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AVRDC International Cooperators'

Fact Sheet
Cucurbit Diseases

Fusarium Wilt
Fusarium oxysporum f.sp. cucumerinum on cucumber F. oxysporum f.sp. melonis on cantaloupe; races 0,1,2,and 1-2 F. oxysporum f.sp. niveum on watermelon; races 0,1, and 2 Found worldwide, some races are localized

Damage Symptoms
Each pathogen is highly specialized attacking only a single crop species. Plants may be affected at any stage of growth. Young seedlings are killed or severely stunted. Older plants begin to wilt at midday for a few days, then permanently wilt and die. Vascular bundles are discolored becoming yellow or brown.

Yellowing and wilting of plants

Conditions for Development
The pathogens can persist in the soil for many years. The disease can move from field to field in soil on farm machinery, infected crop debris, and irrigation water. High soil temperatures favor disease development.

Vascular discoloration in the main stem

Control
Use resistant varieties when available. Avoid known infested fields for production of a susceptible crop. Wash equipment when moving from one field to another. Flooding fields for rice production reduces pathogen survival in the soil.

Last updated: 2001. Information from: Vegetable Diseases: A Practical Guide. Lowell L. Black, AVRDC.

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