. Insects injurious to fruits. Illustrated with four hundred and forty wood-cuts. Insect pests. 804 INSECTS INJURJOUS TO THE RASPBERRY. the interior, and gradually channels the cane to the root, in which it spends the winter months, forming before spring cavities of considerable extent. As the spring opens, it works its way up again, usually through the interior of another cane, to a height of five or six inches, where the larva, in pre- paring for the exit of the future moth, eats the cane in one ])lace nearly through, leaving a mere film of skin unbroken. When full grown, it is about an inch
. Insects injurious to fruits. Illustrated with four hundred and forty wood-cuts. Insect pests. 804 INSECTS INJURJOUS TO THE RASPBERRY. the interior, and gradually channels the cane to the root, in which it spends the winter months, forming before spring cavities of considerable extent. As the spring opens, it works its way up again, usually through the interior of another cane, to a height of five or six inches, where the larva, in pre- paring for the exit of the future moth, eats the cane in one ])lace nearly through, leaving a mere film of skin unbroken. When full grown, it is about an inch long, of a pale-yellow color, with a dark-brown head, and a few shining dots on each segment of the body. Within the cane, and near tlie spot specially prepared by the larva, the change to a chrys- alis takes place, and when the time a})proaches for the nioth to escape, the chrysalis wriggles itself forward, and, pushing against the thin skin remaining on the cane, ruptures it, and, forcing its way through the opening, there awaits the escape of the moth, which usually takes' place within a few hours afterwards. Tlie injury thus done to the root is often followed by the death of the canes, a result sometimes incorrectly attributed to the severe cold of winter. Little can be done towards the destruction of this pest other than by laying bare the roots and cuttino^ out the infested portions. A parasitic insect is said to attack these root-borers, and probably destroys many of them. No. 175.—The Raspherry-root Gall-fly. Bhodites radicum Osten Sacken. This is a small gall-fly, which pro- duces a large browai gall on the roots, a good representation of which is given in Fig. 314. The swelling is composed of a yellow, pithy su-bstance, scattered throughout which are a number of cells, each enclosing a small white larva, the progeny of the Fig. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - colorati
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Keywords: ., bookcentury1800, bookdecade1880, bookpublisherphila, bookyear1883
