The nature of the quantitative relationships between inoculum densities of M. incognita and Fusarium oxysporum f. sp. vasinfectum on nematode infection, wilt incidence and severity, and Acala cotton plant growth has been investigated under controlled greenhouse conditions in pot tests (1). The results showed that wilt symptoms were induced only at very high Fusarium inoculum densities in the absence of nematode infection, but that low Fusarium inoculum density induced wilt symptoms in the presence of nematode infection, and furthermore, wilt symptoms and plant injury increased significantly when either or both M. incognita and Fusarium inoculum densities were increased in the presence of both organisms. M. incognita is also known to be injurious to Acala cotton plants in the absence of Fusarium wilt (2). The objectives of our research were to quantitatively define the nematode-Fusarium interaction on Acala cotton in field plots using sampling and extraction techniques that could be used routinely for planning nematode and disease management strategies.