Segundo ano de avaliação da influência do porta-enxerto da série “Geneva” na ocorrência da sarna da macieira na cultivar gala

Abstract

The cultivation of apple trees in Brazil is an example of success in the fruit industry, since in the last three decades the country has gone from being a small producer and is currently a reference in fruit production. Because the demand for the product is constant, there is a need for increased productivity in the producing areas. For this increase to be achieved, the use of pineapple rootstocks, enabling a greater density of plants in the orchards, is essential. Knowing that phytosanitary treatments, essential for the control of several diseases of the culture, represent the largest expenditure in the sector, we sought to analyze the influence of Geneva series rootstocks on the incidence and severity of apple scab in the Gala cultivar, as a way to maximize gains and facilitate management. The experiment was conducted in randomized blocks, with five different rootstocks of the Geneva series and CAT 16, with the coppiced cultivar Gala Select. Each plot consisted of 10 plants, of which eight central plants were considered useful and the others as border. The percentage of incidence and severity of apple scab on leaves was evaluated every two weeks, in addition to the same evaluations for harvested fruit. With the data obtained, the Area Under the Disease Progress Curve (AACPD) was calculated. The data was submitted to variance analysis and the means were compared using the Tukey test at 5% probability. The results revealed that the rootstocks used did not influence the increase in the disease of apple scab, in the cultivar Gala Select. [resumo fornecido pelo autor]