Effects of Inoculum Density and Position in Inoculation with Fusarium oxysporumi f. sp. lagenariae on the Sudden Wilt of Watermelon Grafted to Bottle Gourd

Abstract

Watermelon grafted to bottle gourd stock showed sudden wilt symptom by the artificial inoculation of Fusarium oxysporum f. sp. lagenariae at the extremely low level of inoculum density, at which not only the bottle gourd seedlings but also the stems or roots of rootstock exhibited no marked symptom. The sudden wilt of the grafted watermelon was also brought about by the artificial inoculation of only a narrow part of root system of the grafted plants.