NDSU Extension - Ramsey County


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July 12, 2010 - Agriculture Column


This weather has made dramatic changes to our cropping world.  We had many fields of soybeans that were yellowing, mostly from water logging, some fields were not but the majority of the fields were from water.  The corn changed from a midget last week to many fields approaching chest high and approaching tasseling.  Growing degree days (GDD’S) are now at 930 units which puts us 58 degrees ahead of normal, winter wheat fields are generally looking very good with not much wheat streak that I could find, small grains look generally o.k. with some fields struggling to make much of a crop if any.  Bean fields really vary with many looking very good and some not so good, however most of our crops are looking much better than last week.  We do need to keep monitoring for fusarium head blight in wheat if not already done.  Applying extra nitrogen for protein enhancement has either gone or is getting very near the end of that period.  A sharp eye is also needed to keep monitoring for the soybean aphid. 



With the localized hot spots for the wheat midge this year, field scouting will be important.  The current DD map indicates that wheat midge emergence is well underway and should be peaking in the northern tier.


Wheat is in the susceptible growth stage (heading to early-flowering) when the wheat midge were at peak emergence in many areas. An insecticide should be applied during heading and when the adult midge density reaches

one midge per four to five wheat heads for hard red spring wheat or one midge per seven to eight heads for durum. A late insecticide application should be avoided to minimize negative impacts on the parasitoid. Wheat midge larvae feed on the kernel and negatively affect yield, grade and quality.



The hot weather (>90F) has not been optimal for soybean aphid reproduction and this has continued to delay any economic field infestations. So, continue scouting soybean fields for soybean aphids until the R6 (full seed) growth stage.



The Fusarium head blight risk maps indicate a only a few areas (in northern tier of ND counties) of moderate risk of infection for moderately susceptible varieties (on July 7). Scattered infected heads have been seen in winter wheat and a few spring wheat fields in the southeast part of ND in fields that flowered about 2-3 weeks ago (see scouting reports above).

Marcia McMullen




Despite the hot, dry weather the last couple of days, late blight has been found in a potato field in northern Walsh County. We now have confirmed cases in southeastern and northeastern North Dakota as well as western and central Manitoba. No late blight has been reported in Minnesota. The symptoms from southeastern North Dakota were observed on the leaflets,  while stem and petiole lesions were predominant in northeastern North  Dakota Late blight is a community disease that has the potential to rapidly get out of control if appropriate actions are not taken and information is not shared. It does not discriminate between process, chip, fresh, or seed growers. If a suspicious sample is found, it should be placed in a plastic bag, kept cool, and brought to the Plant Pathology Department at NDSU for  mmediate confirmation.



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