Preliminary studies on antitermetic properties of common woods of Pakistan and their extractives
Preliminary studies on antitermetic properties of common woods of Pakistan and their extractives
Hanif Gul, M.I. Chaudhry M. Farooq and Rahmatullah Jan
ABSTRACT
Studies on the natural resistance of common timbers of Pakistan against termites were initiated in the Pakistan Forest Institute, Peshawar under a PL-480 Project to obtain information valuable for more efficient utilization. For testing the natural resistance of woods, stakes of 25 x 4 x 3 cms size of P. wallichiana, A. B. Jackson P. roxburghii, Sargent Patanus orrientalis, L. Dalbergia sisso Roxb, Melia azadarach, L., Salmalia malabarica (D.C.) Schott and Endlicher, Acacia nilotica, L. Albizia lebbek, (L). Eucalyptus camaldulensis, Populus euramericana, Juniperus excelsa M.B. Cedrus deodare (Roxb Ex. Lanb) G. Don and Morus indica L. were installed in the termites activity areas in different ecological zones during 1985-86. Observations recorded revealed that Platanus orientalis, L. Melia azadarach Linn and Dalbergia sissoo Roxb. Out of the broad leaved species and Cedrus deodara (Roxb Ex. Lanb) G. Don in the coniferous timbers showed antitermitic properties at Peshawar, National Park Lalsoharna (Bahawalpur) and Changa Manga so far.
Wood extractives of Cedrud deodara (Roxb Ex. Lanb) G.Don inner and outer wood portions, Abies webbiana, Lindl., P. roxburghii.Sargent inner and outer portion and Platanus orientalis. L. heart woods were extracted with Acetone solvent in the soxhelt apparatus. The laboratory trails of the wood extractives revealed that termites longevity was minimum in the Platanus orientalis, L. among the broad leaved tree species and Cedrus deodara Roxb Ex. Lanb and P. roxburghii Saragent from conifers while in Abies webbiana Lindl there was no significant difference in extractives and check (no treatments).
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