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Development of leaf blight caused by X. axonopodis pv. allii on Welsh onion in greenhouse conditions. Five different treatments were tested for their efficacy to control leaf blight symptoms nine days after infection: (A) Oxolonic acid (Starner), (B) Φ 31, (C) Φ 16, (D) Φ 17A, (E) three-phage cocktail (Φ 16, Φ 17A and Φ 31) and (F) Control (bacteria only).
