Densidade inicial de inóculo, época de avaliação e reprodução de Meloidogyne enterolobii em goiabeira 'Paluma'

Patrícia Gomes de Oliveira; Manoel Abilio de Queiroz; Izaías da Silva Lima Neto; José Mauro da Cunha e Castro; Ronaldo Simão de Oliveira

doi:10.1590/1983-21252024v3711440rc

Autores

Patrícia Gomes de Oliveira Department of Biological Sciences, Universidade Estadual de Feira de Santana, Feira de Santana, BA, Brazil https://orcid.org/0000-0002-8232-824X
Manoel Abilio de Queiroz Departament of Social Sciences and Technology, Universidade do Estado da Bahia, Juazeiro, BA, Brazil https://orcid.org/0000-0001-9501-2343
Izaías da Silva Lima Neto Universidade Federal do Vale do São Francisco, Petrolina, PE, Brazil https://orcid.org/0000-0002-7557-1102
José Mauro da Cunha e Castro Embrapa Soja, Londrina, PR, Brazil https://orcid.org/0000-0003-1345-6042
Ronaldo Simão de Oliveira Instituto Federal de Ciência e Tecnologia, Xique Xique, BA, Brazil https://orcid.org/0000-0003-0996-9144

DOI:

https://doi.org/10.1590/1983-21252024v3711440rc

Palavras-chave:

Psidium guajava. Nematoide-das-galhas. Fator de reprodução.

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 Psidium is 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).

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