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Attack of Teak Canker Grub, Dihammus Cervinus Hope (cerambycidae : Coleoptera) and Its Control in Teak Plantations of Bangladesh

M. W. Baksha
Bangladesh Forest Research Institute, P.O. Box 273, Chittagong-4000, Bangladesh.

Abstract/ Executive Summary:

This paper reports the infestation of teak canker grub, Dihammus cervinus Hope (Cerambycidae:Coleoptera) in teak plantations of Bangladesh. It deals with the nature and extent of damage, distribution, life history, number of generation and host plants of the pest and its control measures. The pest affected on an average 14% of the saplings. The attack was found mainly during the age of 2-6 years with a peak in the third year. The pest was more prevalent in Chittagong Hill Tracts (North and South) than in Chittagong or Cox's Bazar Forest Divisions. An infested sapling often contained one canker, but it might have up to four cankers. A canker usually contained one larva but it might have 2-3 larvae. Most of the cankers were found at or near the base of the saplings. About 10% of the infested saplings were found broken at the cankered site. As regards to control measures, application of carbofuran, 5G@6gms/sapling at the base and subsequently watered gave nearly 70% mortality of the larvae.

Keywords: Platation, Control measure, Dihammus cervinus, Teak canker

Location: Chittagong and Cox's Bazar

Start Date: 01-01-1983

End Date: 30-06-1993

Program Area: Pest Management

Commodity: Teak

Objectives:

To study the pest problems and devise its control measures.

Methodology:

The study was conducted during 1983-93. Extensive field surveys were made to about 25 teak plantations of Chittagong, Chittagong Hill Tracts (North and South) and Cox's Bazar Forest Divisions. The nature and extent of damage were noted. The adults were reared from infested plants netted with wire at Dhoom, Chittagong and later identified in the laboratory of the Bangladesh Forest Research Institute, Chittagong. Field and laboratory notes were taken on the biology and ecology of the pest. Chemical control measure was applied using carbofuran 5G at a heavily infested plantation at Ultacheri, Rangamati. Six grams of the granular insecticide was mixed with the soil around the base of the infested saplings and subsequently watered, so that the insecticide leached down to the root zone. While mixing the insecticide with the soil around the base of the saplings care was taken to minimize the root damage as far as possible. Data on the mortality of the borer were taken one month after the application of the insecticide.

Source of Information: Bangladesh Journal of Forest Science, Jan-Dec. 1996, Vol.25(1&2), pp:37-42, ISSN:1021-3279.

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The pest was more prevalent in Chittagong Hill Tracts (North and South) than in Chittagong or Cox's Bazar Forest Divisions. An infested sapling often contained one canker, but it might have up to four cankers. A canker usually contained one larva but it might have 2-3 larvae. Most of the cankers were found at or near the base of the saplings. About 10% of the infested saplings were found broken at the cankered site. As regards to control measures, application of carbofuran, 5G@6gms/sapling at the base and subsequently watered gave nearly 70% mortality of the larvae.

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