Conference PaperPDF Available

EVALUATION OF BORIC ACID ACTIVITY AGAINST APPLE SCAB (VENTURIA INAEQUALIS) IN SEMI-FIELD AND FIELD TRIALS

Authors:
  • Plant Protection Service Emilia-Romagna Region
  • ASTRA Innovazione e Sviluppo

Abstract

Semi-field and field trials were carried out in 2017-2019 to verify the preventive and curative activity of boric acid for the control of primary and secondary infections of Venturia inaequalis on apple. The semi-field trials were carried out on potted apple plants cv Fuji exposed in the field to receive the natural inoculum of V. inaequalis, performing a preventive or curative application on a single infection, then evaluating the efficacy of the products in greenhouse. A field trial was carried out in 2017 in an apple orchard cv Hi Early, comparing boric acid with an untreated check and a reference standard, applying the products preventatively at weekly intervals. In all the trials boric acid was statistically superior to the untreated check. The results of the semi-field trials demonstrated a good preventive and curative activity of boric acid (> 70%) on leaves, with an efficacy level similar to that provided by difenoconazole, used as reference standard. The field trial on the primary infections of apple scab showed an efficacy level close to 70% also on the fruits, statistically similar to that provided by the reference dithianon. No phytotoxicity was observed on the treated crop.
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