Insect pests of farm, garden and orchard . shoots, 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 Lawrence.) for a few days, it usually revives and the giiilling forms a circular,gall-like swelling, though even blackberries are often shoots usually bi-anch from l^elow 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 bur
Insect pests of farm, garden and orchard . shoots, 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 Lawrence.) for a few days, it usually revives and the giiilling forms a circular,gall-like swelling, though even blackberries are often shoots usually bi-anch from l^elow 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 l)el()\v the giiillcd point unciburned. This may be done best late in Ma}- or in Jun(^ aftei- allthe eggs are laid. The Raspbe
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