Rizobactérias associadas a materiais orgânicos no controle de nematoides das galhas em tomateiro

Abstract

Rhizobacteria associated with organic materials in the control of root-knot nematode in tomatoBiological control agents associated with organic matter is a strategy that can enhance the control of root-knot nematode. The objective of this study was to evaluate the effect of organic materials and rhizobacteria on Meloidogyne javanica on tomato. We used the randomized block design, in a 4x2+1 factorial scheme, four organic materials (peat, bio-fertilizer, manure and organic compound of pequi hulls), two isolates of rhizobacteria (Bacillus pumilus-1 and B. pumilus-76) and mineral fertilization alone (additional treatment), with eight replications. Tomato seedlings were transplanted to pots containing sandy soil, in which the different organic materials were incorporated. Suspensions of rhizobacteria (OD 540 = 0.5) were applied to soil by means of irrigation. The soil in each pot was infested with approximately 3,000 eggs and eventual second stage juveniles (J2) of M. javanica. All organic materials associated with rhizobacteria reduced the number of galls and masses of M. javanica eggs compared to mineral fertilizer. The number of juveniles (J2) was lower in combinations pequi + B. pumilus-1 and B. pumilus-76 and peat + B. pumilus-1. The number of eggs and the reproduction factor were influenced by the interaction between rhizobacteria and organic materials. For the compound of pequi, B. pumilus-1 produced a lower number of eggs per gram of root, while for peat, B. pumilus-76 was the most efficient. For the reproduction factor, only the manure was influenced by the bacterium, and B. pumilus-1 was the one that provided lower reproductive capacity of the nematode.

Biological products in association with organic matter to control Meloidogyne javanica in tomato

“…Thus, the association between biological control and different organic matter sources has the goal to maximize nematode control. It happens because organic wastes stimulate the growth of microorganism populations in the soil, thus favoring nematode control through competition, and increasing the number of predators and the production of secondary metabolites presenting nematicidal effects (Machado et al, 2012;Silva et al, 2016). Therefore, the aim of the current study was to assess the effect of commercial products based on fungi and bacteria, applied in association or not with different organic matter sources derived from plant and animal wastes, on the control of Meloidogyne javanica (Treub) Chitwood in tomato plants.…”

AVALIAÇÃO DO DESEMPENHO NEMATICIDA DE FARELO DE MAMONA EM COMPARAÇÃO AO CONTROLE QUÍMICO DE Meloidogyne spp. EM TOMATEIRO

“…Diversos compostos orgânicos apresentam capacidade de redução da população de nematoides pela liberação de compostos voláteis tóxicos e componentes nematicidas resultantes a sua decomposição no solo (SILVA et al, 2016). Associado a estes mecanismos de ação, a degradação do material orgânico proporciona a melhoria das características físicas e químicas do solo, promovendo condições adequadas para o desenvolvimento de plantas, além de aumentar a biodiversidade de microrganismos antagonistas aos nematoides (FERREIRA, 2012).…”