Oct 9, 2020 - MB Potato Disease Report #21

Dr. Vikram Bisht

Potato & Horticultural Crops, Manitoba Agriculture

The week’s (Sep 28-Oct 4) highs were 10 OC cooler than last week and the lows had frost showing up in all parts of Manitoba (Table1).  http://mbpotatoes.ca/pday.cfm# and https://www.gov.mb.ca/agriculture/weather/pubs/percent-normal-p-day.pdf

The week had very low precipitation, ranging from 0.1 to 7 mm across MB potato areas (Table 1 and Fig 1). http://www.gov.mb.ca/agriculture/weather/pubs/percent-normal-precipitation.pdf.  

The 2020 crop season was hotter and with many consecutives days with 30 oC+ temperatures, which had stressed the crop in many areas (Table 2) and reduced productivity in general.

In all selected sites shown here (except Shilo) the 2020 had more 2+ consecutive hot days.  

Shilo recorded only 8 days of 30 oC+ in 2020, there were 3 time when 2 days consecutively the temperatures went 30 oC+; though in 2019 there were 11 days, but only once 2+ consecutive hot days occurred.


Harvesting is practically finished, and it is time to monitor and manage the storages. Temperature-wise, we had great harvest conditions. Unlike 2018 and 2019, all potato crop was harvested.

After-Harvest field Management:

In many fields, after potato harvest fall rye has been planted (Fig 1 - 2) to manage wind erosion now and in spring (Fig 3).

This is the last report for the 2020 crop season. 

Thanks to all cooperators.

I take this opportunity to thank industry agronomists: Scott Graham, Leon Jarvis Tavis Mangin & Landon Thomson (Simplot), Steve Saunderson (Choice Agri), Trevor Thornton (Crop Care), Carla Baer & Darren White (Delta Ag), Kurtis McGee (JP Wiebe Farms), Kurt Ginter (KR CropCheck), Kelvin Jarvis & Tyler Workman, (Jarvis Consulting), Chrissy VanDamme (UTH farms), Dan Sawatzky (KPPA), and various farms for in-season updates on crop & pest information, disease samples and support for the aphid and ECB monitoring programs.

This year’s Late Blight Spore Traps Network was supported by Simplot, Manitoba Ag, Peak of the Market and MHPEC.

Special thanks to my summer student, Phoebe Riddell and other MB Agriculture staff - Tracey Cummer, Tom Gonsalves, Manika Pradhan; AAFC staff Curtis Cavers, Leonard & Neil.

Finally a big thanks to WIN (Weather Innovation Consulting LP) for maintaining the website www.mbpotatoes.ca and support for late blight forecasting.

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