Economic entomology for the farmer and fruit-grower : and for use as a text-book in agricultural schools and colleges . ited States is the sinuate pear-borer, A. sinuatiis,imported from Europe within recent years. This feeds betweenbark and wood in pear-trees, making immensely long zig-zaggalleries, finally girdling the tree and killing it. It lives twoyears in the larval stage. In general we are very helpless against boring larvae once theyget into the trunk of a tree. Cutting out is a tedious process,even if the location of the larva is easily discoverable, which itoften is not. We must, the
Economic entomology for the farmer and fruit-grower : and for use as a text-book in agricultural schools and colleges . ited States is the sinuate pear-borer, A. sinuatiis,imported from Europe within recent years. This feeds betweenbark and wood in pear-trees, making immensely long zig-zaggalleries, finally girdling the tree and killing it. It lives twoyears in the larval stage. In general we are very helpless against boring larvae once theyget into the trunk of a tree. Cutting out is a tedious process,even if the location of the larva is easily discoverable, which itoften is not. We must, therefore, try to prevent their entrance, AN ECONOMIC ENTOMOLOGY. and this may be done more or less completely by mechanicalmeans. As against the larger species—, against all exceptAgrilus—a wire mosquito netting loosely encircling the trunk, soas not to touch it anywhere, is a complete protection. The in-sects lay their eggs under a bark scale, or on smooth bark gnawa little hole in which the Q<g^ is laid, and if access to the bark beprevented they seek other localities. The wire must be tied at Fig. The sinuate pear-borer, Agrilus sitiuatus.—a, beetle; b, larva; c, its anal fork; d,pupal chamber with pupa in position. the top to prevent beetles getting under it, and must extendunderground an inch or so. In this way we not only preventnew infestation, but any beetles that may emerge from the trunkwill be hopelessly imprisoned and will die without a chance toreproduce. Instead of wire netting, tarred paper or even newspaperstightly wrapped around the trunk to the branches will answeran excellent purpose, needing renewal each year, however, wherethe wire netting lasts several seasons. Thorough whitewashing THE INSECT WORLD. 189 offers a large measure of protection, since the adults will not vol-untarily eat through a coat of it, and the larvae cannot do so Fig. 174.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectinsectp, bookyear1906
