Evaluation of gibberllins effects in association with fungicides for control grey mould in grapes merlot

¹ Ingeniera agrónoma, Laboratorio de Fitopatología, Universidade de Caxias do Sul, Calle Francisco Getúlio Vargas, 1130, CEP 95070-560, RS, Brazil
² Prof ∘. Dr ∘ en Fitopatogía, Laboratorio de Fitopatología, Universidade de Caxias do Sul, Calle Francisco Getúlio Vargas, 1130, CEP 95070-560, RS, Brazil

Abstract

This study was conducted in a commercial vineyard, testing the effect of giberilinas biofungicides associated with the objective to control Botrytis cinerea on grape cultivar Merlot grapes. The experiment was conducted with a randomized block design with 4 treatments and 4 replications. Each plot consisted of four plants. The treatments were: 1. Pro-gibb 200 mg/L pre-flowering, repeated after 10 days at a dose 200 mg/L 2. Pro-gibb in pre-flowering, repeated after 10 days, the dose of 300 mg/L; 3. Pro-gibb 200 mg/L + Serenade 4 mL/L in pre-flowering, in pre-bloom and full bloom, both pellet repeated in stadiums and early grain maturity 4. Pro-gibb 300 mg/L and Stimulate 4 mL/L in pre-flowering, in full bloom, repeated grain pellet and early maturation. The treatment Pro-Gibb 300 mg/L + Serenade 4 mL/L showed a control of 67% compared to gray mold. The treatments did not show satisfactory results for average weight of bunches and ^∘Brix. All treatments showed a higher growth of the rachis compared to control and to control Botrytis cinerea in the grape.