File:Indian forest insects of economic importance. Coleoptera (1914) (14780707384).jpg

Identifier: indianforestinse00stebuoft (find matches)
Title: Indian forest insects of economic importance. Coleoptera
Year: 1914 (1910s)
Authors: Stebbing, Edward Percy, 1870-1960
Subjects: Beetles Forest insects -- India Trees -- Diseases and pests
Publisher: London Eyre & Spottiswoode
Contributing Library: Earth Sciences - University of Toronto
Digitizing Sponsor: MSN

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dered an advantage, since it gives time for the growth of others toreplace it. In reality, however, the position of affairs is very different.Trees so infested merely serve as centres of infection for neighbouringunattacked trees, and the insects will go on laying in them until the treeshave arrived within a year of death. No beetle will then oviposit in them,since an abundance of fresh sappy bark and wood is essential for the grubsfood, Cutting out dead trees, therefore, has absolutely no effect one wayor the other in mitigating the damage done by the pest. The detection of infested trees is comparatively simple. (a) Seriously Affected Nearly Dead Trees or Dead Trees.—These areeasily recognized. Large areas of the bark will have fallen away, disclosingthe wrood beneath deeply scored with the galleries of the larvae, some ofwhich may be still filled with the large masses of chewed wood and fibrousexcreta. If this latter has already fallen from the galleries, the pulling off PLATE XX
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A living willow-tree infested by the grubs of . Eolesthes .<<vt<i, Solsk. Tlie numerouslarval galleries in the sapwood are visible where the bark of the tree has fallen away.Quetta, 1905. FAMILY CERAMBYCIDAE 315 of another portion of the bark will disclose masses of it in situ in thegalleries; from one portion of the gallery a hole will be seen proceedingdown into the wood, and if this is traced downwards the empty pupalchamber will be found. (b) Trees Less Badly Attacked, but which will Eventually Die under theAttacks.—Holes and small rotting areas on the bark, often at the junctionof branches with the main stem, are visible, and, below these, exudationsof sap, either fresh and trickling or dried to the bark beneath the hole.These exudations are usually in large irregular masses, tailing off belowinto thin trickles, the sap having dried on its way down the stem. PL viishows a heavy outflow of sap down a poplar-tree. If some of these holeswith the fresh exudations trickling

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