Control Of Red Spider
Categories: Pests and Diseases of PlantsCan 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. A third
appl
should be treated as soon as the spider appears. In the Sacramento
valley this usually occurs about the first week of July. Full-grown
trees require about a pound of sulphur which should be thoroughly
distributed throughout the foliage. The old method of throwing a handful
of sulphur in the branches of the tree or on the ground under the tree
is valueless. The use of a blower is economical in large orchards, but a
can with perforated bottom is frequently used on young trees or small
orchards with good results. In normal seasons the spider is easily,
controlled by dry sulphuring. When the pest does not yield to this
treatment, a spray is recommended.
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