Induction of Resistance to Fusarium Wilt in Cucumber by Root and Foliar Pathogens

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Abstract
Resistance to cucumber wilt (caused by Fusarium oxysporum f. sp. cucumerinum) was induced in cucumber plants growing on a mineral agar medium by inoculation of the medium with F. oxysporum formae speciales nonpathogenic on cucumber and by leaf infection with Colletotrichum lagenarium or tobacco necrosis virus (TNV). Resistance was not induced against the disease in plants growing in a synthetic soil mixture in a greenhouse by any of the fungi tested when challenge followed induction by 3 days or less. Resistance was induced by foliar infection with C. lagenarium or TNV, but not F. oxysporum f. sp. melonis when the interval was increased to 7 days.