Epifluorescence Microscopy ofSphaerotheca fuligineaRace 2 on Susceptible and Resistant Genotypes ofCucumis melo

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Abstract
Fungal growth and host response were investigated in leaves of susceptible, moderately resistant, and resistant genotypes of muskmelon with the aid of the fluorescent stain calcofluor, using ultraviolet epifluorescence microscopy. Fungal germination at 24 hr with a single germ tube proceeded equally well on all genotypes, but the production of the second and third germ tubes at 48 hr, hyphal growth, and sporulation were inhibited in resistant genotypes, probably because of the hypersensitive reaction of epidermal cells that was associated with germ tubes and hyphae. The possibility is raised that the resistance to race 2 of Sphaerotheca fuliginea.