Abstract
The influence of Fusarium wilt-resistant broadleaf tobacco and Globodera tabacum tabacum on infection and secondary inoculum production by Fusarium oxysporum f. sp. nicotianae was investigated under greenhouse and field microplot conditions. Wilt severity and postharvest F. osysporum density in soil was greater for wilt-susceptible than wilt-resistant tobacco in all experiments. G. t. tabacum increased the number of F. oxysporum colonies recovered per centimeter of root for wilt-susceptible but not for resistant tobacco after 8 wk. F. oxysporum levels in soil were greater after plant infection by both F. oxysporum and G. t. tabacum than after plant infection by F. oxysporum alone. Wilt-resistant tobacco supported F. oxysporum densities that were intermediate between susceptible tobacco and fallow and significantly greater than fallow only after more than one season of production, regardless of nematode infection, under both field and greenhouse conditions
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