Potato Extension
Blightline July 11, 2014
No late blight has been reported in our region. Late blight severity values have generally stabilized, especially the non-irrigated sites. The cool weather forecast for next week is favorable for late blight. If severity values in your area have accumulated to 15, application of a protectant fungicide such as mancozeb or chlorothalonil is recommended. Many sites have reached this threshold. Late blight has not been found in MI as reported on Tuesday, but just across the border in Indiana. Late blight has been found in Cumberland County, Maine.
Blightline July 8, 2014
No late blight has been reported in our region. Late blight severity values continue to accumulate, particularly in the northeastern quarter of ND. All stations in this have reached the late blight threshold of 15 and conditions are favorable for late blight to develop if inoculum is present. Application of a protectant fungicide such as mancozeb or chlorothalonil is recommended. A protectant fungicide should be applied just before row closure or when late blight severity values reach 15.
Blightline June 30, 2014
Severity values are at or over 15 at the following NDAWN sites: Rolla 22, Cando 19, Langdon 23, Cavalier 16, Grafton 16, Forest River 19, Michigan 18, Crary 16, Robinson, 15 and Stephen 18. Many other locations are close to 15.
Blightline June 23, 2014
Late blight severity values are between one and four throughout our entire region This indicates a low level of late blight risk, but continuing cool and wet weather will result in further accumulation of severity values. To date, no late blight has been reported in our region.
Aphid Alert 2014
Dr. Ian MacRae's Aphid Alert II is up again for another season of finding the aphid vectors of PVY and letting you know where and how many there are in the region. The first week's suction trap catch is available now. Find all the info at: aphidalert.blogspot.com or aphidalert.umn.edu
Blightline June 16, 2014
Only a few late blight severity values have accumulated in some irrigated sites so far this season. The risk of late blight now is low, but continuing cool and wet weather is favorable for late blight. No late blight has been reported in our region. Preventing first sources of late blight is a critical part of late blight management. These sources of initial inoculum are culls, volunteers and seed. Infected seed can be an early source of late blight inoculum, so it is important to scout fields for late blight early and all season.
Heat Crinkle
Emerging Russet Burbank under heat stress can result in a phenomenon we call heat crinkle. It may look like herbicide damage, but the chlorotic and crinkling leaves are a result of the shootings being exposed to high temperatures in the hill as they are growing through that zone. The high temperatures cause cell damage resulting in some shoots loosing apical dominance and leaf crinkle.
NDSU Potato Blightline for June 10, 2014
No late blight severity values have accumulated so far this season. The risk of late blight now is low, but continuing wet weather during the season will provide conditions favorable for late blight. Preventing first sources of late blight is a critical part of late blight management. These sources of initial inoculum are culls, volunteers and seed. Infected seed can be an early source of late blight inoculum, so it is important to scout fields for late blight early and all season.
NDSU Potato Blightline for June 2, 2014
Welcome to the NDSU Potato Blightline for June 2 sponsored by Syngenta Crop Protection. We are up and running for the 20th 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 every Monday, Wednesday and Friday until mid-September. Information and recommendations are available anytime through the toll free number 1.888.482.7286 and the NDSU Potato Late Blightline at www.ndawn.ndsu.nodak.edu
Factors That Cause Sugar Ends in Potatoes
This presentation will help consultants, growers and other practitioners in North America understand the development of the physiological disorder called “sugar ends” in processing potatoes. Specifically, this presentation will focus on key stress factors associated with the development of sugar ends, and the management practices that help reduce this disorder.
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