Dose-response relationships between stripe rust pathogen and susceptible wheat


Araujo, G.T., Amundsen, E., Aboukhaddour, R., Gaudet, D.A., Selinger, B.L., Laroche, A. 2016. Dose-response relationships between stripe rust pathogen and susceptible wheat. 37th Annual Meeting of the Plant Pathology Society of Alberta, Edmonton, AB, Nov 7-9, 2016. O, pp16.


Wheat is one of the most important cultivated crops in the world. However, wheat is affected by stripe rust, caused by Puccinia striiformis Westend. f. sp. tritici Erikss., which, nowadays, is one of the most aggressive rust diseases in wheat. It can cause severe yield losses and decrease drastically the quality of the grains. The objective of this study is to establish the minimum number of spores required to cause an infestation of stripe rust in a susceptible wheat variety under controlled greenhouse conditions and field environment by rating the disease severity. The susceptible wheat was inoculated with different concentrations (0, 103, 104, 105, 106, and 107 spores /ml) of stripe rust spores and later on, the disease severity was rated. The prevalence and severity of this disease varies with the geographic locations, host susceptibility, and weather conditions. The ‘Disease Triangle’ concept states that it is essential to have optimum weather conditions, a susceptible host crop, and a virulent pathogen in order to have disease development. If one of these components is absent or is low, disease will not occur or be less severe. Determining the minimum amount of fungal spores necessary to cause an infestation of stripe rust disease is one of the important components to predict potential epidemics. This project represents the initial step toward the development of a forecasting network which will provide the necessary information to producers about potential disease epidemics and the need for fungicides for wheat protection before the first symptoms of the disease appear.

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