AgronomyOntario Potato Crop Update

Ontario Potato Crop Update

-

As heat and drought continue across the province, irrigation has been the order of the day.  Many fields are in the tuber setting stage, a stage that requires adequate soil moisture for an optimum tuber set.  Fields with closed rows and vigorous canopies keep the soil cool, which reduces stress.  Potatoes suffer when soils get hot in direct sun.  Many fields still have open canopies, the result of late planting.  Unfortunately, a nice, steady rain is not in the forecast for this coming week.

Crop problems that were detected this week include:

● Long stolons with shoots at the tips instead of tubers. Varieties with low tolerance to heat, like the old processing variety Snowden, react this way when day temperatures are above 30 C and at night temperatures are above 22 C.

● Fusarium wilt:  Fusarium is a soil-borne fungus that enters potato plants through the roots and restricts water flow to the plant. The disease can be confused with Verticillium wilt, but Fusarium wilt usually spreads through the stem while Verticillium wilt is restricted to the vascular system and does not cause much rotting of the stemFusarium wilt is difficult to manage because it can persist in the soil for many years.  It also causes stem-end browning and internal browning of tubers, which reduces market quality.

   Fusarium wilt of potato plants in Ontario. Photo: Eugenia Banks

● Low incidence of leaf burning caused by high temperature combined with high humidity.

● Fiddlehead stems:  This distortion is due to herbicide drift, 2,4-D or other auxin herbicides.  Such injury may result in tuber malformations.

Good control of early blight is noticeable. As expected, late blight spores were not detected this week.

 

 

 

 

 

Fusarium Wilt Photo: Eugenia Banks
2,4-D injury. Photo: Eugenia Banks

Trending This Week

Centre pivot in P.E.I.

P.E.I. Potato Board Calls on Feds to Listen to International Experts Report

0
The Prince Edward Island Potato Board is calling on the federal government to listen to the findings from an international panel of experts who...
Soil Moisture Tensiometer

Tips to Reduce Heat Stress on Potatoes

0
How to save your potato crop when hot temperatures happen. As a consequence of climate change, Ontario has been experiencing summer temperatures that exceed what’s...
Potatoes New Brunswick logo

Potatoes New Brunswick Announces 2022 Conference Program

0
The New Brunswick Potato Conference and Trade Show will feature sessions on precision agriculture, diseases and economics, a Jan. 20 website post said. The...
Ben Lemieux

Pulsemaster Expands Presence with First North American Hire

0
Dutch-German company Pulsemaster has expanded into North America hiring Ben Lemieux as their key account manager for the Americas, a Jan. 10 press release...
Fertilizer spreading

Manitoba Launches New Fertilizer Efficiency Calculator

0
Manitoba has launched a new fertilizer efficiency calculator tool based on field-specific soil test results and science-based analysis to provide application recommendations, a Jan....