Effect of defoliation on the growth of teak

Baksha M. W., . and Crawley M. J., . Effect of defoliation on the growth of teak. pp. 312-317. ISSN 0128-1283

In a one-year-old teak (Tectona grandis) plantation at Kaptai Bangladesh manual defoliation (25 50 75 and 100) in june simulating the damage caused by the larvae of teak defoliator Hyblaea puera Cramer (Hyblaeidae: Lepidoptera) was carried out. Four years of such defoliation caused significant losses of about 14-49 in height 19-51 in basal area and 23-62 in volume increments depending on the intensity of defoliation as compared to the unsprayed control. However the losses were about 28-57 53-72 and 58-79 respectively compared to the sprayed control. The sprayed control that excluded all potential herbivores afforded about 16 in height 42 in basal area and 45 in volume increments against those of the unsprayed control. Loss of volume increment is a serious impact of defoliation. Protection during the early years would be advantageous because of the higher absolute increment of teak at this stage. None of the trees defoliated showed mortality or leading shoot dieback.

Full text available from: Official URL: http://www.frim.gov.my/v1/JTFSOnline/jtfs/v10n3/31...

Abstract

In a one-year-old teak (Tectona grandis) plantation at Kaptai Bangladesh manual defoliation (25 50 75 and 100) in june simulating the damage caused by the larvae of teak defoliator Hyblaea puera Cramer (Hyblaeidae: Lepidoptera) was carried out. Four years of such defoliation caused significant losses of about 14-49 in height 19-51 in basal area and 23-62 in volume increments depending on the intensity of defoliation as compared to the unsprayed control. However the losses were about 28-57 53-72 and 58-79 respectively compared to the sprayed control. The sprayed control that excluded all potential herbivores afforded about 16 in height 42 in basal area and 45 in volume increments against those of the unsprayed control. Loss of volume increment is a serious impact of defoliation. Protection during the early years would be advantageous because of the higher absolute increment of teak at this stage. None of the trees defoliated showed mortality or leading shoot dieback.

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Item Type:	Article
AGROVOC Term:	Tectona grandis
AGROVOC Term:	Teak
AGROVOC Term:	Defoliation
AGROVOC Term:	Growth
AGROVOC Term:	Pests
AGROVOC Term:	Larvae
AGROVOC Term:	Insecticides
AGROVOC Term:	Mortality
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	24 Apr 2025 06:27
URI:	http://webagris.upm.edu.my/id/eprint/22554

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