Sep 23, 2014 - Potato Disease Report 20

By Vikram Bisht
Potato & Horticultural Crops, Manitoba Agriculture, Foods and Rural Development


Harvest is progressing well in most areas of the province. Light frost on Sept 12 did affect foliage in a few fields; the incidences were scattered and generally affected the top foliage. Tubers were not frost damaged.

Some potatoes are being directly shipped from fields to processors. For those crops which are going into storage, it is important to think about management of storage diseases, right from the field being harvested. It is important to harvest wet spots in the field last and store separately, or schedule the harvest so that tubers from wet areas are at the front of the pile and easily accessed when required. Checking of a few fields being harvested showed low levels of leak, pink rot and soft rot infections. It is best to grade out the affected and broken tubers, since these could be the source of hot spots in storages later.

Post harvested treatment with phosphorus acid products could be considered, especially for fields where tuber quality could be an issue. Other types of post-harvest treatments are also available, and may be used depending upon the expected risk(s).

The production season is almost over; and Manitoba has been lucky to not have any report of late blight, so far. Late blight has been reported from all other major potato producing provinces.

This is last of the regular reporting for the season; reporting of diseases, pests or other issues will be only when needed. Thanks to all the agronomists Scott Graham, Leon Jarvis, Darren White, Kurt Ginter, Steve Saunderson and others for your cooperation through the season. Thanks to Mike Wroblewski and Andy Nadler for the weather network.

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