It has always been accepted that control of nematodes is an integral part of any Granville wilt ( Pseudomonas solanacearum ) control programme, and that nematode invasion will aggravate Granville wilt infection. This trial was set up to establish whether, as a result of the above, soil fumigation treatments have any effect on the level of Granville wilt. The experiment was laid out as a split-plot design, with cultivars as main plots and fumigation treatments as sub-plots. Four cultivars were used, which have different levels of resistance to the rootknot nematode ( Meloidogyne javanica ) and to Granville wilt. The cultivars were: 1) Hicks, susceptible to both nematodes and Granville wilt; 2) Coker 371 Gold, susceptible to nematodes but highly resistant to Granville wilt; 3) RL, resistant to nematode but susceptible to Granville wilt; 4) RK 3 resistant to nematodes and moderately resistant to Granville wilt. Three fumigation treatments were used; no fumigation, the standard rate of fumigation and double rate of fumigation. Granville wilt symptoms were assessed throughout the season and there were highly significant differences between cultivars, irrespective of fumigation level. There were no differences between fumigation rates; either main effects or within the same cultivar. Nematode galling was rated at the end of the season. The trial plot was on second year land, where the nematode infestation was high. There were differences in galling between cultivars; and differences between fumigation rates only in the nematode susceptible cultivars. While fumigation had a marked effect on nematode infection, it appeared to have no effect on Granville wilt infection; whether the cultivar was resistant or susceptible to nematodes.