larvae of the saw-fly feed on the tender leaves in spring. Spray with Paris green or arsenate of lead, or apply hellebore.
The cane-borer is a grub that burrows down through the canes, causing them to die. In laying her eggs, the adult beetle girdles the tip of the cane with a ring of punctures, causing it to wither and droop. In midsummer, cut off and destroy the drooping tips.