Resistance to Meloidogyne mayaguensis in Psidium spp. Accessions and their grafting compatibility with P. guajava cv. Paluma

• Autor(a) principal: Carneiro,Regina M.D.G.
• Data de Publicação: 2007
• Outros Autores: Cirotto,Pedro Augusto, Quintanilha,Alípio P., Silva,Dijalma B., Carneiro,Rui G.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Fitopatologia Brasileira
• Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-41582007000400001
• topic: root-knot nematode; guava; rootstock; Psidium cattleyanum; Psidium friedrichsthalianium

Meloidogyne mayaguensis has been reported in some states of Brazil causing severe damage on commercial guava (Psidium guajava L.). Accessions of Psidium spp. were selected from a collection maintained in Embrapa Clima Temperado (Pelotas, Rio Grande do Sul State). Plants of different accessions were grown from seed in plastic bags and, when they reached 15-20 cm in height, were inoculated with 10,000 eggs/plant of M. mayaguensis. Eight months after inoculation, the different accessions were evaluated for resistance to M. mayaguensis. Three accessions of P. guajava were highly susceptible (RF=59.2) to this nematode. Psidium friedrichsthalianium was considered to be moderately resistant (RF=1.9). Three accessions of P. cattleyanum were immune to M. mayaguensis (RF = 0). When used as rootstocks P. cattleyanum and P. friedrichsthalianium were compatible with P. guajava cv. Paluma. Considering these results, the use of resistant rootstocks provides a promising control method for M. mayaguensis in commercial guava crop.