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Late blight found in Ontario spore traps

Late blight was found yesterday (July 19) in the Delhi area, in a field with two spore traps.  There were only a few plants with dried up lesions. According to the grower, he had sprayed Curzate + Bravo + Copper as a preventative treatment. This week, spore traps caught late blight spores in the Shelburne, Alliston and Simcoe Delhi areas. It has been a very wet year so far, and it is…

National Potato Psyllid Monitoring Program

In 2016, the National Potato Psyllid Monitoring Program placed, picked up and examined 380 sampling cards in southern Alberta, with about 140 in the field. The program also received cards from Prince Edward Island, New Brunswick, Quebec, Ontario, Manitoba, Saskatchewan and British Columbia. As of mid-June 2017, the program was just beginning to sample for this season, with four sampling cards on stakes at each of 40 sites in Alberta, and other…

Potato Pests Outlook 2017

By all accounts, the potato industry in Canada is a healthy one, and things are certainly looking up for 2017. But to get there, potato growers know they must deal with the inevitable snags that can arise during the growing season. Namely: potato pests, such as insects and diseases. Spud Smart reached out to some experts in the field in late June to determine what risks growers may face. Prince Edward Island…

Developing wireless sensor technologies to fight potato rot in storage facilities

In Idaho, potatoes are both a humble stereotype and a half-billion dollar crop. According to the Idaho Farm Bureau Federation, every spring farmers plant more than 320,000 acres of potatoes valued at between $550-$700 million. Yet unbeknownst to most consumers, roughly 30 per cent of the potatoes harvested spoil before they reach a grocery store shelf. Boise State University researchers Harish Subbaraman, David Estrada and Yantian Hou hope to change that. In…

Dickeya dianthicola found in Western Australia

Western Australia (WA) potato growers have been hit by a fresh disease scare, with the Department of Primary Industries and Regional Development warning farmers a new, aggressive bacteria had been detected. Department irrigated agriculture executive director John Ruprecht said the bacteria Dickeya dianthicola, which causes the diseases blackleg and soft rot, had been found in a commercial crop north of Perth. While the two diseases are already in Australia, it is the…

Light potato psyllid pressure in Idaho

In Idaho, pressure from the tiny, winged insects that spread zebra chip disease in potatoes has been light this season, emboldening some Idaho farmers to scale back on their pesticide programs. Zebra chip, which is caused by the Liberibacter bacterium and spread by potato psyllids, first arrived in the Pacific Northwest in 2011. The disease creates bands in tuber flesh that darken during frying, rendering spuds unmarketable. University of Idaho (UI) extension…

Seed potatoes go to waste due to trade restrictions

The repercussions of the tomato potato psyllid outbreak are taking shape in Western Australia (WA), with seed potato growers starting to feed hundreds of tonnes of perfectly good produce to their cattle. With exports of WA potatoes and tomatoes still ground to a halt, and a fully supplied local market, seed potato producers have no home for their produce. It has forced many growers, such as Albany’s Trevor Barker, to dump their…

Potato Late Blight Management

Potato late blight is a devastating disease of potatoes. It can destroy a potato field in a few days if wet weather prevails and no effective fungicides are applied. This is a “community disease” because late blight spores are spread by wind from infected to healthy fields. Thus, the management practices followed by individual growers will affect an entire potato production area. Late blight is carried over from one season to the…

Should Seed Potato Growers start testing for Dickeya?

The potato disease Dickeya can be detected by laboratory testing — but is there enough of it present to justify the higher costs? That is the question for Canadian seed potato growers exporting to the United States who are increasingly asked for the test. It’s a relatively new threat to North American potato production. The invasive pathogen Dickeya dianthicola — not to be confused with blackleg causing Dickeya solani — was first…

Strain Tracking

Through a national initiative, Canadian researchers have found that late blight strains have shifted dramatically across the country since 2009. The researchers have also identified important differences among the strains in such characteristics as fungicide sensitivity, host preferences, and aggressiveness on potato tubers and foliage. And their findings are making a vital difference in late blight prevention and management. The research is led by Rick Peters, a research scientist with Agriculture and…

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