Economic entomology for the farmer and the fruit grower, and for use as a text-book in agricultural schools and colleges; . economicentomol00smit Year: 1906 238 ^jV economic entomology. These beetles dififer from all the other weevils in their cylin- drical form and very short snout, which is scarcely more than a slight prolongation of the head, and they are usually of small size, most of them not exceeding one-eighth of an inch in length. Fig. 245. Calandra granaria.—a, adult ; b, larva ; c, pupa ; d, C. oryza, adult. Scolytiis riigulosiis, the 'fruit-bark beetle,' is, perhaps, the best k
Economic entomology for the farmer and the fruit grower, and for use as a text-book in agricultural schools and colleges; . economicentomol00smit Year: 1906 238 ^jV economic entomology. These beetles dififer from all the other weevils in their cylin- drical form and very short snout, which is scarcely more than a slight prolongation of the head, and they are usually of small size, most of them not exceeding one-eighth of an inch in length. Fig. 245. Calandra granaria.—a, adult ; b, larva ; c, pupa ; d, C. oryza, adult. Scolytiis riigulosiis, the 'fruit-bark beetle,' is, perhaps, the best known, and certainly the most important economically, attacking deciduous fruit-trees of almost all kinds. The black parent beetles appear in early spring, and bore little round holes through the bark to the sap-wood. They then make a central burrow, on each side of which little notches are made to receive the soft white eggs. The larvae hatch very soon, and at once begin to make little burrows of their own, diverging as they move from the parent channel, and gradually enlarging them as they increase in size. When full grown they form a slightly enlarged chamber, in which they pupate, and when they trans- form to beetles, make their way out through little round holes in the bark. The whole period of development does not exceed a month, and there may be several broods during the summer from the same tree, the numerous galleries eventually girdling and killing it.
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