Influence of manipueira on Meloidogyne javanica in soybean

Abstract

Searching alternatives for the control of plant parasitic nematodes, nematicide effect of secondary metabolites or plant residues has been studied. Thus, the manipueira, a liquid residue obtained from the industrialization of cassava (Manihot esculenta), has as its composition cyanogenic glycosides with antimicrobial properties. The objective of this study was to evaluate the potential of the manipueira applied to the soil, aiming at the control of Meloidogyne javanica in the soybean crop. The manipueira was applied at the concentrations of 0, 10, 20, 30, 40, 50, 60, 70, 80, 90 and 100%. The experimental design was completely randomized, in an 11 × 2 factorial arrangement (concentrations of manipueira × forms of application - single and fractionated), with five replicates. Soybean plants were inoculated with 3000 eggs and J2 of M. javanica per pot. Sixty days after the first application of the manipueira, agronomic characteristics and parasitism were evaluated. The single application of the manipueira promoted greater growth and root development, as well as a reduction in the number of eggs and juveniles in the roots and in the reproduction factor of M. javanica, for all concentrations. The split application had more effect on reducing the number of galls and egg mass. The lethal manure concentrations for 50% of the soil and root nematode populations were 37.90% and 29.67%, respectively.