Flea beetles have emerged in large numbers with the warm, sunny days. Significant feeding injury (>50% defoliation) and stand loss are being observed in Bottineau, Rolette, Towner, Cavalier, Ramsey, Walsh, and Dunn Counties, especially on the early-seeded canola (before mid-May).
Several calls have come in about these giant mosquito-like insects.
Due to the recent hot weather, adult alfalfa weevils are emerging and have been observed in the southern regions and north central regions of North Dakota (sources: V. Chapara, NCREC).
Alfalfa weevil was a major pest problem in forages last year, especially in the southwest and south-central regions of North Dakota.
Most of the bare / turf soil temperatures are still below 50 degrees F for most of North Dakota.
With warmer spring weather, tick season is upon us.
In a pocket of non-Bt corn production, European corn borer damage was found to be at high levels in the North Central Region of North Dakota. Out of 100 plants scouted in a “Z” pattern, 20 plants were found infested with European corn borer larvae.
Sugarbeet root aphid (SBRA) infestations have been reported as occurring in several sugarbeet fields in the Red River Valley during the past few weeks.
Winged soybean aphids were observed moving to buckthorn (Rhamnus spp), a small woody shrub. Buckthorn is common in our shelterbelts and woods in North Dakota.
WASHINGTON – In an ongoing effort to protect bees and other pollinators, the U.S. Environmental Protection Agency (EPA) has developed new pesticide labels that prohibit use of some neonicotinoid pesticide products where bees are present.
The new generation of adult flea beetles is emerging and feeding on developing pods of canola. This is the overwintering generation that will emerge next spring.
Sap beetles (or picnic beetles) have been observed feeding and damaging corn ears. One of the most common sap beetles is Glischrochilus quadrisignatus, which is ¼ inch long, black with four orange-red spots on the wing covers and has “knobbed” antennae. Adult sap beetles feed on decaying, ripening plant material.
This time of year, adult grasshoppers start to move around and feed on late-season row crops, such as sunflowers, corn, dry beans, soybeans or flax.
Continue scouting for soybean aphids and spider mites in soybeans.
Black blister beetles (Epicauta pensylvanica) were observed damaging blossoms and clipping stems of alfalfa regrowth (after cuttings) in McIntosh County. As long as the blister beetles are not feeding directly on the crowns and destroying >50% of crowns, the alfalfa should be able to compensate next spring for loss growth.
The spotted-wing Drosophila, Drosophila suzukii, was detected in a cherry fruit sample from the Carrington Research Extension Center that was submitted to the NDSU Plant Diagnostic Laboratory and identified by Patrick Beauzay.
Egg masses of European corn borer have been found in the North Central Region of North Dakota, near Mohall (Source: V. Chapara, NCREC, Minot).
The key to good grain storage is anticipating and preventing potential problems through good bin management. Before treating with an insecticide protectant, make sure that the bins are free of insect-infested grain.
Chemical treatment is directed at the larval stage of the banded sunflower moth, which is the actual damaging stage. The 2013 economic threshold for the Banded sunflower moth is only one moth per 100 plants due to the high market value of oilseed sunflowers. Please see the article on “Sunflower Insects Emerging” in the Crop & Pest Report #10, July 11, 2013 for more details on banded sunflower moth thresholds.
Northern corn rootworm adults are emerging and teneral adults (soft exoskeleton and not fully colored) were captured in our emergence traps near Arthur, Cass County, on Friday, July 26th.