Controle de Radopholus similis em bananeira com resíduo líquido do desfibramento de folhas de sisal

Abstract

This work aimed to evaluate the nematicidal effect of liquid sisal residue, fresh and fermented, to control Radopholus similis in banana plants. We evaluated the concentrations of 0, 5, 10, 15, 20 and 25 % of the fresh or fermented residue under laboratory and greenhouse conditions. In the latter, 'Grand Naine' banana plants were used. Plant height, pseudostem diameter, number of leaves, shoot, rhizome and root dry weight were evaluated as plant growth characteristics. Aspects such as level of damage, population levels (soil and roots) and reproduction factor of nematodes were evaluated for control. Sisal residues, both fresh or fermented, were efficient in controlling nematodes under in vitro and in vivo conditions. There were no differences in the damage caused by R. similis in banana, between the treatments with a commercial nematicide in the dosage recommended by the manufacturer, and the fresh or fermented residue at a concentration of 25 %. There was a linear decrease in the nematode total population (TP) and reproduction factor (RF) with the increasing sisal residue concentrations. The concentration of 25 % was the most effective, with a 78 % reduction in both variables (TP and RF), compared with the treatment that did not receive the residue (0%). This is the first report on the nematicidal effect of sisal liquid residue on the burrowing banana nematode. This byproduct has the potential for the development of new technologies for the control of nematodes, which can be an inexpensive and also represent a nematicide which causes less risk to the environment.