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Cucurbit Genetics Cooperative Report 16:39 (article 13) 1993

Club Mildew: Working Group on Resistance of Melon to Powdery Mildew

James D. McCreight, Michel Pitrat

U.S. Department of Agriculture, Agricultural Research Service, U.S. Agricultural Research Station, 1636 East Alisal Street, Salinas, CA 93905, USA; Station d'Amelioration des Plantes Maraicheres, I.N.R.A., BP 94, 84143 Montfavet Cedex, FRANCE

Determinations of races of powdery mildew and resistance genes in melon are confusing. For instance, plants resistance to "race 2" and susceptible to "race 1" have been observed in the F2 families crfom crosses of PI 12411F or PI 124112 with a susceptible line inoculated with Israeli isolates. This characterization was not observed using a French "race 2" isolate on the same families or on a collection of more than 400 accessions. Apparently these two "race 2" isolates do not have the same virulence genes.

At the 5th EUCARPIA Symposium on Cucurbitaceae in Skiernierwice and Warsaw, Poland, in July 1992, a group of melon breeders and pathologists (Table 1) formed a working group to clarify the relationships between the genes for resistance and the powdery mildew races. This cooperative research includes three objectives: First, obtain melon lines posessing only one gene for powdery mildew resistance. Second, test these lines with different isolates of powdery mildew at different locations around the world. Third, conduct allelism tests among the powdery mildew resistance genes.

Table 1. Club Mildew members, affiliation, and country.

J.M. Alvarez


Zaragosa (Spain

D. Gabillard

Royal Sluis France

Nimes (France)

M. Pitrat

INRA Montfavet


F. Bertrand


Nimes (France)

M.L. Gomez-Guillamon


Malaga (Spain)

C. Robledo


Nimes (France)

J.L. Bourguet

Graines Gutier

Eyuragues (France)

J.D. McCreight


Salinas, Calif. (USA)

C.E. Thomas


Charleston, S.C. (USA)

E. Floris

Univ. Politecnica

Huesca (Spain)

P. Mas


MOntfavet (France)

J.A. Tores


Malaga (Spain)

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Page citation: Wehner, T.C., Cucurbit Genetics Cooperative;
Created by T.C. Wehner and T. Ng, 1 June 2005; design by C.T. Glenn;
send questions to T.C. Wehner; last revised on 15 December, 2009