Economic entomology for the farmer and the fruit grower, and for use as a text-book in agricultural schools and colleges; . economicentomol00smit Year: 1906 288 ^A' ECO NO All C ENTOMOLOGY. be made is constant watching by some man especially employed, who will destroy the borers just as soon as their presence is noticed, and who will gather the moths beneath the electric lights now found in most cities. Pans in which oil or some other sub- stance is kept to kill the insects falling into them, properly arranged just beneath the lights, will prove of considerable Fig. 321. The wood 'leopard-
Economic entomology for the farmer and the fruit grower, and for use as a text-book in agricultural schools and colleges; . economicentomol00smit Year: 1906 288 ^A' ECO NO All C ENTOMOLOGY. be made is constant watching by some man especially employed, who will destroy the borers just as soon as their presence is noticed, and who will gather the moths beneath the electric lights now found in most cities. Pans in which oil or some other sub- stance is kept to kill the insects falling into them, properly arranged just beneath the lights, will prove of considerable Fig. 321. The wood 'leopard-moth,' Zeiizera pyrina.—a, b, larva, from above and side, about half grown; c, male, rf, female; e, larval burrow, showing the tendency of the full- grown caterpillar to girdle its food plant. benefit; but it will take years of steady work to lessen the insects in some of our cities, and to remove them as a source of danger to the shade-trees. In the idimWy Noduidcs, or 'owlet-moths,' we have a large number of species, and among them many that are troublesome to the agriculturist. The moths are, as a rule, sombre gray or brown, expanding when the wings are spread between one and three inches, averaging perhaps an inch and a half in the majority of cases. The fore-wings are comparatively narrow, rather short
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