Citation
Baksha M.W., . and Crawley M.J., . Effect of defoliation on the growth of teak. pp. 312-317. ISSN 0128-1283
Abstract
BAKSHA M.W. CRAWLEY M.J. 1998. Effect of defoliation on the growth of teak. In a one-year-old teak (Tectona grandis) plantation at Kaptai Bangladesh manual defoliation (25 50 75 and 100 per cent) 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 per cent in height 19-51 per cent in basal area and 23-62 per cent in volume increments depending on the intensity of defoliation as compared to the unsprayed control. However the losses were about 28-57 per cent 53-72 per cent and 58-79 per cent respectively compared to the sprayed control. The sprayed control that excluded all potential herbivores afforded about 16 per cent in height 42 per cent in basal area and 45 per cent 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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Abstract
BAKSHA M.W. CRAWLEY M.J. 1998. Effect of defoliation on the growth of teak. In a one-year-old teak (Tectona grandis) plantation at Kaptai Bangladesh manual defoliation (25 50 75 and 100 per cent) 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 per cent in height 19-51 per cent in basal area and 23-62 per cent in volume increments depending on the intensity of defoliation as compared to the unsprayed control. However the losses were about 28-57 per cent 53-72 per cent and 58-79 per cent respectively compared to the sprayed control. The sprayed control that excluded all potential herbivores afforded about 16 per cent in height 42 per cent in basal area and 45 per cent 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.
Additional Metadata
| Item Type: | Article |
|---|---|
| Additional Information: | Summaries (En Ms) |
| AGROVOC Term: | TECTONA GRANDIS |
| AGROVOC Term: | DEFOLIATION |
| AGROVOC Term: | GROWTH |
| AGROVOC Term: | HYBLAEA PUERA |
| AGROVOC Term: | PLANT PROTECTION |
| AGROVOC Term: | PLANTATIONS |
| AGROVOC Term: | BANGLADESH TECTONA GRANDIS |
| AGROVOC Term: | DEFOLIACION |
| AGROVOC Term: | CRECIMIENTO |
| AGROVOC Term: | HYBLAEA PUERA |
| Depositing User: | Ms. Norfaezah Khomsan |
| Last Modified: | 24 Apr 2025 05:52 |
| URI: | http://webagris.upm.edu.my/id/eprint/17759 |
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