Crop & Pest Report
Adult Colorado potato beetles are emerging now from overwintering sites. The adult is 3/8 inch long, with oval body and a yellow-brown with 5 black stripes on each wing cover.
The updated degree day map for leafy spurge flea beetles (Aphthona species) indicates that land managers can scout and/or collect adult flea beetles in North Dakota, based on the sunflower GDD model from NDAWN.
An isolated Hessian fly infestation was found in Syngenta’s hard red spring wheat variety trial near Beach in SW ND.
Maps detailing corn accumulated daily growing days, percent normal rainfall, departure from normal average air temperature, and accumulated wheat growing degree days.
Most areas of Eastern North Dakota and Minnesota have received excessive amounts of rainfall in June.
Weeds continue to emerge and are actively growing in sugarbeet fields in Eastern North Dakota and Minnesota as a result of recent widespread precipitation.
This may possibly be the most important Crop and Pest Report article (weeds) written in the 2014 cropping year.
On my way to and from Devils Lake today, nearly every field of soybean had symptoms of iron deficiency chlorosis (IDC). Therefore, a short review is in order.
I have stated at many meetings that the high clay soils in the Red River Valley are high enough in organic matter and have a high enough sulfatic water table that sulfur fertilization is not needed. However...
The row crops in our region look as poor now as in 2011, our last perpetually wet spring.
With prevented planting (PP) more common throughout North Dakota, using cover crops to prepare the land for next year is a desirable option.
Crop scouts are reporting low incidence of canola blackleg in Bottineau County.
Early planted barley is approaching the stage of greatest risk for Fusarium Head Blight infection (scab). Spring wheat is not far behind.
Using the scab risk models from NDSU and the FHB prediction center, scab risk for very susceptible varieties remains moderate to high for a majority of the state.
The scouts visited 158 wheat fields and 22 barley fields last week.
The last two weeks remind us of the planting conditions last year. Although not as severe, many areas in the Red River Valley that have been planted have received a high amount of precipitation.
Increased numbers of diamondback moth larvae are being found in canola fields in McLean County near Roseglen, and Mountrail County near Parshall.
Aster leafhoppers were detected in only 29% of the canola field surveyed from June 16-20 and continue to be at very low densities (0 to 25 leafhoppers per 9 sweeps) in canola in North Dakota and Minnesota.
Most of the alfalfa is being cut or has been cut in the southeast region of North Dakota, and has escaped major defoliation from alfalfa weevil feeding.