Potato Extension
Aphid Alert August 17
Another week with high aphid pressure. We are seeing more green peach aphid across many sites including a whopping 18 from the Sabin trap! Soybean aphid numbers are still high. Several locations have risk indices in the double digits: Ada, Perham, Sabin, and Tappen.
NPPGA Field Day August 20th
North Dakota State University and University of Minnesota potato research will be highlighted during the Northern Plains Potato Growers Association field day on Thursday, Aug. 20. This year, the field day tour will travel to three locations. The day will begin at 7 a.m. with breakfast at Hoverson Farms near Larimore. Research presentations will begin at 8:15 a.m. Lunch and research presentations will be at the Forest River Colony near Inkster at noon. Also scheduled is a field tour of the irrigated research trials. The last stop will be at Oberg Farms near Hoople starting at 5 p.m. The final stop will include research presentations and an evening barbecue.
Blightline August 12
No late blight has been reported or confirmed in our region of ND, MN or MB. We have not even had a suspicious sample submitted. Late blight has been reported in potatoes in Box Butte County, NE. The recent hot and dry weather has resulted in conditions unfavorable for late blight. Growers are encouraged to continue to apply protective fungicides for early and late blight control, as weather conditions can change quickly. Morning fog and dew are beginning to appear, and these can contribute to free moisture need for late blight infection. Continue to scout fields for late blight, concentrating in areas that are wet longer such as low areas, near shelterbelts or around pivot wells.
Blightline August 3
No late blight has been reported or confirmed in our region of ND, MN or MB. Late blight has been reported in potatoes in MI and IN. Growers are encouraged to apply a protective fungicide such as chlorothalonil or mancozeb on a 7-10 day schedule, and scout fields for late blight, concentrating in areas that are wet longer such as low areas, near shelterbelts or around pivot wells. Send suspect samples to us at NDSU for confirmation or denial of late blight. Remember that late blight is a community disease and the potato neighborhood needs to know when late blight is present so it can be fought collectively.
Blightline July 17, 2015
No late blight has been reported or confirmed in our region of ND, MN or MB. Late blight has been reported in potatoes in the provinces of Alberta and Ontario, and additional late bight has been reported in potatoes in Adams, Waushara and Wood counties in Wisconsin. Late blight severity values in our regions have increased dramatically this week due to the frequent thunderstorms and high humidity. All irrigated and non-irrigated locations have now reached late blight severity values of 15. At this threshold value of 15, accumulated conditions are conducive for late blight if inoculum is present. Growers are encouraged to apply a protective fungicide such as chlorothalonil or mancozeb, and scout fields for late blight, concentrating in areas that are wet longer such as low areas, near shelterbelts or around pivot wells.
MN Potato Field Day
The MN Area II Potato Field Day will be held at the Sand Plains Research Farm in Becker, MN. The field tour will consist of viewing entomology, fertility, breeding, and agronomic research. Dinner will be provided by Everris.
Blightline July 10, 2015
No late blight has been reported or confirmed in our region of ND, MN or MB. Late blight has been reported in potatoes in the states of CA, CO, FL, NH, NY, PA, TX, WA and WI in 2015. Late blight severity values in our regions have stabilized the past two days. Most irrigated locations have reached late blight severity values of 15, including Beach, Inkster, Karlsruhe, Leonard, Linton, Mandan, Michigan, Minot, Oakes, Robinson and Tappen. The non-irrigated locations of Ada, Humboldt, Rolla, Sabin, St. Thomas, Stephen and Warren have also accumulated 15 severity values. At this threshold value of 15, accumulated conditions are conducive for late blight if inoculum is present; growers are encouraged to apply a protective fungicide such as chlorothalonil or mancozeb.
Blightline July 8, 2015
No late blight has been reported in our region of ND, MN or MB. Late blight has been reported in potatoes in Morgan County, CO. The genotype is US8, which was first reported in 1995, has been found only rarely in recent years. Late blight severity values in our area continue to accumulate. Most irrigated locations have reached late blight severity values of 15, including Beach, Inkster, Karlsruhe, Leonard, Linton, Mandan, Michigan, Minot, Oakes, Robinson and Tappen. The non-irrigated locations of Ada, Humboldt, Rolla, Sabin, Stephen and Warren have also accumulated 15 severity values. At this threshold value of 15, accumulated conditions are conducive for late blight if inoculum is present; growers are encouraged to apply a protective fungicide such as chlorothalonil or mancozeb.
Signs of Metribuzin Damage in Potato
Metribuzin applied to potatoes postemergence can cause chlorosis of the veins for a variety of reasons. It can be that cultivars are more sensitive to the herbicide, or the environmental conditions promote slow metabolism, or the soil conditions make metribuzin more active. Knowing these things will help ensure crop safety when using metribuzin.
Blightline July 1, 2015
No late blight has been reported in our region of ND, MN or MB. Late blight has been reported in potatoes in Adams County, and more recently in Waushara County,WI. Late blight has been reported in potatoes in Franklin County, WA. The genotypes have not yet been identified. Late blight severity values in our area have stabilized somewhat are accumulating slower. Several irrigated locations have reached late blight severity values of 15, including Beach, Inkster, Leonard, Linton, Michigan, Oakes and Robinson. At this threshold value, accumulated conditions are conducive for late blight if inoculum is present; growers are encouraged to apply a protective fungicide such as chlorothalonil or mancozeb.
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