Economic entomology for the farmer and fruit-grower : and for use as a text-book in agricultural schools and colleges . ended against thewhite-marked tussock mothcan be employed here as well,and trees once cleared can bekept free without much diffi-culty. When arbor-vitae is at-tacked, the picking should bethoroughly and carefully done, because these hedges suffer veryrapidly, and once defoliated, usually die. In orchards wherespraying is done against the codling-moth, the bag-wormsare destroyed incidentally and no special measures need be takenagainst them. Next follows the family of prominen
Economic entomology for the farmer and fruit-grower : and for use as a text-book in agricultural schools and colleges . ended against thewhite-marked tussock mothcan be employed here as well,and trees once cleared can bekept free without much diffi-culty. When arbor-vitae is at-tacked, the picking should bethoroughly and carefully done, because these hedges suffer veryrapidly, and once defoliated, usually die. In orchards wherespraying is done against the codling-moth, the bag-wormsare destroyed incidentally and no special measures need be takenagainst them. Next follows the family of prominents, so called from thefact that the moths frequently have a tooth at the inner marginof the fore wings, and the caterpillars are sometimes a littlehumped. They are technically termed NotodontidcE. Most ofthem have a small, retracted head, many of them a short orobsolete tongue, and some are more or less troublesome on cul-tivated plants. One of the best known is the yellow-necked caterpillaroften found feeding on apple-trees in colonies of from fifty tomore than one hundred. When full grown it is nearly two inches. The bag-worm.—a, sack of female cutopen to show the grub-like creature at itsmouth ; b, the female removed from thebag, much enlarged. 276 AuV ECONOMIC KXrOMOLOGY. in length, with a black head, a yellow neck, and the rest of thebody yellow and black spotted. It has a peculiar habit of hold-ing by the false legs only and dropping the head and anal seg-ments when at rest. The insects feed very rapidly and oftendefoliate large branches before their presence is realized. Whenfull grown they descend to the ground, burrow a short distancebeneath the surface, forming a conical pupa, and remain in thatcondition during the winter. In spring the moths emerge, andare of a brownish-yellow color, crossed by rather even, narrow, Fig. 300.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectinsectp, bookyear1906
