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Ann. Tabac, 1983-84, Sect. 2-18, p. 151-9., ISSN.0399-0354

Effect of triazoles on black-root rot (Chalara elegans) in tobacco : behavior of parasite and host

PULULU M.N.; DELON R.
Substances belonging to a new family of endotherapeutic fungicides were experimented to control black-root rot in tobacco. Four active ingredient were studied : triadimefon, triadimenol, propiconazole and ectaconazole. All these fungicides were active against the black-root rot agent but triadimenol appeared to have the greatest effect by strongly decreasing the infestation when administered as a preventive. The substances studied had an effect on the chlorophyll pigmentation of the tobaccos making them greener and they stimulated rhizogenesis. In vitro, triadimenol had little effect on the germination of the endoconidia and the chlamydospores of C. elegans; it did however slow down the growth of the hyphae. Differences in susceptibility of various isolates of the parasite were also observed.