Phytopathology (1996) 86, p. S5 (Dobinson et al.)

K.F. Dobinson and S. Grant (1996)
Genetic diversity of Verticillium dahliae isolates from southwestern Ontario tomato and potato fields
Phytopathology 86 (11 suppl.), S5-S5
Abstract: Verticillium dahliae isolates were collected from soil, field-grown tomato and potato plants, and trap plants. Pathogenicity of the isolates was determined by root dip inoculation of tomato cultivars Bonny Best (race 1- and race 2-susceptible) and H1350 (race 1-resistant), eggplant (cv. Black Beauty) and potato (cv. Kennebec). On the basis of restriction fragment polymorphisms at the rDNA locus, and randomly amplified polymorphic DNA (RAPD) analysis, the isolates could be classified into three DNA groups, designated I, II, and III. These groups did not correspond to host range or geographic origin of the isolates. Both groups I and II included race 2 strains, suggesting that the V. dahliae race 2 population in southwestern Ontario is not genetically homogeneous. The implications of these data with respect to disease potential and the capacity of V. dahliae to adapt to new hosts/cultivars will be discussed.

Research topic(s) for pests/diseases/weeds:
identification/taxonomy
general biology - morphology - evolution

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Verticillium dahliae	Potato (Solanum tuberosum)	Canada (east)
	Verticillium dahliae	Tomato (Solanum lycopersicum)	Canada (east)