. The American entomologist. Entomology. THE AMERICAN ENTOMOLOGIST. 63 mediately dropped into bags and in them carried to the place where they are to be burned, and there emptied into the fire. If every one having blackberry bushes in their gardens would practice this method of destruction, this pest would soon cease to do much harm. Several species of Borers infest the Blackberry : the most common one is the larva of a small, slender, red-necked beetle, the Obereaperspicillata of Haldeman. The small, legless grubs bore the pith of the canes, causing them to die prematurely, or so weakening th
. The American entomologist. Entomology. THE AMERICAN ENTOMOLOGIST. 63 mediately dropped into bags and in them carried to the place where they are to be burned, and there emptied into the fire. If every one having blackberry bushes in their gardens would practice this method of destruction, this pest would soon cease to do much harm. Several species of Borers infest the Blackberry : the most common one is the larva of a small, slender, red-necked beetle, the Obereaperspicillata of Haldeman. The small, legless grubs bore the pith of the canes, causing them to die prematurely, or so weakening them that they are broken [Fig. 18.]. DiASTROPHOS NEUULOSUS; a, gall ; b^ slice of same showing cells and grubs nat. size ; c, larva ; rf, pupa—enlarged (after Riley). down with the wind. As there are some fourteen or fifteen species of the Oberea now known, it may be that more than one species breed in the Blackberry. Thus far however I am not a\yare that they have been very injurious, but it would be well to gather all infested canes and burn them with their contents. The Blackberry is subject to the attacks of several species of gall-insects. A fuzzy, prickly gall on the twigs is produced by a four-winged fly {Diastrophus cusa/tce/or- mis O. S). Another species of the same ge- nus [Diastrophus nebulosus O. S.) produces a large pithy gall on the canes, but both of these gall-makers have very formidable par- asitic enemies which keep them in check. There are also a few leaf-eating beetles, slugs and caterpillars, that sometimes attack the Blackberry, but they are seldom sufficiently numerous or injurious tp attract much at- tention. The larger species are readily destroyed by hand-gathering, and the smaller ones can usually be driven off by dusting the plants with lime. The most formidable enemy however of both the Blackberry and Raspberry is what is called the Orange-rust ( Uredo rubo- runi). It is perhaps more abundant on the Black-cap raspberry [Rubiis occidentalis) than on
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