a survey of beetles damaging commercially impotrtant ... - Icrisat.ac.in
a survey of beetles damaging commercially impotrtant ... - Icrisat.ac.in
a survey of beetles damaging commercially impotrtant ... - Icrisat.ac.in
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29the sapwood and then take a longitud<strong>in</strong>al course. Timber thus affected cannot be used for saw<strong>in</strong>g planks for mak<strong>in</strong>g p<strong>ac</strong>k<strong>in</strong>g case boards as the tunnelsleave several holes on the planks.Fiq 13 - Surf<strong>ac</strong>e <strong>of</strong> plank <strong>of</strong> Hevea brasiliensis show<strong>in</strong>g holes madean undeterm<strong>in</strong>ed cerambycid. The tunnels are about1.5 cm <strong>in</strong> diameter.byThe bostrychids, S<strong>in</strong>oxylon anale, S conigerum and the lyctid,M<strong>in</strong>thea rugicollis cause major damage to sawn timber (I-1.5 cm thick)used for p<strong>ac</strong>k<strong>in</strong>g cases (Fig. 14).Planks <strong>of</strong> greater thickness are occasionally att<strong>ac</strong>kedbostrychus aequalis caus<strong>in</strong>g serious damage.by Hetero-Round logs with bark are att<strong>ac</strong>ked by the small borers, Platypus solidus,P. latif<strong>in</strong>is ( Platypodidae), Xyleborus similis (Scolytidae) and Phoenomerussundevalli (Curculionidae).The tenebrionid, Palorus corylonoides was collected from logs affectedby X. similis. Members <strong>of</strong> this genus are known to be predatory on scolytidae(Beeson, 1941 )About 30 species <strong>of</strong> borers have been recorded to att<strong>ac</strong>k this timber(Duffy, 1968; Mathur & S<strong>in</strong>gh. 1960-b). This <strong>in</strong>clude the large borer.
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