Common Hosts for Fusarium oxysporum formae speciales spinaciae and betae

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Abstract
Inoculations of spinach, beet, mangel and Swiss chard cultivars with F. oxysporum f. sp. spinaciae and f. sp. betae revealed common hosts in cultivars of sugar and garden beet. Due to common hosts, the wilt Fusarium from spinach and the one from beet are classified as race 1 and race 2, respectively, of F. oxysporum f. sp. spinaciae. Mangel and Swiss chard cultivars were resistant to race 1 but susceptible to race 2. Cultivars of spinach and Lychnis chalcedonica were susceptible only to race 1. No external symptoms of wilt were noted on spinach and sugar beet plants after inoculation with 50 other formae speciales and races of F. oxysporum. Forma specialis spinaciae race 1 was nonpathogenic on plants in 45 different species and cultivars of numerous genera, which have been useful in separating forms and races of F. oxysporum; f. sp. spinaciae race 2 was nonpathogenic on plants in 44 of these species and cultivars. All isolates of the sugarbeet Fusarium (race 2) from Colorado [USA] failed to produce macrospores in culture unless exposed to fluorescent light. This character was found in 3 collections made during a period of 26 yr.

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