ABSTRACT
The association between root-knot nematode (RKN) and Fusarium wilt of cotton has been known since the 19th century but the effect of RKN infection on the Verticillium wilt has not been widely investigated. Two pot experiments were conducted to study the levels of interaction of each fungal species with RKN. Each pot (11x11x12 cm) had three plants with bamboo sticks (1x10cm) attached to the base of the stem for the application of the fungus without disturbing the root and the nematodes. The application of the fungi took place 30 days after the nematode invasion. Scoring of vascular browning on the xylem was recorded. The results showed that the incidence of Fusarium and Verticillium was increased significantly in presence of RKN in both experiments, but the increase in Fusarium was higher than in Verticillium.

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