Susceptibility of chrysanthemum and Paris daisy varieties to several isolates of Fusarium oxysporum f. sp. chrysanthemi.
Fusarium oxysporum f.sp. chrysonthemi is a pathogen recently reported in Italy on four economically important ornamental crops belonging to the Compositae family: chrysanthemum (Chrysanthemum morifolium), Paris daisy (Argyranthemum frutescens), African daisy (Osteospermum sp.) and gerbera (Gerbera jamesonii). The risk of transmission of the pathogen among these species is high because the hosts are frequently cultivated in the same nursery. The susceptibility of 24 Paris daisy and 12 chrysanthemum cultivars to 10 isolates of F. oxysporum f. sp. chrysanthemi and 3 isolates of F. oxysporum of different origin and to one isolate of F. tracheiphilum from gerbera was tested. Among the tested chrysanthemum cultivars, "Menthise bianco", "Cottonball", "Super Yellow" and "Meribel" were resistant to all the tested strains, while Pingpong gel was resistant to 10 out of 12 isolates. Among the 24 tested cultivars of Paris daisy, only "Sole mio", "Butterfly" and "Maria" were resistant to all isolates of F. oxysporum f.sp. chrysanthemi and to F. tracheiphilum. The results obtained in this work suggest the need of devoting more attention to resistance to Fusarium wilt while developing new varieties of both chrysanthemum and Paris daisy, since only few varieties are resistant to all strains tested.
Garibaldi
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A
Centre of Competence for the Innovation in the Agro-environmental Sector (AGROINNOVA), University of Turin, Via Leonardo da Vinci 44, IT-10095 Grugliasco, TO, Italy.
Bertetti
D
D
Gullino
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ML
D031843:Adonis / Q000382:microbiology*; D031202:Chrysanthemum / Q000382:microbiology*; D011723:Chrysanthemum cinerariifolium / Q000382:microbiology*; D005670:Fusarium / Q000145:classification / Q000302:isolation & purification / Q000472:pathogenicity*; D020022:Genetic Predisposition to Disease; D010935:Plant Diseases / Q000235:genetics / Q000382:microbiology* / Q000706:statistics & numerical data