Susceptibility of Summer Squash to the Watermelon Wilt Pathogen (Fusarium oxysporumf. sp.niveum)

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Abstract
Cultivars (34) encompassing 6 spp. of Cucurbita [C. pepo var. melopepo, C. maxima, C. ficifolia, C. moschata, C. mixta, C. pepo var. pepo] were tested for susceptibility to F. o. f. sp. niveum. All were resistant except 10 cultivars or hybrid accessions of C. pepo var. melopepo that include zucchini and yellow summer squashes. Percentage wilt in the susceptible cultivars ranged 37-100%. ''Golden Eagle'', ''Hyrific'', ''Straightneck'' and ''Early Prolific Straightneck'' were the most susceptible. ''Yellow Crookneck'' was resistant to F. o. f. sp. niveum as were ''White Bush scallop'', cushaw and pumpkin. Resistance of certain cultivars to F. o. f. sp. niveum was attributed to a reduced level of colonization in the vascular tissue rather than lack of penetration by the fungus.