CORESTA Meeting, Agronomy/Phytopathology, Cesme, 1989, P 13

Chemical control of damping-off of tobacco seedbeds

Tobacco Institute, Drama, Greece
In Greece, damping-off is mainly due to the phycomycetes P. debaryanum and P. ultimum. Other fungi, of minor importance which also cause the disease are Rhizoctonia solani, Phytophthora parasitica var. nicotianae and Thielaviopsis basicola. Ten fungicides against damping-off of tobacco seedbeds were tested in Greece in 1985, 1986, 1987 and 1988; they were as follows : Terraclor super-X (pentachloronitrobenzene 46.8% + ETCHTD 11.5%); zinc Omadine 40% WP (Zn 2-pyridinethiol 1-oxide); Tecto (thiabendazole, MSD 60%); Previcur N (propamocarb hydrochloride 72.2%); Aliette 80% WP (phosethyl-Al); Aliette 80% + Roviral (iprodione or glycophene), Previcur N + Derosal (carbendazin); Toram (methyl-thiofanate 17.5% + thiram 60%); Rizolex-T 50% WP (tolclofos-methyl 20% + thiram 30%); Validacin (validamycine A 3% L). The fungicides were applied to seedbeds through the irrigation water. Among these, Terraclor super-X and Toram provided an excellent control of the disease. Two Previcur N + Derosal applications, three Previcur N applications and zinc Omadine every week gave good protection against damping-off. On the contrary, the other fungicides gave no satisfactory protection. None of the fungicides used showed phytotoxicity.