Tree-row-volume a new way for the registration of plant-protective agents in orchards? results of 3-year field trials in austrian apple orchards

摘要

During three years of field trials the Tree-Row-Volume formula was adapted to the conditions of different Austrian fruit growing regions. A working group was engaged in questions of sprayer adjustment, deposit land drift measurements. The incidence of diseases (and in 1997 also pests) was assessed. In 4 field trials in Styria and in Lower Austria the average leaf scab was at 46% (fruit scab 47%) in the untreated plots. In each trial the infestation of the treated plots was very low and there were no significant differences between the Tree-Row-Volume plots and the standard plots. The reduction of fungicides in the Tree-Row-Volume treated plots was up to 30%.