Potato Extension
Blightline August 2, 2013
Late blight has still not been reported in North Dakota, Minnesota or Manitoba. There is an unconfirmed report of late blight in southern Alberta. The late blight severity values in most locations increased the past two days as a result of our cool weather, morning dews and sporadic showers, but late blight severity values low. It is important to continue to scout fields for late blight, especially along tree lines and low areas that may hold moisture longer. The non-irrigated stations that have reached the late blight threshold severity value of 15 are: Ada, Cando, Eldred, Humboldt, Perley, Rolla, Sabin and Warren. The irrigated stations that have reached the late blight threshold value of 15 are: Beach, Hofflund, Inkster, Karlsruhe, Leonard, Linton, Michigan, Minot, Oakes and Robinson. We recommend application of the first protectant fungicide when late blight threshold severity value of 15 occurs, just prior to row closure, or if late blight is found in your area, whichever occurs first.
Aphid Alert for week ending July 29th
The number of aphid vectors recovered at many sites decreased this week, however, with the Sturgis Rally right around the corner, we might expect the Sturgis Dispersal Event (coined by Bruce Potter at the SWROC in Lamberton) to bring us soybean aphids in the next 2 weeks. While the name may seem light-hearted, it does accurately describe roughly the timing of a late season movement of soybean aphids (generally late July / early August) that often bring aphids into northern Minnesota, North Dakota, and Manitoba. Soybean aphids have been recovered from several locations (especially Crookston, MN) for the past 3 sampling weeks. Aphid populations are well-established in the region by now, small grains began have been senescing and the traps at many locations have been recovering cereal aphids for several weeks now.
Blightline July 31, 2013
Late blight has still not been reported in North Dakota, Minnesota or Manitoba. All late blight of potatoes and tomatoes reported this year are east of the Mississippi River, including Wisconsin, Michigan, New York and Maine. Our cool weather has resulted in morning dews that favor late blight infection, and our late blight severity values increased slightly at almost all locations the past two days. The non-irrigated stations that have reached the late blight threshold severity value of 15 are: Ada, Cando, Eldred, Humboldt, Perley, Rolla, Sabin and Warren. The irrigated stations that have reached the late blight threshold value of 15 are: Beach, Hofflund, Inkster, Karlsruhe, Leonard, Linton, Michigan, Minot, Oakes and Robinson. We recommend application of the first protectant fungicide when late blight threshold severity value of 15 occurs, just prior to row closure, or if late blight is found in your area, whichever occurs first. Because of the low late pressure fungicide application intervals can be extended to 10-12 days.
Effect of Glyphosate Residues on Daughter Seed Potato Growth
Seed potato plants exposed to glyphosate can translocate the herbicide to the daughter tubers causing symptoms the following year, including erratic and slow emergence, malformed leaves, multiple shoots from a single eye, and/or enlarged shoots. The purpose of this study was to determine the effect of glyphosate residues in seed pieces on yield.
Blightline July 29, 2013
Late blight has still not been reported in North Dakota, Minnesota or Manitoba. The cool weather has resulted in morning dews that favor late blight infection, but late blight severity values remain relatively low and were essentially unchanged at all locations. The non-irrigated stations that have reached the late blight threshold severity value of 15 are: Eldred, Humboldt, Perley, Rolla and Sabin. The irrigated stations that have reached the late blight threshold value of 15 are: Beach, Hofflund, Inkster, Karlsruhe, Leonard, Linton, Michigan, Oakes and Robinson. Growers should be ready to apply the first protectant fungicide when late blight threshold severity value of 15 occurs, just prior to row closure, or if late blight is found in your area, whichever occurs first.
Protecting Seed Potatoes From Unintended Herbicides
Growing seed potatoes can be challenging, especially with issues of herbicide carryover in seed pieces. This presentation is intended to give information on how seed potato growers can protect their crop.
Blightline July 26, 2013
Current recommendations: Late blight has not been reported in North Dakota, Minnesota or Manitoba. The cool weather has resulted in morning dews that favor late blight infection, but late blight severity values still remain relatively low. The non-irrigated stations that have reached the late blight threshold severity value of 15 are: Eldred, Humboldt, Perley, Rolla and Sabin. The irrigated stations that have reached the late blight threshold value of 15 are: Beach, Hofflund, Inkster, Karlsruhe, Leonard, Linton, Michigan, Oakes and Robinson. Growers should be ready to apply the first protectant fungicide when late blight threshold severity value of 15 occurs, just prior to row closure, or if late blight is found in your area, whichever occurs first. Thank you for using the NDSU Potato Blightline.
Aphid Alert for Week Ending July 21
This season looks to have significant potential vector activity. Complete weekly and cumulative seasonal results can be found at: aphidalert.blogspot.com
Aphid Alert for Week Ending July 5
Early aphid populations in small grains and soybeans indicates this may well be an aphid year! Vigilant scouting and management is very important this season!
MN Area II Potato Growers Field Day July 16, 2013
The Minnesota Area II Potato Growers Field Day will be held on July 16, 2013 at the Sand Plains Research Farm in Becker, MN. The Field Day will begin at 5pm and a dinner will be served after the field demonstrations.
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