This is the raspberry horn-tail, or the cane-borer. The adults are
wasp-like insects about a half-inch long and very active. They come out
of the canes in spring and the females soon lay eggs in the tender tips
of the young shoots. These eggs soon hatch and the larvae eat their way
up toward the tip, which causes it to wither and die. It is this injury
that causes much notice. As the tip dies, the larvae turn and go down
into the canes, as in the sample sent, also injuring them greatly,
though possibly not killing them for some time. The only way to attack
them is to pinch the spots where the eggs were laid; then those that
escape and cause the tips to wilt should be destroyed by cutting off the
tips below the point of injury or cutting off the canes when they show
damage. Likewise, the insects work on the wild rose, and cutting all
those out around a place will prevent enough adults from developing to
permit little damage to be done, always provided the berries are well
looked after.
Control of Red Spider.
Can you give directions for the prevention of injury by the red spider
to almond and other trees in the Sacramento volley?
The red spider on almond and prune trees is usually controlled by the
thorough application of dry sulphur to the foliage. On almonds the first
sulphuring should be done as soon as the leaves appear in March. A
second application is advised from the 1st to the 10th of May.
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