a survey of beetles damaging commercially impotrtant ... - Icrisat.ac.in

14trees. The galleries run through the sapwood ; the attacked portion is oftenkilled as a result of girdling. The grubs persist in stored timber.Sinoxylon anale (Fig. 4) and S. atratum cause considerable damage inthe storage yards of match and Plywood factories where large quantities ofthis timber are generally stored. These bore very deep in the wood, thegalleries reaching as far as the centre. Timber thus affected are often notmore than a skeleton of interwoven borer galleries. Heterobostrychusaequalis was noted to attack stored round logs as well as match veneers(Fig. 5). In stacks of veneers the borer activity was often not externallyvisible since the exposed veneers were not affected and the frass accumulatedinside between the veneers. H. aequalis is of great economic significancesince this timber species is widely used in veneer, plywood and matchindustries in Kerala. The brenthid, Trachelizus politus was noticed to breedin rotten timber.Bhasin and Roonwal (1 958) reported the following borers from thistimber - Plocaederus ferrugineus, Xystrocera globosa (Cerambycidae)Alcidodes affaber, Desmidophorus heber (Curculionidae) Xyleborusandrewesi, X. interjectus and X. kraatzi. (Scolytidae). It may be noted thatexcept for X. interjecrus none of these species were recorded during thisstudy, but 11 additional borers were found.