C and 40 C were used to determine the temperature effect on the growth of H. fulvum. Maximum growth of H. fulvum was obtained at 25 C and 30 C temperatures. The fungus was also cultured on 100, 92.5, 85, 74 and 32.5% relative humidity regimes. The fungus showed maximum growth at 92.5 and 100% relative humidity. The growth of the fungus was observed to increase with increase in relative humidity and vice versa. There were significant differences (P 0.05) in the growth of the fungus at different temperature and relative humidity regimes. The implication of these findings were discussed.

A screen house experiment was conducted to test the efficacy of leaf extract of mahogany (Khaya senegalensis L) for the control of root-knot nematodes of tomato. The completely randomized design was used to test the materials. Results obtained showed that the leaf extracts of the mahogany plant significantly (P˂0.05) reduced the population of the nematodes compared to the untreated seedlings. It also indicated that there is significant difference (P˂0.05) on the effect of the extract on the test organism between the varying concentrations of the extract used. The study revealed that the higher the concentration of the extract the more its effect on the test organism. The result also showed a significant variation (P˂0.05) in the extent of galling, plant height and root lenght in tomato treated with different levels of concentrations of the leaves extracts. The implications of these findings were discussed.