MANIFESTATIONS OF BLACK ROT (GUIGNARDIA BlDWELLII (ELLIS) VIALA & RAVAZ) IN CONVENTIONAL AND ORGANIC CULTIVATION OF VINES IN THE CONDITIONS OF YEAR 2014

摘要

Routing investigation was carried out during the vegetation period of 2014 at IVE-Pleven for black rot spread in vineyards for conventional and organic grapes production.The agro-climatic conditions of the year were analyzed as a precondition for the development of vine fungal diseases. The results showed almost tenfold stronger attack of black rot in organic cultivation compared to conventionally grown varieties.The lowest rate of the disease spread was recorded for Muscat Kaylashki variety for both systems of cultivation, 1.9% and 18.5%, respectively. High sensitivity was found for Muscat Ottonel variety, which had almost 100% infested vines in the organic cultivation. It was accounted a relatively weak attack on berries and clusters that was probably due to the more frequent use of fungicides against downy mildew and powdery mildew, some of which were effective against black rottoo.