CONTORLE ALTERNATIVO DE Meloidogyne enterolobii MEDIANTE A UTILIZAÇÃO DE EXTRATOS DE CRAVO-DE-DEFUNTO (Tagetes patula e Tagetes erecta)

Abstract

The phytonematodes of the genus Meloidogyne are the most important in world agriculture. The species M. enterolobii is considered worrying because it is emergent and has high reproductive capacity and aggressiveness. Therefore, studies of effective control methods are needed to control this pathogen. Therefore, the objective of this work was to evaluate the hatching of second-stage juveniles of M. enterolobii using leaf and flower extracts of Tagetes patula and T. erecta. The experiment was carried out at the Agricultural Nematology laboratory of the Instituto Federal Goiano – Campus Morrinhos, using a completely randomized design, with ten treatments and five replications. The assay was carried out in test tubes containing 350 eggs mL-1 of M. enterolobii and leaf and flower extracts of Tagetes patula and T. erecta were used at concentrations of 0.16, 32, 64, 80 and 100 µL- 1. The hatched juveniles (J2) and the remaining eggs were quantified after five days of incubation, with the aid of a photonic microscope, at a magnification of 100X. Data analysis was performed using the Sisvar program by the Scott-Knott Test at 5 % probability. The most prominent concentrations of the T. patula extract were 100 and 16 µL-1, causing a reduction in the hatching rate of 53.06 and 48.97%, respectively. Regarding the T. erecta extract, the highlighted concentrations were 64 and 80 µL-1, reducing hatching by 71.42 and 61.22%, respectively. Based on the results, it was verified that both T. patula and T. erecta extracts have the potential to be used as nematicides to control M. enterolobii.