Adult potato pysllids have been detected in North Dakota’s potatoes, about one month earlier than 2011 (Source: N. Gumestad, Dept. Plant Pathology, NDSU).
The first sunflower moths of the season were captured in pheromone traps located in Walsh, Ward and McLean County, ND.
Aphids have been observed on canola near Minot in Ward County, Underwood in McLean County, McHenry County and northeast Hettinger County.
The distribution map (shown) depicts the 2012 forecast for populations of wheat midge from the surveyed areas of North Dakota.
The first banded sunflower moth of the season was captured in a pheromone trap located at Mapleton, Cass County, ND. This is about two weeks earlier than last year.
Although safflower is relatively insect-free, larvae of sunflower moth were observed in safflower in central South Dakota near Hayes in Stanley County.
We have received some reports of defoliation by thistle caterpillars in soybeans in Pembina County and in sunflowers in Ward County.
Potato leafhoppers are present in potato and other field crops in North Dakota, and have been reported in other states (Minnesota, Nebraska, Iowa).
Most of the state (except the northern tier) can start collecting leafy spurge flea beetles (1,200 and 1,600 AGDD) for distribution to new field sites (Source: sunflower GDD model from NDAWN).
Soybean aphids have been reported in extremely low numbers from a few locations in eastern North Dakota.
Black cutworms are migratory moths that arrived in North Dakota early this year. Larvae (worms) and feeding damage in corn have been observed in Cass County near Casselton, Arthur and Page.
Spring wheat is advancing quickly with 74% jointed, 30% boot and 10% headed (Source: North Dakota Crop, Livestock and Weather Report, USDA NASS, June 11, 2012).
More reports of alfalfa weevil damage have come in from the west-central (McKenzie and Mercer Counties), south-central (Morton and Grant Counties), and southeast (Richland County) regions of North Dakota. Most producers are cutting early to avoid any yield loss.
Nymphs of aster leafhopper can be found in cereal fields now. In some sporadic locations, populations of aster leafhoppers are increasing. An informative article on aster leafhopper was written by John Gavloski for the Manitoba Insect and Disease Update on June 8, 2012 and is repeated here.
Using the sunflower GDD model from NDAWN, the DD accumulation indicates that scouting for adult flea beetles should begin in most of the southern tier (1,000 DD).
CANOLA: Flea beetle populations are starting to decline. However, it is still important to scout for flea beetles in any late-seeded canola. Most of the early planted canola is 4-6 leaves, which can tolerate and outgrow beetle feeding damage in most situations.
ALFALFA WEEVIL: The DD accumulation for alfalfa weevil as of June 4 indicates that larvae are present in most of North Dakota (371-595 DD) (source: NDSU NDAWN – Applications – Insect Degree Days). See Issue 4 of Crop & Pest Report for more information.
Recent data from the NDSU sugarbeet root maggot (SBRM) fly monitoring program indicates that fly activity increased dramatically during the past 5 days. Major surges in fly activity were observed in some of the traditional hotspots such as Auburn, St. Thomas, and Forest River, ND.
Leafy spurge flea beetles (Aphthona species) are an effective means of controlling leafy spurge in North Dakota. This group of flea beetles is host-specific to the leafy spurge plant, which makes them an ideal biological control choice.
Sugarbeet root maggot (SBRM) fly activity has continued to be fairly low during the past week, but developing hotspots continue to appear throughout the central and northern Red River Valley (RRV).