Potato Extension
Blightline July 18 - Speical Edition
Late blight infected plants were found in a potato field in western Manitoba, on Saturday, July 16. The infection appears to be a hot spot and has been sprayed with a desiccant. No late blight has been reported in ND or MN.
Aphid Alert for July 11-15
More traps are reporting and while aphid vector numbers are slowly rising, although this is partly because of additional trap site reporting. The PVY Risk Index numbers are starting to creep up, check the maps below for your area's risk. We recovered Green Peach Aphids from 3 locations (Crookston, Hoople and Lake of the Woods). The rest of the vector species recovered were a bit of a mixed bag and generally low. As always though, keep scouting!
Blightline July 8, 2016
No late blight has been reported in ND, MN or MB. Late blight (US23) has been reported near Bronson in Branch County, Michigan, and in Maryland. Late blight severity values are accumulating in north central ND and northwestern MN due to the recent rains, and some sites have reached or are nearing the threshold value of 15. At this value, the accumulated weather conditions are favorable for late blight infection if inoculum is present. The protective fungicides manzozeb and chlorothalonil provide protection for both late and early blight and are best applied just before or at row closure. We recommend that growers continue to scout often for late blight.
MN Area II Potato Field Day
The MN Area II Potato Field Day will be held on July 19th at the Sand Plains Research Farm in Becker, MN at 5:30 pm. This field day will be preceeded by Agrium Wholesale field plot tour. Following the Potato tour supper will be provided.
Blightline for July 5, 2016
No late blight has been reported in ND or MN. Late blight severity values are beginning to accumulate in northern and eastern ND and northwestern MN due to the recent rains, and are nearing the threshold value of 15. The Rolla site is at 17 and a protective fungicide should be applied to potatoes in that area to protect against late blight. At this value, the accumulated weather conditions are favorable for late blight infection if inoculum is present.
Colorado Potato Beetle Foliar Insecticides
It’s shaping up to be a Colorado Potato Beetle (CPB) year in the Red River Valley. Seems even if an at-plant insecticide was applied, CPB are plentiful in some fields. There are a few possible reasons this is happening. Here is a list of insecticides and their estimated efficacy.
Potatoes in Flooded Fields
The recent excessive rainfall in potato fields can cause anaerobic conditions, making potatoes susceptible to bacterial soft rot, lenticels openings, and blackheart among other problems. This article discusses some of these issues that may occur from water-logged soils.
Blightline June 22, 2016
No late blight has been reported in ND or MN. Late blight has been reported in central Washington. Late blight severity values are beginning to accumulate in northern and eastern ND and northwestern MN due to the recent heavy rains, and are nearing the threshold value of 15. At this value, the accumulated weather conditions are favorable for late blight infection if inoculum is present.
Blightline June 10
No late blight has been reported in ND or MN. Late blight severity values are beginning to accumulate in northern and eastern ND and northwestern MN.
Blightline June 3
No late blight has been reported in ND or MN. Late blight severity values are beginning to accumulate in northern and eastern ND and northwestern MN. Late has been reported in Walla Walla County in southern Washington on June 1. It is not too early to remind the potato community to prepare for late blight. We did have late bight in central MN last year, and infected seed could from other areas could act as a source of inoculum for our region. Continuing wet weather will provide conditions favorable for late blight if inoculum is present.
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