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The reproduction of three populations of Pratylenchus coffeae from Saitama, Mie, and Miyazaki Prefectures in Japan differed on 14 test crops. The Miyazaki population reproduced significantly more (P -0.05, LSD) than the Mie population on seven crops (radish, kidney bean, tomato, eggplant, chrysanthemum, and two susceptible cultivars of sweet potato), but less (P > 0.05, LSD) on seven crops (cucumber, tobacco, lima bean, cow pea, carrot, spinach, and okura). However, except in the sweet potato cultivars and eggplant, the Miyazaki population did not differ from the Saitama population in reproduction. Five populations of P. coffeae from Saitama, Mie, Nagasaki, Miyazaki, and Okinawa differed in reproductive fitness on susceptible (Koganesengan and Norin 2) and resistant (Minamiyutaka) sweet potato cultivars. Miyazaki and Okinawa populations were distinguished from Saitama, Mie, and Nagasaki populations by the significantly higher reproduction (P 0.05, LSD) on susceptible sweet potato cultivars. The latter three populations propagated poorly on all the sweet potato cultivars, suggesting that sweet potato was a poor host for these populations. The results are evidence for the presence of physiological races among the Japanese P. coffeae populations. Jpn. J. Nematol. 25 (2): 85-93 (1995: publ. 1996). Key word: reproduction, host range test, sweet potato, physiological races.

Evidence for Pratylenchus coffeae Races in Differential Reproduction on Fifteen Cultivars (Nematoda: Pratylenchidae)