Late blight confirmed in Ontario

Late blight has been confirmed in a potato field near Alliston, Ontario, just days after the US23 strain was identified in Michigan state. To some extent, the finding was a surprise since spore traps in the Alliston area did not catch spores.

 

“A couple of days ago, on August 14, I collected a sample from a potato field near Alliston that looked suspiciously like late blight, but there was negligible white, fuzzy growth on the underside of the leaves and almost no stem lesions,” says Eugenia Banks, consultant to the Ontario Potato Board.  “I thought that this might be the ‘new’ blight Phytophthora nicotianae that does not sporulate very much, but the lab results are back and it is late blight.”

 

Banks speculates that the spate of hot weather probably restricted sporulation. And that’s why the spore traps did not detect the disease. A sample has been sent to Dr. Larry Kawchuk, Agriculture and Agri-Food Canada, Lethbridge, Alberta to identify the late blight strain. 

 

Until results are known, growers should note that the US 23 strain of potato blight is still susceptible to the fungicide Ridomil.  This crop protection product plus Kocide is a good tank mix for fields that will not be topkilled soon.

If latest news: 
Check if it is latest news (for "Latest News" page)
Publish date: 
Friday, August 17, 2018

Click to leave a comment

CAPTCHA
For security purposes, please confirm you are not a robot!

RELATED NEWS

UPL Ltd. acquires Arysta LifeScience

UPL has purchased Arysta LifeScience from its parent company Platform Specialty Products, and launched its new purpose called OpenAg, in support of the company’ s long-term vision.

Controlling corn earworm in sweet corn

Helicovex has been added to the growing list of biological controls from Sylvar Technologies Inc. This new mode of action is important in controlling corn earworm in sweet corn.

BASF launches insecticide Sefina

BASF’s newly released Sefina is now available to Canadian potato farmers for aphid control.

Gowan focus on biologicals

Gowan is creating a new business unit to develop bio-solutions, built around EcoFlora Agro SAS.

Orondis Gold Potato fungicide launched

Potato growers have another tool against pink rot and Pythium leak with Syngenta Canada’s new Orondis Gold Potato fungicide.