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Disease Note. Occurrence of Fusarium Crown and Root Rot of Tomato in New Brunswick, Canada. R. Brammall, Horticultural Research Institute of Ontario, Box 587, Simcoe, Ontario N3Y 4N5. K. Lynch, New Brunswick Department of Agriculture, Box 6000, Fredericton, New Brunswick E3B 5H1. Plant Dis. 74:1037. Accepted for publication 17 August 1990. Copyright 1990 The American Phytopathological Society. DOI: 10.1094/PD-74-1037F. Fusarium crown and root rot of tomato (Lycopersicon esculentum
Mill.), caused by Fusarium oxysporum Schlechtend.:Fr. f. sp. radicis-lycopersici
Jarvis & Shoemaker, was detected for the first time in
New Brunswick, Canada, in March 1990 affecting about 925 m2 of
a 2,800-m2 greenhouse range. Plants of tomato cultivar Caruso were
observed with symptoms of reversible wilting, root decay, and
browning of the internal stem up to 5-7 cm above the stem base.
Affected plants had been seeded in rock wool and cultivated in a
trough nutrient film system. Isolations from diseased tissues yielded
F. oxysporum. Isolates were tested for pathogenicity toward tomato
and identified as F. o. f. sp. radicis-lycopersici using the procedures
of Brammall and McKeown (1). The cultivars WR25, Walter, and
MR13 were susceptible and CR6, previously shown to be resistant
to F. o. f. sp. radicis-lycopersici, was resistant. In Canada, Fusarium
crown and root rot has been reported from the provinces of Ontario,
Quebec, and British Columbia (2). |