Connect With Us

Browsing Category Diseases

Disease Alert

Attending winter trade shows and meetings are a favoured ritual for many potato growers. Certain topics tend to dominate the conference circuit every year, and one that’s likely to have a lot of farmers talking this winter is a brand-new strain of late blight called US-25. “This is a topic that will be discussed at winter meetings,” says Eugenia Banks, a potato specialist with the Ontario Potato Board. “There’s not much awareness…

Identifying Common Scab Species and Strains in Ontario

After conducting common scab research for many years, Eugenia Banks, a potato specialist with the Ontario Potato Board, thought a provincial survey of potato fields would help to understand what species and strains of the common scab bacterium are prevalent in Ontario. A research project was submitted by the potato board to the Canadian Agricultural Partnership (CAP) program, says Banks.  The project to collect 50 soil samples from across the province was…

Periderm Disorder Syndrome: A New Name for Potato Pink Eye

Pink eye is a sporadic disorder of potato tubers that may result in a significant loss of quality after harvest. The typical symptoms are pink, slightly raised areas that are easy to see on moist, freshly dug tubers, but difficult to notice on dry, unwashed potatoes. The affected areas usually occur around the eyes and at the tuber stem end. Pink eye will dry out under cool temperatures and low humidity in…

Common Scab Complexities

You need to know your enemy if you want to fight it, says Martin Filion, an associate professor at the Université de Moncton. “Genetic diversity of a pathogen means differences in functions the pathogen might have,” he says. “For instance, different species or strains might have different responses to chemicals or agricultural practices you are using to manage the disease.” Information about which common scab species and strains are present and their…

Pythium Leak, A Serious Yield Robber

Pythium leak has been showing up before harvest in a number of Ontario fields this year. Symptoms of Pythium leak at the early infection stage are moist gray or brown lesions around wounds, or near the stem end of tubers. Cut through the lesions and look for a creamy rot, which will darken from light brown to dark brown, to grey and finally black when exposed to air.  The cut surface has…

New Late Blight Strain Identified: US-25

A new late blight strain type, US-25, has been identified in New York State. To date, this new strain has only been found on tomato. Christine Smart, a professor at Cornell University, has been keeping potato pathologists informed on US-25, which is now known to be Ridomil/mefenoxam-resistant, says Eugenia Banks, a potato specialist with the Ontario Potato Board. US-25 is of the A2 mating type, and under laboratory conditions will infect potato…

Verticillium and Weeds

Verticillium wilt is a major soil-borne disease that can result in yield losses as high as 50 per cent in potatoes. The roots of a potato plant, or other host plant, release compounds that stimulate the germination of Verticillium dahliae microsclerotia, the fungus’s survival structures in the soil. The fungus then grows, penetrates the plant’s roots and spreads up the plant, eventually causing wilting, yellowing and early dying in potatoes. “As Verticillium dahliae completes…

New Spud Smart Webinar: Managing Potato Virus Y

Managing Potato Virus Y Live on: Wednesday, September 5, 1 p.m. EDT Register here: https://spudsmart.com/webinar/ Join our webinar and find out how to manage potato virus Y. During this webinar, participants will learn: How to plan today to manage PVY Management tools PVY What challenges growers are facing with respect to PVY and why New tactics researchers are developing to fight PVY New control product available Speakers:  Mathuresh Singh, director of Agricultural Certification Services…

Late Blight Detected Near Alliston, Ont.

On August 18, results of spore trap filter analysis were positive for late blight for the Alliston, Ont., area, says Eugenia Banks, a potato specialist with the Ontario Potato Board. Late blight was found in a field near Alliston on August 14, she says. “There was a delay of at least 10 days between plant infection and catching spores in the spore traps,” says Banks. “One of the reasons for this delay…

Potato Late Blight Confirmed in Wisconsin and Illinois, August 9, 2018

The US-23 genotype of Phytophthora infestans (the causal agent of late blight) was detected on commercial potatoes in Adams and Marquette Counties in Wisconsin and in Illinois, confirmed by University of Wisconsin – Madison researchers Dr. Yu Chen and Mr. Shane Hansen. Dr. Amanda Gevens (UW-Madison) reports that detected lesions were classic with brown, water-soaked discoloration on stems and leaves (Figure 1) with sporulation on leaf undersides (Figure 2). The US-23 genotype…

Older Articles »

You have successfully signed up for our newsletter!

Open