Field trials were established during the 1985-86 cropping season at Mkushi in the Central Province and at Magoye in the Southern Province in the Republic of Zambia. Sunflower (Helianthus annus) cv. CCA 81 and maize (Zea mays) cv. MM 603 were planted in soil either fumigated with ethylene dibromide or not fumigated. Plant-parasitic nematodes present were Helicotylenchus pseudorobustus, Paratrichodorus christiei, Pratylenchus zeae, and Scutellonema brachyurum at Mkushi and Meloidogyne javanica, S. brachyurum, and Tylenchorhynchus sp. (undescribed) at Magoye. Populations of P christiei increased on both crops, with greater increases occurring in fumigated plots. Scutellonema brachyurum numbers were greater on both crops in nontreated plots and increased during the growing season at both locations. Populations of Tylenchorhynchus sp. declined on sunflower in both fumigated and nonfumigated plots but increased on maize, with greater increases occurring in fumigated plots. Sunflower appear
