Journal of Plant Pathology (2017) 99, 445-451

G.E. Clemente, M.E. Bazzalo and A.R. Escande (2017)
New variants of Verticillium dahliae causing sunflower leaf mottle and wilt in Argentina
Journal of Plant Pathology 99 (2), 445-451
Abstract: The sunflower leaf mottle and wilt caused by Verticillium dahlie Kleb. is a major disease of the crop. The populations of V. dahliae are variable and physiological races of the pathogen have been reported in lettuce, pepper, spinach, sunflower and tomato. The classification of V. dahliae isolates based on their pathogenicity in differential sunflower genotypes to determine races of the pathogen gives useful information for growers and breeding programmes. Two new V. dahliae races causing sunflower leaf mottle and wilt in sunflower hybrids previously known as resistant were recognized. The sunflower inbred lines ADV29 and ADV53 allowed to differentiate specific pathogenicity patterns. One isolate that affected both genotypes was postulated as race VArg3, and another group that did not cause disease on either genotype was described as race VArg4. Sunflower genotypes showing inverse differential reactions to races VArg3 and VArg4 were not found. However, the observed pathogenicity patterns could be considered a phenotypic marker useful to identify the V. dahliae races VArg3 and VArg4 in monitoring studies. The current presence of four races of V. dahliae affecting sunflower in Argentina is discussed.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Maria Eugenia Bazzalo

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	Sunflower (Helianthus annuus)	Argentina