Economic entomology for the farmer and fruit-grower : and for use as a text-book in agricultural schools and colleges . Sphenophoriis ochreus.—Adult, larva, and work in roots o(Scirpus. covering with canvas or similar material to prevent the toorapid escape of the fumes which gradually permeate the entiremass of grain, killing everything in it. Closing the series we have the bark-beetles, or Scolytids, someof them called shot-hole borers from the little round holes withblackened edges which they make in wood and bark. Manyspecies make prettily-figured burrows between the bark and sap-wood, whi
Economic entomology for the farmer and fruit-grower : and for use as a text-book in agricultural schools and colleges . Sphenophoriis ochreus.—Adult, larva, and work in roots o(Scirpus. covering with canvas or similar material to prevent the toorapid escape of the fumes which gradually permeate the entiremass of grain, killing everything in it. Closing the series we have the bark-beetles, or Scolytids, someof them called shot-hole borers from the little round holes withblackened edges which they make in wood and bark. Manyspecies make prettily-figured burrows between the bark and sap-wood, while others bore into the solid wood, making longer orshorter galleries. Most of the species attack forest-trees, and forthem reference should be had to Dr. Packards work already cited. 238 AN ECONOMIC ENTOMOLOGY. These beetles differ from all the other weevils in their cylin-drical form and very short snout, which is scarcely more than aslight prolongation of the head, and they are usually of smallsize, most of them not exceeding one-eighth of an inch in length. Fig. Calandra granaria.—a, adult ; b, larva ; c, pupa ; d, C. oryza, adult. Scolytiis rugulosus, the fruit-bark beetle, is, perhaps, thebest known, and certainly the most important economically,attacking deciduous fruit-trees of almost all kinds. The blackparent beetles appear in early spring, and bore little round holesthrough the bark to the sap-wood. They then make a centralburrow, on each side of which little notches are made to receivethe soft white eggs. The larvae hatch very soon, and at oncebegin to make little burrows of their own, diverging as theymove from the parent channel, and gradually enlarging them asthey increase in size. When full grown they form a slightlyenlarged chamber, in which they pupate, and when they trans-form to beetles, make their way out through little round holesin the bark. The whole period of development does not exceeda month, and there may be several broods during the summer
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectinsectp, bookyear1906
