Evaluación de productos para el manejo de Alternaria spp. en el cultivo de brócoli (Brassica oleracea var. italica)

Abstract

In this study, products were evaluated for the management of (Alternaria spp.) in broccoli (Brassica oleracea var. italica). For this purpose, the effect of two doses of Ozbrand (2 and 4 cm3/l), an ozonated oil with fungicidal properties, was tested and compared with a chemical fungicide (Acord at doses of 0.5 and 1 cm3/l). The variables evaluated were percentage of incidence and severity of the disease, weight and diameter of the head, and crop yield. The incidence in plants treated with ozonated oil (Ozbrand) varied between 23.4 and 26.0%, which meant a reduction of 36.3 and 42.6%, compared to the control treatment, while, in severity, when it was used at the highest dose (4 cm3/l), this product showed results comparable to those obtained with the use of the chemical fungicide. Furthermore, it was observed that the use of Ozbrand at the highest dose (4 cm3/l) allowed obtaining the maximum value of pellet diameter, with values of 20.5 cm, followed by the same product applied at the lowest dose (2 cm3/l), which produced similar results to when the chemical fungicide (Acord) was used at the highest dose (1.0 cm3/l), with which 18.8 and 17.8 cm were obtained, respectively. A similar trend was observed in relation to pellet weight, which was evidenced in the highest yield in plants treated with Ozbrand at a dose of 4 cm3/l (5.3 tn/ha), followed by plants treated with the same product at the lowest dose (4.3 tn/ha). Based on the results, the use of ozonated oil is recommended to control Alternaria leaf spot. Keywords: ozonated oil, broccoli, leaf spot, sustainable management