AbstractA fiefd study was conducted at the Coroza! Agricultural Experiment Substation to evaluate the effect of rotation of Dioscorea rotundata cv Habanero with D. alata cvs Kinabayo, Florido and Gunung on the incidence of Pratylenchus coffeae and dry-rot disease. For the first cycle, experimental plots were planted with cvs Kinabayo, Florido and Gunung and with cv Habanero, with and without nematicide (33.62 kg aldicarb 10G/ha at planting). For the second cycle, alf plots were planted with cv Habanero. The results of the first cycle showed a higher population of P. coffeae in piots planted with cv Habanero than in plots with the D. alata cuitivars. In this cycle, the quality of cv Habanero yams was significantly reduced by dry-rot when compared to the quality of cvs Kinabayo, Florido or Gunung. In the second cycle, the quality and yield of the cv Habanero yam tubers improved significantly in plots rotated with D. alata cultivars, as compared to quality and yield in plots under continuous planting of cv Habanero, with or without nematicide.
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