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Abstract Detail

Host/Plant Pathogen Interactions and Plant Health Management

Kalischuk, Melanie [1], Peters, R.D. [2], Al-Mughrabi, Khalil [3], Daayf, Fouad [4], Harding, Michael [5], Sabaratham, Siva [6], Howard, R [7], Kawchuk, Lawrence [8].

Chronic late blight caused by Phytophthora infestans US-23 limits conventional disease management strategies.

An increase in the occurrence and diversity of the late blight pathogen on potato in Canada has been documented, causing acute and chronic crop losses due to disease. Late blight, caused by Phytophthora infestans, is a historically infamous disease associated with the Irish Potato Famine that remains a devastating disease of potatoes and tomatoes. A national survey was conducted in Canada during 2013 and 2014 that yielded over 100 P. infestans isolates from the major potato growing areas. The P. infestans genotype US-23 dominated late blight pathogen populations in most provinces and was frequently observed in garden tomatoes contributing to the prevalence of the disease. Results also showed that the P. infestans US-23 genotype quickly developed insensitivity to the systemic fungicide metalaxyl-m. Importantly, the monitoring of pathogen pressure through volumetric spore traps is providing valuable information regarding the risk of late blight and location of hot spots. Disease prevention strategies will need to reduce chronic sources of inoculum produced from tomatoes through management, education, and promotion of late blight resistant varieties such as Iron Lady, Defiant, and Mountain Merit. Other isolated P. infestans genotypes included US-8, US-11, and US-24, but only from potato. In some areas, both A1 and A2 mating types of P. infestans were found in close proximity and this is of concern because it increases the potential for sexual recombination producing oospores that may survive in the absence of host tissue and the development of new strains of the pathogen with potentially devastating characteristics.

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1 - Lethbridge College, Environment, Lethbridge, AB
2 - Charlottetown Research Centre, Agriculture and Agri-Food Canada, Charlottetown, PE, Canada
3 - New Brunswick Department of Agriculture, New Brunswick, NB
4 - University of Manitoba, 222 Agriculture Building, University of Manitoba, Winnipeg, Manitoba, R3T2N2, Canada
5 - Alberta Agriculure, Brooks, AB
6 - BC Ministry of Agriculture, Abbotsford, BC
7 - RJH AgResearch Solutions, Brooks, AB, Canada
8 - Lethbridge Research Centre, Agriculture Canada, PO Box 3000, Lethbridge, AB, T1J 4B1, Canada

late blight

Presentation Type: Poster:Posters for Topics
Session: P
Location: Hall D/The Shaw Conference Centre
Date: Monday, July 27th, 2015
Time: 5:30 PM
Number: PPA029
Abstract ID:1251
Candidate for Awards:None

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