MANEJO DE Meloidogyne javanica NA CULTURA DA CANA-DE-AÇÚCAR

Abstract

The production of sugarcane (Saccharum L.) plays a major economic and social role in Brazil, and the gnat-forming nematodes of the genus Meloidogyne are responsible for significant reductions in the productivity of sugarcane plantations. In order to identify alternatives for managing nematodes in sugarcane, the aim of this study was to evaluate the efficiency of chemical and biological nematicides applied at planting during the development of sugarcane parasitized by Meloidogyne javanica. The trial was conducted in polypropylene troughs, 2.12m long and 0.71m wide with a capacity of 310 liters, arranged in a randomized block design (RBL) with 7 treatments applied via the planting furrow (SL) and 5 replications, as follows: T1- Witness without nematicide, T2- Cyclobutrifluram (0.1 L. ha-1), T3- Fluensulfone (1 L.ha-1), T4- Bacillus velezensis (0.4 L.ha-1), T5- Fluopyram (1 L.ha-1), T6- B. subtilis + B. licheniformis (0.2 Kg. ha-1) and T7- Abamectin 84 SC (1 L.ha-1). At 60, 120, 180 and 240 days after inoculation (DAI), the fresh root mass (MFR) and aerial part mass (MFPA), tiller number and population density of M. javanica/10g of root and in 100cm³ of soil were assessed. The data was submitted to analysis of variance and the means were compared using the Scott-Knott test, while the times were compared using the Tukey test at 5% significance. All the treatments controlled the nematode in the evaluation carried out at 180 DAI. The highest control averages were obtained for the treatments using Cyclobutrifluram and Fluopyram. The control index provided by B. velezensis was higher than that of the treatment using B. subtilis + B. licheniformis at all evaluation times. The highest stalk weight was observed for the B. velezensis treatment, followed by the Cyclobutrifluram and Fluensulfone treatments.