Morris, MN, Friday, July 10, 2009
The hot windy weather this past weekend may have caused some wind burn damage to just emerging leaf tips. The symptoms look a lot like the damage from contact herbicide or fertilizer burn.
Northwest Minnesota continues to be plagued by excess precipitation. Consequently many field or lower lying portions of fields are repeatedly flooding or are - at a minimum - completely waterlogged. Flooding and water logging causes a rapid depletion of oxygen in the root zone.
Bacterial leaf stripe is a disease that can usually be found on wheat in the Red River Valley (RRV) later as crop growth stages progress. The disease can develop and become severe rapidly after the crop reaches the heading growth stage.
There have been some reports of bird cherry-oat aphids in small grains in NW and WC MN over the last week. The populations are at low numbers, but it’s still a good idea to scout for aphids in small grains.
There could be about 70% of the region’s wheat acres at the heading stage when wheat midge are emerging, based on those acres being planted in the high risk window. Heading is the growth stage when wheat is attractive to female midge for egg laying, and the time the plant is most susceptible to injury from midge larval feeding.
For those growers unable to apply glyphosate to Roundup Ready sugarbeet for the first time due to wet soil conditions, apply the maximum rate of glyphosate allowed. The maximum glyphosate rate for Roundup Ready sugarbeet is 1.125 pounds acid equivalent per acre (lbs ae/A).
In the past few years, the use of foliar fungicide on corn has gained considerable attention. In 2008, research was conducted in southern Minnesota at Lamberton and Waseca to determine how planting date impacted corn response to foliar fungicide.