Practical information on the scolytid beetles of North American forests. I. Barkbeetles of the genus Dendroctonus

 
9781231178034: Practical information on the scolytid beetles of North American forests. I. Barkbeetles of the genus Dendroctonus
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1909 Excerpt: ... 5 mm. long, with broad grooved head, sides of prothorax but slightly narrowed toward the head, finely to rather coarsely punctured, and elytra with slightly coarse rugosities toward the base and declivity, the latter withafewlong hairs. (Seefig.34.) Itattacks healthy, injured, and felled western yellow pine in central Arizona, and evidently excavates galleries similar to those of the southwestern pine beetle, with which it is usually confused. The larvae make concealed food burrows in the inner bark, and transform to pupae and adults in individual cells in the outer bark. Like the other species, its destructive work would be indicated by pitch tubes on the trunk and by the fading yellowish to reddish foliage. FIG. 83.--The Ari zon a pine beetle ( Dendroctonus ari2onicus): Adult. Greatly enlarged. (Author's illustration.) SEASONAL HISTORY. This species was not recognized as distinct from the southwestern pine beetle until after the principal field observations had been made, and while many specimens were collected they were nearly always associated with the latter in similar galleries; therefore there is somewhat meager evidence on which to base conclusions relating to seasonal history, habits, etc. Apparently, however, its habits are in most respects similar to those of the southwestern pine beetle. although it is distinctly separated by specific characters. It is more nearly related to the southern and smaller Mexican pine beetles than to any other species, and therefore it may be found that it has two generations, and a partial third, annually. It is also probable that under isolation and favorable conditions it may, like the southern pine beetle, become very destructive. (See "Economic features" and "Methods of control" under Nos...

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9781343385634: Practical Information On The Scolytid Beetles Of North American Forests. I. Barkbeetles Of The Genus Dendroctonus

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9781276478779: Practical Information On The Scolytid Beetles Of North American Forests. I. Barkbeetles Of The Genus Dendroctonus...

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