Potato Extension
Blightline July 5, 2017
No late blight has been reported in ND, MN or MB. Late blight severity values continue to accumulate, particularly in the non-irrigated locations in the northern Red River Valley production area. Many areas are approaching the late blight threshold value of 15 indicating that conditions have been favorable for late blight infection if inoculum is present. A protectant fungicide should be applied before the threshold value reaches 15 or just prior to row closure, whichever occurs first. The hot weather predicted for this week will not be favorable for late blight.
What Is the Source of Potato Psyllids Colonizing Potato Fields in the Pacific Northwest?
The outbreak of zebra chip disease in potato fields of Washington, Oregon, and Idaho in 2011 has led to substantial disruption of established IPM programs in potatoes. Managing zebra chip disease requires controlling potato psyllid, the insect which vectors the bacterium causing the disease, and uncertainties in understanding biology of potato psyllid in the Pacific Northwest has forced growers to rely on calendar-based applications of insecticides to prevent establishment of infective psyllids in their fields. This presentation will examine the possible role of two non-crop host plants of potato psyllid – bittersweet nightshade and matrimony vine – as possible “bridge” hosts between late winter emergence of potato psyllid from overwintering quarters and late spring emergence of the potato crop. Understanding psyllid biology on non-crop plants in the Pacific Northwest will allow growers to better predict when seasonally and in what fields potato psyllid is likely to first arrive.
Potato Association of America 2017 Program
The Potato Association of America is a non-profit organization dedicated to improving potato health and utilization world-wide. Our more than 500 members work to actively promote all aspects of potato production, utilization, biology and breeding. The annual meeting will be in Fargo, ND on July 23-27, 2017 at the Fargo Holiday Inn.
Aphid Alert now available
UPDATE - 7 more sites reported in this week - Ada had a big capture and Green peach aphids have also now been recovered in Ada and Hoople. This gives us 3 sites so far this year that have recovered Green peach. It's still early days but it's looking like we might be in for an aphid year....
Blightline June 26, 2017
No late blight has been reported in ND or MN. Late blight severity values continue to accumulate slowly.
Blightline June 20, 2017
No late blight has been reported in ND or MN. Late blight severity values are just beginning to accumulate, particularly in northeast North Dakota.
Colorado Potato Beetle Update
Several different locations in the Red River Valley are experiencing emerging Colorado potato beetles. Here is some information from Dr. Ian MacRae on this emerging issue.
Welcome to Blightline 2017!
Welcome to the first NDSU Potato Blightline for 2017 sponsored by Syngenta Crop Protection. We are up and running for the 23rd consecutive year of operation. The Blightline includes disease forecasting and control recommendations for late blight and early blight, and other potato disease and insect information on a local and national basis. The Blightline is updated weekly, or more often if late blight is present, through mid-September.
Controlling Volunteer Potato Plants
Volunteer potato plants are emerging in North Dakota and have been found in soybean and corn fields. Volunteer potatoes are a susceptible host for late blight, because they are not continually treated with fungicides. How can you control volunteer potato plants?
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