Hospedabilidade de Meloidogyne enterolobii em diferentes espécies vegetais no Estado do Rio de Janeiro

Abstract

Meloidogyne enterolobii (M. mayaguensis) is nematode specie found in several Brazilian states, parasitizing guavas and other crops. This work aimed to evaluate the reaction of thirty-two plants species to M. enterolobii in the State of Rio de Janeiro. The experiment was conducted in the greenhouse conditions. The population of the M. enterolobiii used in this study was obtained from roots of guava cv. “Paluma” infested from the municipality of São João da Barra - RJ. The inoculum was multiplied in tomato (Solanum Lycoperyicum) cv. TRural I grown in containers of two liters, with previously autoclaved substrate, which received 5.000 eggs/juveniles/plant. Assessments were made at 90 days after inoculation. Plant roots were processed using Hussey and Barker technique and the population of eggs, juveniles and adults were estimated with the help of Peters counting chamber under an optical microscope. It was determined the final population (Pf) and the reproduction factor (RF), defined as the ratio Pf/Pi, where Pi is the initial population. From the thirty-two plants analyzed, fifteen were susceptible: zucchini (Curcubita moschata Duch), loofah (Luffa cylindrica), white bottlebrush (Callistemon rigidus R. Br), red bottlebrush (Callistemon rigidus R. Br), Brazilian guave (Psidium guineensis), sugarcane var. RB 956911(Saccharum hybrid var. RB 956911), sugarcane var. RB 867515 (Saccharum hybrid var. RB 867515), sugarcane var. RB 92579 (Saccharum hybrid var. RB 92579), sugarcane var. SP 801816 (Saccharum hybrid var. SP 801816), antlerpepper (Capsicum baccatum), hotpepper (Capsicum chinense), tomato cv. TRural I (Solanum lycopersycum cv. TRural I), fisália (Physalis angulata), scarlet eggplant (Solanum gilo) and eggplant (Solanum melogena L.). Two were immune: ornamental eucalyptus (Eucalyptus tereticornis) and ox guava (Eugenia stipilata); and fifteen were resistant: count the fruit (Annona squamosa), curly parsley (Petroselinum crispum), pearl pineapple (Ananas cosmosus L. Merril), purple basil (Ocimum pupuraceus), cambuci (Campomanesia phaea), fragrant eucalyptus (Eucalyptus citriodora), eucalyptus (Eucalyptus grandis), pear guava (Psidium acutangulum), yellow guava (Psidium cattleyanum), purple guava (Psidium myrtoides), biribiri (Averrhoa bilimbi L), carambola (Averrhoa carambola L), yellow passionflower (Passiflora maliformis L), rattlepod (crotalaria juncea L) e gray mucuna (Mucuna cinérea cv. gray mucuna ).