Reação de plantas de cobertura a diferentes populações de Meloidogyne javanica

Abstract

ABESTRACT: Meloidogyne javanica is considered to be one of the main phytonematoids due to its wide territorial spread and host range. Among the methods for management, crop rotation with the use of bad host plants or antagonists stands out. However, M. javanica polyphagy makes it difficult to choose non-host cultures to compose the management system. Still, there are hypotheses that this species of nematode may present a variable pathogenicity between different populations. In this sense, the present study aimed to evaluate the reaction of cover plants to different populations of Meloidogyne javanica. The samples were collected between March and May / 2017 and were sent to the State University of Maringá, where they were kept in a greenhouse for multiplication. After multiplication, the samples were used to inoculate seedlings of Crotalaria spectabilis, C. ochroleuca, C. juncea, turnip (Raphanus sativus), dwarf pigeon (Cajanus cajan) cv. Iapar 43, buckwheat (Fagopyrum esculentum) cv. IPR 92 - Altar, three cultivars of millet (BRS 1501, ADR 300 and ADR 500) and soybean (control) and 60 days after inoculation (DAI) evaluated for gall index (IG), nematode per gram of root and factor of reproduction (FR). M. javanica populations showed pathogenic variations in all studied plants. Soy behaved as susceptible to all populations