The growth and yield models/tables for Gmelina arborea Roxb. (gamar) in the plantations of Bangladesh have been prepared based on site indices. Models were derived by the data collected from permanent sample plots and also from temporary sample plots. Step-wise and all probable combinations of the independent variables methods were used to select the best suited models subject to the satisfaction of the statistical and biological requirements. Models were selected to estimate the stand dbh,stand mean height,stand basal area per hectare, total overbark volume yield per hectare and underbark volume yield per hectare upto top-end diameter of 10.0 cm. The yield prediction models derived in the study could satisfactorily be used for gamar plantations within the limitations ofstands of ages 3-12 years and site indices of 7.5 to 20.0 meters based on a base age of 12 years.

The effect of wax emulsion varying in concentration from 0 to 1.5% at 0.5% increments on the strength and dimensional stability of urea formaldehyde bonded particleboard at three glue levels, 8%, 10% and 12% has been observed. Results show that the addition of wax emulsion is useful to manufacture particleboard at low glue level, viz., 8% and 10%. But it does notshow any appreciable effect on the board made with 12% glue.

The properties of particleboards improve with increasing addition of wax emulsion for 8% glue and for 10% glue, the addition of 1% wax has beneficial effect on all the properties under investigation. Beyond this, further improvement is not marked. A combination of 10% glue and 1% wax is found advantageous to manufacture strong particleboard having good dimensional stability.

Seven plant species have been recorded as hosts of teak defoliator, Hyblaea puera Cram. (Hyblaeidae: Lepidoptera) in Bangladesh. Of them Avicennia officinalis Linn., a mangrove species, is a new host record of H. puera. The food preference ofthe pest larvae was evaluated for all the host plantspecies. Tectona grandis Linn, wasfound to be the most preferred food followed by Avicennia officinalis Linn., Callicarpa arborea Roxb., Vitex peduncularis Wall., V. pubescens Vahl., V. negundo Linn, and Oroxylunt indicum Vent.