Autoria: OLIVEIRA, P. G. de; QUEIROZ, M. A. de; LIMA NETO, I. da S.; CASTRO, J. M. da C. e; OLIVEIRA, R. S. de

Resumo: Guava decline is a complex disease caused by the interaction between Meloidogyne enterolobii and Neocosmospora falciformis (Syn.: Fusarium solani). Thus, selecting M. enterolobii-resistant genotypes within the genus Psidiumis essential for controlling this disease, and developing a resistant cultivar of Psidium guajava could significantly impact this issue. Thus, the objective of this study was to assess the response of the guava plants of the cultivar Paluma to different densities of M. enterolobii inoculum. Guava seedlings were inoculated with 500, 1,000, 5,000, 10,000, and 20,000 eggs + second-stage juveniles (J2) of M. enterolobii per plant. Root and shoot fresh weights, shoot dry weight, root length, plant height, and stem base diameter were evaluated at 70 and 135 days after inoculation (DAI). Total number of M. enterolobii eggs + J2 in the root system and nematode reproduction factor nematode were assessed. Nematode multiplication in roots was not proportional to increases in initial inoculum density; thus, the best plant responses to nematode multiplication in the evaluated cultivar were found for the lowest tested densities. The reproduction factor decreased as the inoculum density was increased, at both evaluations (70 and 135 DAI).

Ano de publicação: 2024

Tipo de publicação: Artigo de periódico

Unidade: Embrapa Soja

Palavras-chave: Declínio-da-goiabeira, Doença de Planta, Fator de reprodução, Goiaba, Guavas, Meloidogyne enterolobii, Nematoide-das-galhas, Nematóide, Plant diseases and disorders, Psidium Guajava, Root-knot nematodes, Variedade Paluma