PATHOLOGY OF ANNATTO (BIXA ORELLANA L.) SEEDS.

  • Juliana Altafin Galli
  • Nilza Patrícia Ramos
  • Rita de Cássia Panizzi
  • Antônio Lúcio Mello Martins

Resumo

Annatto is a widespread species in the Tropics. Among the diseases which affect the crop, damping-off, caused by the fungi Rhizoctonia solani, Colletotrichum sp. and Alternaria sp., are seed transmitted. This research was conducted to determine seed borne pathogens and germination of 13 seed lots. The annatto seeds were obtained from a germplasm collection maintained by APTA Regional Centro Norte – Pindorama – SP – Brazil. The pathogens were analyzed utilizing the blotter test, with and without surface disinfestation and germination test. The results showed that seed surface disinfestation did not decrease frequency of fungal occurrence. Cladosporium sp., Phoma sp., Alternaria sp. and Colletotrichum sp. were the most common fungi observed in the seeds, with frequency of, 62%, 54%, 49% and 4% respectively, in disinfested seeds. Annatto is typically a backyard plant, cultivated as a single bush for domestic use, and is commonly propagated, through seeds, which are exchanged within and among local communities, thus can spread important fungi, such as Alternaria and Colletotrichum, to other area.

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Publicado
2011-03-28
Seção
Nota Científica