File:Indian forest insects of economic importance. Coleoptera (1914) (14782772182).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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s in the year has not yet been definitely ascertained,but it will not be less than four. The life history, as detailed above, shows that the insect is a generationahead of siwalikensis in April, since the first beetles of the year of thelatter only appear in this month, the long cold winter in the northaccounting for the difference. The life history of the insect in the Terminalia toinentosa is similar tothat in the sal. Owing to the bark of this tree being somewhat thinner,to its drying quicker, and to its being whiter inside, the galleries of theinsect are more clearly defined than in the sal. (Cf. plates xlii and xliv.) I first noticed the attacks of this insect in the Chota Nagpur sal forests between the years 1894 and 1897. In 1909 I had anDamage Committed .^ Jr . . ,.,.;. in the Forest. opportunity of studying its life history in the Mandla division of the Central Provinces. My visit was at anopportune time, since, in addition to the cold-weather fellings, a new road PLATE XI.IV
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Section of stem of a sal (S/iorca robust a) tree showing the egg and larval galler.es ofSphaerotrypes ^li>lntlits, IHandford, on the outer sapwood. Mandla, Central Provinces,April 1909. FAMILY SCOLYTIDAE 489 was being driven through a portion of the fine sal forests, and a consider-able number of sal-trees had been felled on the line, of which some stillremained lying unbarked in the forest. Scarcely one of these trees (sal andTerminalia) had escaped the attacks of this insect, and nearly the whole ofthe logs and brushwood left from the cold-weather fellings had bred out ageneration of the beetle. Trees felled in January were at once tunnelledinto by the beetles which appeared on the wing in the forest in February ;and those which were not too dry or had been felled at a later date wereinfested by the generation of beetles issuing in April In this latter monththe beetles were swarming in large numbers in the forest wherever newlyfelled trees were situated or where standing dying tr

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