Commercial farmers spray their potato fields with fungicide to help protect the plants against late blight. (Joe Allen/Flickr)

Commercial farmers spray their potato fields with fungicide to help protect the plants against late blight. (Joe Allen/Flickr)

Agassiz researcher asking home gardeners help battle potato blight

New strains of the potato disease are becoming resistant to some fungicides

Not all pathologists are focused on COVID-19 these days. Some are looking at potatoes.

Rishi Burlakoti is a plant pathologist at the Agassiz Research and Development Centre, and he is three years into an investigation on Canada’s potato blight.

Late blight, caused by a water-based mold called Phytophthora infestans, is the same disease that caused the infamous Irish Potato Famine in the late 1840s. In the late 20th century, there were major resurgences of the disease.

In 2018, Burlakoti partnered with other Canadian researchers to begin examining where the potato blight was being found in Canada.

Perhaps unsurprisingly, given the weather, B.C. had blight in most of the home gardens Burlakoti visited and many of the commercial fields as well. Blight develops best in wet conditions, when the temperature stays between 15 C and 25 C.

“We found if it’s very dry and if there is less rain … the disease may not come,” Burlakoti said about his research. “But in B.C., we found a lot of the disease here.”

That is a problem for commercial growers, as they need to apply fungicide more regularly to protect their plants from the disease.

“That means their cost of production will be higher,” Burlakoti said. “At the same time, if they are not able to protect, then they might entirely lose their crop. That is a real issue.”

SEE ALSO: Agassiz study to look at drone use for pesticide application

Home gardeners don’t face the same dire consequences if blight enters their private plot.

But having late blight in private gardens can keep the disease alive and flourishing, and that could mean more destructive problems in the future.

“Maybe you’ve heard about the new strains of COVID, right. It’s a similar concept,” Burlakoti explained. “Every couple of years, a new strain of the pathogen will come, and it’s becoming an issue.”

In Burlakoti’s research, he examined what kinds of variants of late blight were being found around Canada. In B.C., he said, there were “more diverse strains than in Eastern Canada.”

Significantly, between 80 and 90 per cent of Burlakoti’s research collection was resistant to metalaxyl, the most commonly applied fungicide for the disease.

If the pathogen develops resistance to the fungicide, it will make it more challenging for growers to manage the disease.

“So yes, this is a big issue,” Burlakot said.

Burlakoti’s research partners on the east coast have started to do some outreach to home gardeners about how they can combat late blight. He’s hoping to do the same in B.C. and said the best thing that gardeners can do is use plants that are resistant to late blight.

SEE ALSO: Spud growing and problems with potatoes

Tomatoes can be susceptible to late blight as well as potatoes, and gardeners can look for resistant varieties such as Mountain Mist, Defiant PHR, Mountain Merit and Iron Lady. Potatoes in general are more susceptible to the disease, but russet potatoes are more likely to be resistant.

Gardeners can also do their part to prevent water build-up around their plants by building a small shelter over their plot.

“If it prevents the rain, the chance of the disease might be reduced,” Burlakoti said.

Applying copper fungicide before late blight is noticed can also help with prevention of the disease.

Making sure to properly dispose of infected plant material is also important, as composting infected potatoes or leaves can mean keeping the disease alive long enough to infect the next batch of plants.

Any gardeners who do find late blight can share their infected plants with Burlakoti at the research centre, as he is continuing his investigation into late blight and its varieties for another two years. Gardeners can contact Burlakoti directly, or drop off their plants at the B.C. Ministry of Agriculture’s plant health lab (91767 Angus Campbell Road).



news@ahobserver.com

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