Determination of the treatment period of banana seedlings with rhizobacteria in the control of Meloidogyne javanica

Abstract

The introduction of rhizobacteria to the soil can be done via treatment of propagating materials. The aim of this work was to evaluate in greenhouse the influence of immersion periods of micropropagated ‘Prata-Anã’ banana seedling roots in suspension of different rhizobacterial isolates on the growth of seedlings and control of Meloidogyne javanica. The experiment was set up in greenhouse in a randomized block design in a 10 x 2 factorial scheme (rhizobacteria isolates) x (immersion periods: 60 and 120 minutes) with 10 replicates. The additional treatment (control) was composed of seedlings without any treatment infected with M. javanica. Treated seedlings were planted in pots containing soil: previously autoclaved sand. After twenty-four hours, suspension containing 3,000 M. javanica eggs was added to the soil. At 60 days, number of galls, egg mass and eggs per root system, number of second-stage juveniles (J2) per 100 cm3 of soil were evaluated and the reproduction factor was calculated. Shoot dry matter mass was also evaluated. Of the four rhizobacteria that reduced the reproductive capacity of the nematode, three were more efficient when seedlings were treated for 120 minutes. The treatment period of banana seedlings did not affect the shoot dry matter yield and all rhizobacteria increased the dry matter weight of seedlings infected with Meloidogyne javanica. It could be concluded that rhizobacteria have different treatment time requirements for seedlings to control the nematode, but do not interfere with the development of seedlings.

Association of Bacillus subtilis 34 and soil conditioner for promoting growth in okra plants

“…Longer and fine roots, for the same mass (same metabolic consumption), present a larger surface area and, consequently, in a higher capacity to absorb nutrients, mainly those with low mobility in the soil, such as phosphorus. The rhizobacterium evaluated in the present study (B. subtilis-34) has been shown to be efficient in promoting the growth of vegetable, common bean, and banana plants (Lopes et al, 2019a;Lopes et al, 2019b;Santos et al, 2019;Lopes et al, 2018). Most studies found in the literature evaluated rhizobacteria and water-retaining materials separately (Basyony and Abo-Zaid, 2018;Andrade et al, 2023), thus neglecting the potential synergistic effects of the combined use of these agents.…”

Utilização De Fungos Benéficos Na Formação De Mudas De Goiabeira Em Solos Infestados Com Nematoides

“…Dentre as doenças que causam distúrbios ao cultivo da goiabeira, tem-se a meloidoginose, doença considerada atualmente o principal problema fitossanitário enfrentado nos pomares de goiaba em todo o território brasileiro, pois reduz drasticamente a produtividade da cultura, podendo ocorrer a morte da planta. Produtos formulados com ingredientes ativos biológicos são avaliados no setor frutícola como método alternativo ao químico, afim de não agredir o meio ambiente (MARTINS et al, 2013;LOPES et al, 2018).…”