Effect of Nonhost Crop Plants on Watermelon Fusarium Wilt

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Abstract
Nine crop plant species [bahiagrass, digitgrass, cucumber, corn, pearl millet, soybean, bermuda grass, hairy indigo, pepper followed in the same year by eggplant] that are nonhosts of Fusarium oxysporum f. sp. niveum were grown for 3 yr in a field naturally infested with high levels of the watermelon Fusarium wilt fungus. Decline of the wilt fungus, as determined by greenhouse bioassay, was similar with all 9 nonhost crops. Watermelon yields were highest after 3 yr of bahiagrass than after any of the other nonhosts. Apparently, a reduction in Fusarium wilt was not the sole benefit of the bahiagrass sod.

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