June
1997
, Volume
81
, Number
6
Pages
592
-
596
Authors
T. L.
Zuniga
,
Graduate Research Assistant
, and
T. A.
Zitter
,
Professor, Department of Plant Pathology, Cornell University, Ithaca, NY 14853
;
T. R.
Gordon
,
Associate Professor
,
D. T.
Schroeder
,
Graduate Research Assistant
, and
D.
Okamoto
,
Staff Research Associate, Department of Environmental Science Policy and Management, University of California, Berkeley 94720
Affiliations
Go to article:
RelatedArticle
Accepted for publication 14 February 1997.
Abstract
ABSTRACT
Forty-six isolates of Fusarium oxysporum f. sp. melonis obtained from soil samples throughout melon-producing areas in New York State were identified on the basis of pathogenicity and colony morphology. Physiological races 1 and 2 were identified by their reaction on a set of differential melon cultivars. Race 1 was widely distributed, occurring in six of the seven New York counties surveyed. Twenty-seven of the 28 race 1 isolates were associated with vegetative compatibility group (VCG) 0134, whereas one was incompatible with all known VCGs of F. oxysporum f. sp. melonis. Twelve out of 18 race 2 isolates were associated with VCG 0131, and occurred in four counties in eastern and western New York. Five isolates of race 2, associated with VCG 0130, were recovered from a farm in Washington County, as was a single race 2 isolate which was incompatible with all known VCGs of F. oxysporum f. sp. melonis. Restriction fragment length polymorphisms in the nuclear DNA revealed variability among the isolates examined, but race 1/VCG 0134 isolates from New York and Maryland were identical or nearly so, as were race 2/VCG 0131 isolates from the two states. These findings suggest a close relationship between the populations of F. oxysporum f. sp. melonis in New York and Maryland. Race 2 isolates were more virulent than race 1 isolates, based on the number of days to first symptoms and death of melon seedlings.
JnArticleKeywords
Additional keywords:
cantaloupe,
Cucumis melo,
muskmelon
Page Content
ArticleCopyright
© 1997 The American Phytopathological Society