CORESTA Meeting, Agronomy/Phytopathology, Louisville, 1991

Use of fungicides against the tobacco black shank in the field

VASILAKAKIS C.
Tobacco Institute, Drama, Greece
Ten fungicides were tested against black shank, during the years 1986, 1988, 1989 and 1990, in a field classified as sandy loam and in a Basma type Oriental tobacco variety. Ridomil MZ 63.5 WP (metalaxyl 7.5% + mancozeb 56%) 1.5 and 2 kg/1000m2 had the lower infection from the disease and the highest yield. Ridomil CT 60 (metalaxyl 10% + celcrotealonil 50%) 1.5 kg/1000m2 with transplant water and Ridomil 5G (metalaxyl 5%) had rather low infection, but very good yields. Ridomil MZ 63.5 WP 250 g/HL, Previcur N (propamocarb hydrochloride 72.2%) 6 l/1000m2, Previcur N 6 1 + 6 1/1000m2, Patafol (ofurace 6% + mancozeb 64%) 2 kg/1000m2, Patafol 250 g/HL, Caltan SC (ofurace 6% + folpet + 5%) 2 l/1000m2, Caltan SC 250 cc/HI and Previcur N 200 cc + Diteane M-45 200 g/HL restricted somehow the disease and gave pretty good yields. Aliette 80% WP (phosethyl-al), Topam (methyl thiofanate 7.5 + thiram 60%) and thiram gave no satisfactory results. Also, Ridomil CT 60 1.5 kg/1000m2, in irrigation water 4 days after transplantation, gave negative results. Under the conditions of this experimentation, none of the fungicides tested was phytotoxic.