Corner featured insect is the ambush bug, Phymata sp., in the family Reduviidae.
Using the sunflower GDD model from NDAWN, the accumulated growing degree days (AGDD) for leafy spurge flea beetles indicate that we can collect flea beetles (AGDD = 1,200 to 1,600) throughout the state.
Several field reports of low numbers of wheat stem sawfly adults flying in wheat have been received from NC (Ward-Mountrail Counties between Max and Parshall), NW (McKenzie County) and SW (Sioux County) areas of North Dakota (IPM survey data).
Soil samples in North Dakota indicate decreased levels of overwintering wheat midge larvae (cocoons) for the 2015 season.
What you need to know about Colorado potato beetles.
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.