Threat to cedar, Cedrela odorata, plantations in Vietnam by the weevil, Aclees sp.

Pham Quang Thu1*, Dao Ngoc Quang1, and Bernard Dell2

1Forest Science Institute of Vietnam, Hanoi, Vietnam
2Institute of Sustainable Ecosystems, Murdoch University, Perth, Australia

Abstract

The recent decline and death of young cedar, Cedrela odorata L. (Sapindales: Meliaceae), plantations in Vietnam is caused by Aclees sp. (Coleoptera: Curculionidae), a wood-boring brown weevil. A field study was undertaken in three-year-old plantations in two districts in Thanh Hoa province in August 2008. Trees were heavily impacted by the weevil, Aclees; the infestation level (P) ranged from 80 to 100% and the average damage index (R) ranged from 1.8 to 2.8. Observations over one year enabled the life history to be determined. Eggs were laid (February to March, September to November) inside the bark from the base of the trunk up to 60 cm in height. Larvae formed extensive feeding tunnels in the inner bark and sap wood. Pupation occurred in feeding tunnels or pupal chambers in the sapwood. Adults emerged twice a year, February to March and August to October. It is concluded that Aclees is a threat to C. odorata plantations in tropical regions of the world, and quarantine measures should be implemented to reduce the risk of spread.

Keywords: Curculionidae, Hylobina, Spanish cedar, tree death, wood borer

Correspondence: *phamquangthu@fpt.vn

Received: 13 October 2009 | Accepted: 16 June 2010 | Published: 4 November 2010

ISSN: 1536-2442 | Volume 10, Number 192

Thu PQ, Quang DN, Dell B. 2010. Threat to cedar, Cedrela odorata, plantations in Vietnam by the weevil, Aclees sp. Journal of Insect Science 10:192, available online: insectscience.org/10.192


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