Extrato do pó de canola no controle de oídio (Blumeria graminis f. sp. tritici) em trigo

Abstract

Currently, with the growing demand for food and inputs, there is also a need to supply them sustainably. Current researchers are looking for alternative ways to replace chemical control, making it possible to increase the supply of healthy products. In the current scenario, the use of natural products, such as plant extracts, in the control of phytopathogens has shown great potential, as it is a great advantage for production systems. Thus, this study sought to demonstrate an efficient practice in controlling powdery mildew of an indicator plant, wheat, through the use of canola powder extract, an easily obtainable product that reduces costs and aims to minimize possible environmental impacts. The experiment was conducted in a greenhouse at the Federal Technological University of Paraná campus Pato Branco. The canola extracts were obtained in the form of aqueous extraction, stirred in a blender, at 6 concentrations, namely: 0, 2, 4, 6, 8, and 10%. The applications were started with the seedlings in the vegetative stages Z1.3, Z2.1, being carried out every 7 days after the first application, a period of 4 weeks. The inoculation of the phytopathogen was carried out immediately after the first application of the extracts. Severity assessments were performed weekly, starting 7 days after the first application of the extracts and repeated always before the reapplication of treatments. As the concentration of the extract increases, the severity of the disease decreases. All concentrations of powdered canola extract (2, 4, 6, 8 e 10%) decrease the severity of powdery mildew in wheat. The extract in higher concentration (10%) showed greater efficiency in controlling the disease.