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Andy Robinson

Potato Extension Agronomist

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Potato Extension

Late Blight Confirmed in North Dakota

Late Blight Confirmed in North Dakota

Late blight was confirmed in a potato sample on Thursday July 27 from Pembina County, North Dakota. The genotype is not yet known. Conditions have been favorable for late blight spread and infection, and growers in this area should apply a late blight specialty fungicide immediately. All growers in northeast North Dakota and northwest Minnesota should scout potato fields for late blight and be ready to apply late blight fungicides.

Late Blight Confirmed in North Dakota - Read More…

The Impact of Dicamba Herbicide on Potato Yield, Quality, and Seed Viability

The Impact of Dicamba Herbicide on Potato Yield, Quality, and Seed Viability

The presentation explains the effects dicamba has on potato leaves, tubers, and seed when planted back. Dicamba is a translocating herbicide that will express injury in the growing points of plants. When a low dose of unintended herbicide comes in contact with a sensitive crop, such as potato, the results can be devastating for the potato plant and tubers. New leaves become twisted, cupped and malformed, while tuber number can be reduced and malformed.

The Impact of Dicamba Herbicide on Potato Yield, Quality, and Seed Viability - Read More…

Aphid Alert (July 14)

Aphid Alert (July 14)

Looks like it might be turning into an aphid year. We saw high trp catches at some locations this week and we're seeing a lot of diversity in the species being captured. Six sites this week had trap catches containing more than 20 vectors of varying efficiencies: Humboldt (35), Ada (41), Crookston (49), Sabin (25), and Brooks (39) in MN and Hoople (26) in ND. However, Green peach aphid (the most efficient vector) was recovered from traps in Perham, Crookston, Sabin, and Brooks.

Aphid Alert (July 14) - Read More…

Blightline July 17, 2017

Blightline July 17, 2017

No late blight has been reported in ND, MN or MB. Late blight has been reported in central WA (US8) and in MI (US23). Late blight severity values accumulated in the northern half of the Red River Valley in both MN and ND. Many areas have reached or exceeded the late blight threshold value of 15. This indicates that conditions have been favorable for late blight infection if inoculum is present. A protectant fungicide should be applied when the threshold value reaches 15 or just prior to row closure, whichever occurs first. It continues to be important to scout for late blight in those areas where the threshold has been reached concentrating on areas of the field that stay wet longer such as along tree lines and low areas where water accumulates.

Blightline July 17, 2017 - Read More…

Helping Growers Manage Potato Psyllids & Zebra Chip in the Columbia Basin of Washington State

Helping Growers Manage Potato Psyllids & Zebra Chip in the Columbia Basin of Washington State

This presentation explains efforts to help Washington’s potato industry manage potato psyllids and zebra chip disease. It describes a regional insect monitoring program and pest alert system in the Columbia Basin of Washington. Viewers from all potato-growing regions will learn more about zebra chip disease and its vector, the potato psyllid. This includes descriptions of 1) psyllid life stages and how each can be monitored in potato fields; 2) how zebra chip is spread by psyllids; and 3) psyllid yellows disorder caused by potato psyllid nymph feeding. The presentation includes a review of zebra chip incidence in the Columbia Basin in the six years since it was first detected in the region. It also explains what has been learned about psyllid overwintering in the region and seasonal dispersal. Insecticide recommendations for managing potato psyllids and zebra chip in the Columbia Basin are described.

Helping Growers Manage Potato Psyllids & Zebra Chip in the Columbia Basin of Washington State - Read More…

Potato Growth and Development

Potato Growth and Development

This presentation will help consultants, growers and other practitioners in North America understand potato growth and development as it impacts yield and quality. Specifically, this presentation will focus on key growth stages in crop development, and how management practices can impact each of those stages.

Potato Growth and Development - Read More…

Blightline July 5, 2017

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.

Blightline July 5, 2017 - Read More…

What Is the Source of Potato Psyllids Colonizing Potato Fields in the Pacific Northwest?

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.

What Is the Source of Potato Psyllids Colonizing Potato Fields in the Pacific Northwest? - Read More…

Potato Association of America 2017 Program

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.

Potato Association of America 2017 Program - Read More…

Aphid Alert now available

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....

Aphid Alert now available - Read More…

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