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United States Department of Agriculture

Agricultural Research Service

Title: New concept for determination and denomination of pathotypes and races of cucurbit powdery mildew

Authors
item Lebeda, A - PALACKY UNIV.CZECH REP.
item Kristkova, E - PALACKY UNIV.CZECH REP.
item Sedlakova, B - PALACKY UNIV.CZECH REP.
item McCreight, James
item Coffey, M - UC, RIVERSIDE

Submitted to: Eucarpia Cucurbitaceae Symposium Proceedings
Publication Type: Proceedings
Publication Acceptance Date: March 1, 2008
Publication Date: May 1, 2008
Citation: Lebeda, A., Kristkova, E., Sedlakova, B., Mccreight, J.D., Coffey, M.D. 2008. New concept for determination and denomination of pathotypes and races of cucurbit powdery mildew. In: Pitrat, M., editor. Cucurbitaceae 2008. IXth EUCARPIA meeting on genetics and breeding of Cucurbitaceae, May 21-24th, 2008, INRA, Avignon (France). p. 125-133.

Technical Abstract: Cucurbit powdery mildew (CPM), which is caused most frequently by two obligate erysiphaceous ectoparasites (Golovinomyces cichoracearum, Podosphaera xanthii), occurs on field and glasshouse cucurbit crops worldwide. We review the current state of understanding of variation for pathogenicity of these two pathogens at the pathotype and race levels, and propose for use by the international CPM research, breeding, seed and production communities: 1)two sets of differential cucurbit genotypes for the identification of CPM pathotypes and races, and 2)an objective, efficient, uniform, comprehensive coded system for meaningful, concise designation of CPM pathotypes (sextet code) and races (septet code). The proposed set of pathotype differentials includes six genotypes from five species of three genera (Cucumis, Cucurbita, Citrullus) and five species. The proposed set of CPM race differentials includes 21 genotypes of a single species, Cucumis melo L. The race set can determine the race identity of either pathogen species when isolated from the cucurbit genera included in the pathotype differential set.

Last Modified: 7/25/2014