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Abstract

A study was conducted on the natural durability evaluation of 30 Indian timber species under marine condition at the fishing harbour, Krishnapatnam (Longitudinal: 800 10’ to 800 16’ E and Lateral: 130 28’ to 130 59'N) during November, 1997 to October, 1998. Most of the species tested in the present study are potential timber species widely used for fishing craft and harbour structures. Observations of this study indicate that none of the species was free from borer attack and all the timber species were severely destroyed within a short period of 3 to 7 months, indicating their very poor durability against marine borers. Even, species having specific gravity of 0.8 were severely damaged due to heavy attack of both pholads and teredinids. Of the species tested, Bischofia javanica, Ceiba pentandra, Elaeocarpus recurvatus and Michelia champaca offered least resistance to borer attack. However, Gmelina arborea, Haldina cordifolia and Xylia xylocarpa exhibited maximum resistance. Others species fall in the intermediate category. In all 18 species of wood borers were identified, of which 8 species i. e. Martesia striata, M. nairi, Teredo furcifera, T. fulleri, Lyrodus pedicellatus, L. affinis, Bankia campanellata, and B. carinata were dominant ones, played a major role in destruction of timber species. Results of this study are compared with those of other parts of the Indian harbours and discussed in this paper.

Keywords

NATURAL DURABILITY INDIAN TIMBERS MARINE ENVIRONMENT KRISHNAPATNAM HARBOUR INTRODUCTION

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Natural Durability of Indian Timbers Under Marine Environment at Krishnapatnam Harbour,East Coast of India,Andhra Pradesh

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