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Andy Robinson

Potato Extension Agronomist

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Potato Extension

Aphid Alert week of Aug 22-26

Aphid Alert week of Aug 22-26

Trap capture numbers remain low as do the PVY Risk Index values. As the season winds down and night time temperatures decrease, we expect this to trend through. Several sites did not report this week and if trap contents come in early next week, we will add them to the report.

Aphid Alert week of Aug 22-26 - Read More…

Blightline August 26, 2016

Blightline August 26, 2016

The late blight that was been confirmed in a potato sample collected in Pembina County, ND earlier this week is US23 genotype. Surprisingly, no additional fields or locations with late blight have been reported in our area. Conditions remain favorable for late blight because of the cool temperatures and spotty showers. Growers should continue to scout frequently for late blight and apply protectant fungicides on a seven-day schedule, including fields that have been abandoned due to water damage. Scouting is especially important in fields along the Canadian border, in Pembina and Walsh counties and in wet fields in northeastern ND and northwestern MN that may be exposed to late blight spore showers. This late blight has the potential to spread to unprotected and abandoned fields near the infected field.

Blightline August 26, 2016 - Read More…

Speical edition of the NDSU Potato Blightline

Speical edition of the NDSU Potato Blightline

Late blight has been confirmed in a potato sample collected in Pembina County, ND. We do not yet know the genotype of the isolate. Late blight severity values in our area continue to increase and conditions remain favorable for late blight because of the wet conditions and spotty showers. Growers should continue to scout frequently for late blight and apply protectant fungicides on a seven-day schedule, including fields that have been abandoned due to water damage. Scouting is especially important in fields along the Canadian border and in wet fields in northeastern ND and northwestern MN that may be exposed to late blight spore showers. This late blight has the potential to spread to unprotected and abandoned fields near the infected field.

Speical edition of the NDSU Potato Blightline - Read More…

Blightline Aug 22, 2016

Blightline Aug 22, 2016

Late blight has not been reported in ND or MN. Late blight severity values in our area continue to increase and conditions remain favorable for late blight because of the wet conditions and spotty showers. All sites except Mandan and Williston have exceeded the threshold value of 15.

Blightline Aug 22, 2016 - Read More…

NPPGA Field Day 2016

NPPGA Field Day 2016

North Dakota State University and the University of Minnesota potato research will be highlighted during the Northern Plains Potato Grower Association Field Day on Thursday, Aug. 25. 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. 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 5:30 p.m. The final stop will include research poster presentations and an evening meal.

NPPGA Field Day 2016 - Read More…

Blightline August 15

Blightline August 15

Late blight has still not been reported in ND or MN despite very favorable conditions. Late blight severity values in our area continue to increase and conditions remain favorable for late blight because of the wet conditions and spotty showers. All sites except Linton, Mandan and Williston have exceeded the threshold value of 15. Severity values are high in all other locations and conditions have been favorable in southeastern ND and southwestern MN the past two days.

Blightline August 15 - Read More…

Management of Potato Psyllids

Management of Potato Psyllids

Adult potato psyllids have been detected in some fields in western and south central North Dakota potatoes. This insect is mainly found in the Rocky Mountain states. Potato psyllids are believed to overwinter in the southern most U.S. states and Mexico and re-establish to northern locations in the summer via wind dispersal. They are not known to overwinter in North Dakota. Potato psyllids are of principal concern because they can transmit the Liberibacter bacterium which causes Zebra chip.

Management of Potato Psyllids - Read More…

Blightline August 5, 2016

Blightline August 5, 2016

Late blight has not been reported in ND or MN. We are looking forward to good drying weather after the rounds of excessive rain and damage to fields. Late blight severity values in our area continue to increase and conditions remain favorable for late blight because of the wet conditions.

Blightline August 5, 2016 - Read More…

CPB Management

CPB Management

There may be a couple of reasons for this, the cool wet early summer probably slowed down beetles and decreased at-plant insecticide efficacy, we have been recording increased tolerance to neonicotinoid insecticides, and the delayed emergence of CPB recorded over the last few years in central MN may now be happening in both locations....For whatever reason, the issue is now management of mixed stages of larvae and adults or simply late season adults, depending on your location. Either way, we're fighting a foliar battle now.

CPB Management - Read More…

Blightline July 25, 2016

Blightline July 25, 2016

Late blight has not been reported in ND or MN. Finally, we are looking forward to good drying weather after the rounds of thunderstorms last week that added more rain to already too wet fields. The excessive rain dramatically increased late blight severity values in northern and eastern ND and northwestern MN, and many sites have exceeded the threshold value of 15. This is especially true in non-irrigated fields. Late blight can move long distance with thunderstorms, and it is possible that late blight can leapfrog from western MB to northern ND where abundant water and conditions favorable for late blight are present. Growers should scout frequently for late blight and apply a protectant fungicide to fields, including fields that may be abandoned due to water damage.

Blightline July 25, 2016 - Read More…

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