Ja. Lamondia, INFLUENCE OF RESISTANT TOBACCO AND TOBACCO CYST NEMATODES ON ROOT INFECTION AND SECONDARY INOCULUM OF FUSARIUM-OXYSPORUM F SP NICOTIANAE, Plant disease, 79(4), 1995, pp. 337-340
The influence of Fusarium wilt-resistant broadleaf tobacco and Globode
ra tabacum tabacum on infection and secondary inoculum production by F
usarium oxysporum f. sp. nicotianae was investigated under greenhouse
and field microplot conditions. Wilt severity and postharvest F. oxysp
orum density in soil was greater for wilt-susceptible than wilt-resist
ant tobacco in all experiments. G. t. tabacum increased the number of
F. oxysporum colonies recovered per centimeter of root for wilt-suscep
tible 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-resis
tant tobacco supported F. oxysporum densities that were intermediate b
etween susceptible tobacco and fallow and significantly greater than f
allow only after more than one season of production, regardless of nem
atode infection, under both field and greenhouse conditions.