SISTEMA DE ALERTA FITOSSANITÁRIO DE SEPTORIOSE EM TOMATEIROS PARA PROCESSAMENTO INDUSTRIAL

Abstract

The septoria leaf spot, caused by the fungus Septoria lycopersici Speg., is one of the main diseases of tomato for industrial processing in Brazil. The main method of control is the preventive application of fungicides. An option in the management of the disease is the adoption of the phytosanitary alert system since it allows the producer to decide the appropriate time to carry out the fungicide applications. The objective of this work was to evaluate the methodology of the phytosanitary alert system "TomCast" for the control of septoria leaf spot in tomato culture for industrial processing in the city of Morrinhos. The experimental design was complete randomized blocks, with five treatments and eight repetitions. The treatments consisted of fungicide application according to a fixed weekly application schedule and VSD 15, 20 and 25. The control was composed of plants without fungicide treatment. For experiment I, there was no incidence of septoriosis. In experiment II, it was evident that the fixed-calendar treatment was effective in controlling septoriosis, demonstrating better performance for total productivity and the benefit / cost ratio. In experiment III, the predictive treatment VSD 25 reduced 37.5% of the number of fungicide sprays, without affecting total productivity and generated satisfactory economic viability.