AgronomyDiseasesPicking away at the problem of common scab on potatoes

Picking away at the problem of common scab on potatoes

-

Dr. Claudia Goyer, a molecular bacteriologist at Agriculture and Agri-Food Canada’s Fredericton Research and Development Centre in New Brunswick, says she is seeing promising results that may help potato growers get more of their products into the global marketplace.

Common scab is a potato disease caused by bacteria in the soil and while it is not a health issue for humans, common scab’s crusty lesions on potato skin can make potatoes unmarketable.  The allowable limit for the appearance of potato scab on a potato is five per cent.

Common scab’s crusty lesions on potato skins make potatoes unmarketable.

Building on research done in Australia, Goyer has been working with Canadian tissue culture expert Dr. Vicki Gustafson to develop natural variations of Shepody and Red Pontiac varieties with greater scab resistance.

In the lab, the researchers bathed potato tissue samples in a plant toxin secreted by the microorganism that causes common scab.  As expected, the toxin killed many of the tissue samples.

Among the survivors, they looked for samples that evolved with a resistance to the toxin, and hopefully to the microorganism that produces it.

“We’re tapping into a plant’s natural ability to spontaneously change or mutate in response to stress,” says Goyer.

From the surviving tissue samples, 50 were selected for field testing and ten of those have shown improved resistance.

The Red Pontiac offshoots have been particularly promising, with 50 per cent less incidence of common scab than in current Red Pontiac variety. Researchers have been seeing up to 30 per cent less common scab in the Shepody offshoots.

Goyer is encouraged by the results, but says the evaluations will need to continue for another two to three years before the new, more resistant offshoots of the Shepody and Red Pontiac can be brought to the market.

Trending This Week

Pink, puffy lesions

Keeping an Eye on Pink Eye

0
How to save your potato crop from pink eye in the field. Pink eye is a sporadic disorder of potato tubers that may result in...
CMCDC cover crop plot

Latest Manitoba Potato Research Showcased at Field Day

0
The Canada-Manitoba Crop Diversification Field Day (CMCDC) in Carberry, Man. on Aug. 9 showcased the latest research the CMCDC and MHPEC Inc. teams are up...
Bar 9 Farms cover crop

Stopping Disappearing Soil on Bar 9 Farms in Alberta

0
Reducing soil erosion is the goal for Neil and James Bareman on their potato farm, Bar 9 Farms, in southern Alberta. Farming in southern Alberta...
Potato plants growing in a field

P.E.I. Potato Crop Looking for Rain

0
While the potato crop on Prince Edward Island is looking good it will need a timely rain to put it over the top, the...
Colorado Potato Beetle

Colorado Potato Beetles Break Down, Regrow Muscle to Survive Winter

0
New research from Western University has discovered hibernating Colorado potato beetles (CPBs) break down muscles to survive winters and then regrow them on demand...