Friday, August 1, 2014

So you don't like counting aphids

Here is an overview of "Speed Scouting" for soybean aphid that was written in 2012. The information is helpful if you don't like counting aphids but still want to make an assessment of what is happening with aphids and whether treatment is economically justified.

Thursday, July 31, 2014

Soybean Aphid migration, colonization and infestations underway!

Soybean aphid migration is underway in NW Minnesota. Scouting indicates winged aphids are being found in fields. In some fields, the small infested hot spots (3-4 row feet of heavily infested plants) are more readily detected.

Scouting fields needs to begin in earnest to determine where your fields are in the process. The following link will take you to a refresher on aphid biology, scouting and treatment decision making.

http://www.extension.umn.edu/agriculture/soybean/pest/docs/soybean-aphid-scouting.pdf

More updates as this progresses . . .

Tuesday, July 22, 2014

Preharvest Management Options for Wheat

Winter wheat, if not already there, is quickly approaching physiological maturity. The earliest seeded spring wheat is soon to follow. And thus, it is time to evaluate your pre-harvest management options. Follow this link to read a quick review of your options.

Although there are very persistent assertions, pre-harvest glyphosate - when applied according to the label - should not result in changes in grain protein. A summary of a study to debunk this myth can be found here

HRSW varieties differ for their resistance to pre-harvest sprouting. This high-temperature dormancy peaks at physiological maturity. Repeated wetting and drying of the grain in a swath or even while standing will degrade this dormancy over time. The dormancy of some varieties break down sooner than other, potentially resulting in sprout damage. Click here to look up the ratings for the current HRSW varieties. The best remedy to avoid pre-harvest sprout damage is to harvest timely, even if that means that you are above 13.5% grain moisture content

Finally, many wheat fields are showing tall off-types. Click here for the reasons tall off-types appear in spring wheat. Varieties that are notorious for off-types are Mayville, LCS Albany, and Rollag.

Thursday, July 17, 2014

Soybean Aphid Scouting Reports from NW Minnesota




Soybean Fields scouted 7/14 - 22/2014
Begin scouting fields to establish where your soybean aphid field infestations are at this time. Here is a captured image from Google maps showing our first soybean field scouting reports from around the southern end of NW MN. Most of our scouting detected no infestations based on random plant selection/scouting. Aphids have been found in fields, but the numbers have been well below treatable populations.
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Updates: 
July 17, 2014
Scouting activities did find a field (indicated by red marker) with low level of aphids on Thursday, July 17. Plants with aphids on them represented ~30% of the plants inspected (~70% had "0" aphids). When aphids were found, numbers were well below 20/plant. 

July 22, 2014
Scouting in the Underwood, MN area. Aphids were observed in fields, but the infestations were generally light. Plants with aphids present accounted for under 25% of those sampled. When aphids were found, they numbered less than 10 aphids/plant. One sampled plant had ~40 aphids; no other "hot spots" in the field were noticeable. In other words, still quiet though aphids are out there. 
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Monday, July 14, 2014

2014 Sugarbeet Plot Tour Schedule

There are numerous plot tours scheduled around the region that will focus on sugarbeet pest management relating to Weeds, Insects and Disease. For a full listing of dates, topics and locations (plus directions to sites), open and print the attached document.

2014 Sugarbeet Plot Tours (*PDF document)

Friday, July 11, 2014

Fusarium Head Blight (Scab) Forecasting Models

The recent windy days and reduction in extended moisture events has reduced scab risk based on the forecasting models. However, if frequent moisture events and high relative humidity occur, scab risk will increase quickly.  

Bacterial Leaf Streak in Wheat

Prepared by Dr. Andrew Friskop, Extension Plant Pathologist, NDSU

Last week the IPM survey scouts recorded bacterial leaf streak (BLS) in a few wheat fields. Additionally, I noticed BLS showing up in one of my wheat trials on campus. Given these observations, I feel it is important to review information on BLS.