Browsing by Author "Ijani, Afihini Suleiman Mrindoko"

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    Studies on some methods of control of root-knot nematodes (Meloidogyne species) on tomatoes (Lycopersicon esculentum mill.)
    (University of Dar es Salaam, 1984) Ijani, Afihini Suleiman Mrindoko
    Species of Meloidogyne constitutes a major group of pathogenic nematodes affecting vegetable production in Tanzania. Studies on their distribution and effective control methods are currently inadequate. 1n this study, meloidogyne hapla, M. incognita and M. javanica were found to infect tomatoes, okra and pumpkins respectively in Dar es Salaam area. Some methods for controlling root-knot nematodes on tomatoes were assessed in the glasshouse and field conditions. Tomatoes were grown together with various densities of Tagetes erecta and Tagetes minuta in root-knot nematode infested soil. As the density of Tagetes plants grown with one tomato plant in^,reared, the number of root galls formed per tomato plant decreased. Growing tomato plants with Tagetes plants in the ratio of 1:2 gave the highest shoot heights and dry weights of the tomato crop. When the effectiveness of Tagetes species to control root-knot nematodes was compared to nematicied, ethylene dibromide have the best control followed by aldicarb, whereas Tagetes species were not as effective. Nevertheless, the highest tomato shoots, dry weights and fruits yield were obtained when plants were treated with aldicarb, followed by Tagetes. Treatment with ethylene dibromide produced the least results. This was attributed to nitrification lag and toxicity effects of the nematicide. The study on the decrees of susceptibility of ten vegetable species to Meloidogyne hapla, M. incognita and M. javanica revealed that tomatoes were highly susceptible. Cucumber, beans and okra were susceptible while cowpeas, eggplant and pumpkins had intermediate reactions to the nematodes. Spinach, sweetpepper and swisschard were resistant to them and reduced their numbers in the soil. The susceptible vegetables increased the density of the nematodes in the soil on where they were grown. From these results recommendations were made for appropriate actions