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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: http://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…

Innovative Approach to Breeding Could Mean Higher Yields and Better Crops

Agricultural Research Service (ARS) scientists in Albany, California, have found a way to streamline the process that scientists use to insert multiple genes into a crop plant, developing a reliable method that will make it easier to breed a variety of crops with vastly improved traits. The technology is expected to speed up the process for developing new varieties of potatoes, rice, citrus and other crops that are better equipped to tolerate…

Disease Watch: Potato Early Dying

Potato early dying (PED) is also known as early die and early maturity wilt. This disease is endemic in many fields with a long history of potato production. There is increased pressure on Canadian processing potato production to increase productivity to remain competitive in regional and global markets. PED is a major yield-limiting factor in all major potato production areas of Canada. PED results in premature vine senescence and can limit potato…

Mustering Mustard for Potato Productivity

A recent study by Agriculture and Agri-Food Canada (AAFC) scientist Dr. Bernie Zebarth, together with McCain Foods Canada agronomists and the PEI Potato Board, identified potato early dying complex (PED) and degraded soil health as the two most important factors limiting potato production in the Maritimes. So says Dr. Dahu Chen, a plant pathologist at AAFC’s Fredericton Research and Development Centre. This double threat has prompted Chen and his colleagues at AAFC…

Pocket Diagnostic Expands In U.S. Market

Pocket Diagnostic announced the addition of another distributor of their plant disease rapid tests in the U.S. Pocket Diagnostic produces in-field results in a matter of minutes, which enables advisors, inspectors and growers alike to confirm the presence of a plant pathogen quickly, meaning the necessary protocol for dealing with a plant disease can begin faster than if a sample was sent to a lab for analysis. “We are pleased to add…

New, Emerging Clones of Phytophthora Infestans in Europe

Over the last five years, EuroBlight has undertaken and coordinated an extensive survey of European populations of the late blight pathogen, P. infestans. The most recent data from the EuroBlight monitoring initiative highlighted the emergence of three new clonal lineages, named EU_36_A2, EU_37_A2 and EU_41_A2, in different parts of Europe. As ever, this raises the question of the epidemic potential of these newcomers, and of their impact on late blight management strategies. Are those…

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