Barley thrips have been found in Ward, Cass, and Linton Counties and central ND near Rugby. Some fields have high numbers of barley thrips (>5 thrips per stem) while other fields are still low in numbers (0-3 thrips per stem).
Tick season is well underway, and we have received several samples from area clinics and the general public.
Soybean aphids can be washed off soybean leaves and killed during heavy rain events, especially when plants are still in the vegetative stage and there is little canopy closure.
Hessian fly was observed in spring wheat plantings at the Langdon REC (Source: Dr. Gautam, LREC). Hessian fly is an occasional insect pest problem of wheat in North Dakota.
Cereal aphids (mostly English grain aphids) have been reported from small grains in SW, SC and WC MN, and from SE, EC and NC ND (Sources: IPM Scouts for ND and MN, and Dr. Chapara at NCREC, Minot, ND).
Significant increases in sugarbeet root maggot (SBRM) fly activity have been observed at several of our monitoring sites in the past few days.
Cereal Aphids: Incidence of cereal aphids is generally still low and ranged from 0 to 29% this past week. Alfalfa Weevils: Larger larvae (≈⅜ inch) are being observed in alfalfa now. Flea Beetles: Some canola fields in Langdon and Minot areas are being treated with foliar rescue insecticides for needed protection against flea beetles.
Aster leafhoppers, Macrosteles quadrilineatus, have arrived in low numbers in North Dakota.
The NDSU IPM Scout in the northeast region of North Dakota found one field in Cass County with soybean aphids.
Sugarbeet root maggot (SBRM) fly activity is being monitored this year in a collaborative project between NDSU Entomology, American Crystal Sugar Company, the MinnDak Farmers Cooperative, and the Pembina County (ND) Extension office.
Insecticidal seed treatments for canola may not be giving adequate protection this year due to the cool, wet weather we have been experiencing, especially in the northeastern part of the state.
Extension entomologists have reported soybean aphids in southern Wisconsin, northeast Iowa, Illinois, Indiana, Michigan and Ohio. Soybean aphids (<10% incidence and < 9 aphids/plant) were just detected in Minnesota on June 11 near Rosemount (Source: R. Koch, UMN). No soybean aphids have been reported in South Dakota.
County Extension Agents and fields scouts are observing adult alfalfa weevils, small larvae (<⅛ inch), and small holes in the foliage of alfalfa.
The U.S. Department of Agriculture (USDA) and the U.S. Environmental Protection Agency (EPA) today released a comprehensive scientific report on honey bee health. The report states that there are multiple factors playing a role in honey bee colony declines, including parasites and disease, genetics, poor nutrition and pesticide exposure.
The IPM Scouts have detected cereal aphids and grasshopper nymphs in southern North Dakota. This is a good time to intensify your scouting efforts for cereal aphids in wheat, durum and barley, and for grasshoppers in any crop.
The first detections of sugarbeet root maggot (SBRM) flies by NDSU personnel occurred last week near Thompson and Reynolds, ND in the central portion of the Red River Valley (RRV).
Japanese beetle adults were found at several locations in North Dakota in 2012, including Fargo, West Fargo, Grand Forks, Bismarck, Minot, Oakes, Taylor and rural Foster County.
The brightly colored red velvet mites have been observed crawling around on the soil of fields. These mites belong to the mite family Trombidiidae.
Cool, wet weather is not favorable for grasshoppers and causes increased disease and mortality. Grasshopper hatch is usually underway by now, but the cool temperatures have delayed hatching. If you see the common lilac beginning to bloom, this is an indicator of when grasshopper emergence should be starting.
Cereal aphids have been detected in fields from Fergus Falls to Morris and in southwest Minnesota at low densities of 3-5 aphids per plant and <35% incidence (Sources: B. Potter, D. Holen and P. Glogoza, UMN).