SUMMARY
Six hundred and fourteen fields representing 26% of the tobacco crop in the Pinar del Rio province of northwest Cuba were sampled to determine the presence and incidence of plant-parasitic nematodes. Nine genera including Meloidogyne, Rotylenchulus, Pratylenchus, Helicotylenchus, Ditylenchus, Tylenchorhynchus, Criconemoides, Trichodorus, and Aphelenchoides were identified from soil or root samples. Meloidogyne spp. and Rotylenchulus spp. were found in highest frequencies and numbers. On average, Meloidogyne spp. and Rotylenchulus spp. were found in 76% and 64%, respectively, of the fields within any of eight production zones in the province. Meloidogyne spp. were detected most frequently in the August C. Sandino production zone (99%) and least frequently in the Pilotos zone (47%). Greatest frequency of Rotylenchulus spp. was in tobacco fields in San Luis (91%) and lowest in those of Pilotos (37%). Average population density of Rotylenchulus spp. on tobacco roots in any production zo