Uncinula necator (Schow) Burr.: Efficacy of several fungicides under production conditions and on scions

Abstract

The efficacy of several fungicides based on sulphur, propiconazole, kresoxim-methyl and pyrazophos was examined under production conditions and on scions in Podgorica environs over three successive years (2002, 2003 and 2004). The experiments were conducted based on EPPO methodology (1997) and data statistically processed. Infestation with grape powdery mildew was found to be more intensive under production conditions than on scions in each year of investigation. The heaviest infestation was on the bunches and than on shoots and leaves. The most evident difference in fungicide efficacy was also found on the bunches. Kresoxim-methyl demonstrated the highest average efficacy. Propiconazole was highly effective, while the efficacy of pyrazophos and sulphur was lower, and the intensity of disease, compared to control, was very significantly lower in statistical terms.

U proizvodnim uslovima i na kalemovima, na području Podgorice, tokom tri eksperimentalne godine (2002, 2003. i 2004) ispitivana je efikasnost preparata na bazi sumpora, penkonazola, kresoksim-metila i pirazofosa. Eksperimenti su izvedeni po metodama EPPO (1997), a rezultati su odgovarajuće statistički obrađeni. Utvrđeno je da se pepelnica vinove loze svake godine intenzivnije javljala u proizvodnim uslovima nego na kalemovima. Takođe, najjači napad pepelnice bio je na grozdovima, slede lastari, pa listovi. Na grozdovima je i najizraženija razlika u efikasnosti ispitivanih fungicida. Najveću prosečnu efikasnost ispoljio je kresoksim-metil. Vrlo efikasan do efikasan je bio penkonazol, a manje efikasni su bili pirazofos i sumpor, ali je i kod njih intenzitet oboljenja u poređenju sa kontrolom, takođe, bio vrlo značajno manji.