Controle alternativo de macrófitas aquáticas infestantes de reservátorios

Abstract

The excessive and accelerated growth of aquatic macrophytes along with the great damage that these weeds cause in reservoirs has instigated several researchers to discuss ways to control these plants. Considering that the traditional methods of control either cause logistical problems (mechanical) or environmental problems (chemical) and from these gaps the potential of a bioherbicide is inserted as an alternative for the control of aquatic macrophytes. The prospection was made from systemic collections of the species Eichhornia crassipes, Pistia stratiotes and Salvinia herzogii after this collection the tissues were disinfected and conditioned, where they were repotted in culture medium and grown during a period of 14 days. Potential microorganisms were divided into sample units and from these organisms a potential bioherbicide was produced where its evaluation was made with an entirely randomized design divided into 3 repetitions for each treatment with a control, being performed visual evaluations based on the methodology proposed by the Brazilian Weed Science Society. The biocompounds did not show visible damage in E. crassipes so its data are not exposed, the other species showed damage at 15 days after application, and after this DAT the damage increased, the microorganisms called GAO and GAGR2 were more successful causing damage up to 40% in some repetitions. And in the analysis of fresh mass this same pattern was repeated with the GAO treatments where there was a decrease of about 18% in PV (live weight) thus confirming the effectiveness of the treatment of Trichoderma + Verticillum for a possible control of the species E. crassipes and P. stratiotes.