. Insect pests of farm, garden and orchard . girdle it, and usually eats a small hole throughthe bark at this point. The maggot continues to feed on thepith at this point so as to liearly sever the shoot, the tip of whichsoon wilts and droops, turning a deep blue color. On blackberryshoots, however, the bark is so thick that although the tip droops. Fig. 339.—Gall-like swelling on living blackberry canes caused by the rasp-berry cane-maggot. (After LawTence.) for a few days, it usually revives and the girdling forms a circular,gall-like swelling, though even blackberries are often
. Insect pests of farm, garden and orchard . girdle it, and usually eats a small hole throughthe bark at this point. The maggot continues to feed on thepith at this point so as to liearly sever the shoot, the tip of whichsoon wilts and droops, turning a deep blue color. On blackberryshoots, however, the bark is so thick that although the tip droops. Fig. 339.—Gall-like swelling on living blackberry canes caused by the rasp-berry cane-maggot. (After LawTence.) for a few days, it usually revives and the girdling forms a circular,gall-like swelling, though even blackberries are often shoots usually liranch from below the girdled point,making a bushy growth. Lawrence states that later in theseason lateral shoots are also attacked. He also observes thatmaggots never develop in living canes. The maggot continuesto burrow downward in the pith and becomes full grown in June,when it pupates at the lower end of the burrow. The pupariaare to be found in the lower part of the affected stalk in Juneand July, but the adult flies do not emerge until the next —As soon as the young tips are seen to droop they 472 INSECT PESTS OF FARM, GARDEN AND ORCHARD should be cut off several inches below the girdled point andburned. This may be done best late in May or in June after allthe eggs are laid. The Raspberry Saw-fl
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