Some studies on the dieback disease of Acacia mangium willd

C.F.J. Bong, . and P. Primus, . and P.M. Lidadun, . (1995) Some studies on the dieback disease of Acacia mangium willd. [Proceedings Paper]

Shoot dieback is a common disease of the fast growing tree Acacia Mangium Willd. Symptoms began with chlorosis of the young leaves at the tip of the twigs or shoots followed by premature abscission of these yellowing leaves. The bare shoot began to turn brown or dark and dried up. Longitudinal section of the infected twig revealed a brown to dark pith. The die-back may advance to as far as 30-60 cm below the tip. Severe defoliation could occur in some cases. In general this disease alone did not kill the tree. Infected trees exhibited a 18.7 reduction in diameter at breast height dbh and a 15.5 decrease in height compared to healthy trees of similar age in the same area. Fungi often associated with the shoot die-back included in descending order of frequencies of isolation Phomopsis sp. Lasiodiplodia theobromae Pat. Griff. and Maubl. Colletotrichum gloesporioides Penz. Glomerella cingulata Stonem. Spauld and Schrenk. and a sterile mycelia. Pathogenicity tests on both seedlings and mature trees did not convincingly implicate any of the above fungi as causative agent.

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Abstract

Shoot dieback is a common disease of the fast growing tree Acacia Mangium Willd. Symptoms began with chlorosis of the young leaves at the tip of the twigs or shoots followed by premature abscission of these yellowing leaves. The bare shoot began to turn brown or dark and dried up. Longitudinal section of the infected twig revealed a brown to dark pith. The die-back may advance to as far as 30-60 cm below the tip. Severe defoliation could occur in some cases. In general this disease alone did not kill the tree. Infected trees exhibited a 18.7 reduction in diameter at breast height dbh and a 15.5 decrease in height compared to healthy trees of similar age in the same area. Fungi often associated with the shoot die-back included in descending order of frequencies of isolation Phomopsis sp. Lasiodiplodia theobromae Pat. Griff. and Maubl. Colletotrichum gloesporioides Penz. Glomerella cingulata Stonem. Spauld and Schrenk. and a sterile mycelia. Pathogenicity tests on both seedlings and mature trees did not convincingly implicate any of the above fungi as causative agent.

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Item Type:	Proceedings Paper
AGROVOC Term:	ACACIA MANGIUM
AGROVOC Term:	TIMBER TREES
AGROVOC Term:	DIEBACK
AGROVOC Term:	PLANT DISEASES
AGROVOC Term:	CASE STUDIES
AGROVOC Term:	METHODS
AGROVOC Term:	SHOOTS
AGROVOC Term:	FUNGI
AGROVOC Term:	PATHOGENICITY
AGROVOC Term:	SEEDLINGS
Geographical Term:	MALAYSIA
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	24 Apr 2025 05:13
URI:	http://webagris.upm.edu.my/id/eprint/11146

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