Phytoparasitica (1999) 27, 144-145

Leah Tsror (Lahkim), Marina Hazanovsky, Sara Leviush-Mordechai and Sara Sivan (1999)
Pathogenicity of Verticillium dahliae of different vegetative compatibility groups
Phytoparasitica 27 (2), 144-145
20th Congress of the Israeli Phytopathological Society, February 15-16, 1999, Bet Dagan, Israel, lecture
Abstract: Pathogenicity of Verticillium dahliae isolates of three vegetative compatibility groups (VCGs) was tested in potato, tomato and pepper. Significantly more severe symptoms were observed in potato plants inoculated with VCG4B as compared with plants inoculated with VCG2B or VCG2A. Colonization level in plants inoculated with VCG4B was also significantly higher, and disease symptoms developed more rapidly. Plants inoculated with VCG4B and VCG2A had lower weights than those inoculated with VCG2B. In tomato, VCG2A produced significantly more severe symptoms than did VCG4B and VCG2B. The colonization level of VCG2A isolates was also significantly higher than the level of VCG4B and VCG2B. No correlation was observed between VCGs and weight or height of tomato plants. These results indicate a correlation between VCGs and virulence to potato and tomato; VCG4B is virulent primarily to potato and VCG2A primarily to tomato. No correlation was observed between origin of isolates (host) and virulence to potato and tomato. However, potato isolates colonized potato plant tissue at significantly higher rates than did isolates from cotton, eggplant and tomato. In tomatoes, isolates from potato, eggplant and tomato colonized the tissues at significantly higher rates than did isolates from cotton. In pepper, only one isolate (of 53), originating from paprika and classified as VCG2B, was virulent and caused severe disease symptoms and plant death. All other isolates, although they colonized plant tissues at various levels, did not cause disease. Among the isolates that were not virulent to pepper, 23 originated from paprika plants grown in commercial plots where potatoes had been cultivated previously, and 16 from the soil in these plots. These isolates caused moderate to severe symptoms on potatoes. These findings indicate that the virulence of an isolate is not necessarily correlated to its original host, and may reflect the 'history' of the plot.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)

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

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Verticillium dahliae	Eggplant (Solanum melongena)
	Verticillium dahliae	Green pepper/chilli (Capsicum)
	Verticillium dahliae	Potato (Solanum tuberosum)
	Verticillium dahliae	Tomato (Solanum lycopersicum)
	Verticillium dahliae	Cotton (Gossypium)