Back V. Robotic, R. Bosancic and M. Mojic
Navip-Fruskogorac, s.c. Karlovicki put, 21131, Petrovaradin, Yugoslavia
Abstract
The possibility of controlling the vine powdery mildew caused by the fungus
Unicinula necator (Schw.). Burr. was studied by the use of EM preparations
acceptable in organic vineyard for grape protection. The experiment was
conducted during the cultivation period, in the year 2000, and Riesling
Italian vine cultivar was used. In all 7 treatments were used. The first
spraying was conduced at the vegetative shoots stage 15 (EL stage scale).
Preparations EM-1 and EM-5 were used in 5.0 % and 0.2 % concentration respectively.
Combinations of these two products were also tested. Conventional fungicide
combinations (propiconazole 0.15% + sulphur 0.2% + mankozeb 0.2%) and plant
extract prepartion Urticum in combination with Humisin (1.0% + 1.0%) were
used as the reference products. The efficiency of spraying EM-1, EM-5 and
with combination of both products were 98.91%, 97.64% and 98.28% respectively.
The efficacy of spraying by combination of fungicides was higher, while
there was no statistical significance, compared to the EM products and
plant extract preparation. The wines were produced from the grape from
experimental plots. The wine produced from the grape protected with EM-1
prepration had the best sensory characteristic, specially aroma and taste.
The results of this one year study shows that EM preparations can be used
for the control of vine powdery mildew with positive effect on grape and
wine quality.