Podridão-do-lenho em plantios homogêneos de Acacia mangium

Abstract

Resumo -O objetivo deste trabalho foi relatar a ocorrência da podridão-do-lenho em plantios homogêneos de Acacia mangium no Estado de Roraima. A observação dos sintomas iniciais em ferimentos de poda indica que a desrama artificial é um fator de predisposição. Estimativas realizadas em dois talhões comerciais constataram cerca de 8 e 39% de incidência da doença em árvores de três anos. Isolamentos a partir de árvores sintomáticas e testes de patogenicidade demonstram que Lasiodiplodia theobromae pode contribuir no processo de podridão. Este é o primeiro relato da podridão-do-lenho em A. mangium no Brasil, o que pode limitar sua exploração comercial.Termos para indexação: Racosperma mangium, podridão-do-cerne, patologia florestal. Heartrot in homogeneous stands of Acacia mangiumAbstract -The objective of this work was to report the occurrence of heartrot in homogeneous stands of Acacia mangium in the State of Roraima, Brazil. Observations of symptoms initiating from pruning wounds indicated that the artificial pruning is a predisposing factor. A survey carried out in two commercial stands showed 8 and 39% of disease incidence in three-year-old trees. Isolations performed from symptomatic trees and pathogenicity tests demonstrated that the fungus Lasiodiplodia theobromae can incite the rot development. This is the first record of A. mangium heartrot in Brazil. The disease can restrict its commercial exploration.

Incidences and severity of vascular wilt in Acacia mangium plantations in Sabah, Malaysia

“…During early domestication,the species showed promising potentials for forest plantation due to its fast growth, adaptability to marginal soils, and relatively free of pests and diseases which lead to large-scale commercialization. Presently, there are sufficientreports of pests and diseases symptoms affecting the species withheart rot and root rot as the most severe diseases which in turns affects solid-wood production [4,22]. Other symptoms observed in A. mangium plantations include foliar spots and necrosis, powdery mildew, rusts, stem cankers and pink disease [6,19,[24][25].…”