This seems to be the most
effectual method of dealing with them after they have once entered the
tree, but the orchardist should endeavor to prevent the insects from
entering the tree. For this purpose, various washes have been
recommended for applying to the tree, either for destroying the young
larvae before they enter the bark, or for preventing the beetles
depositing their eggs. It has been found that trees which have been
coated with alkaline washes are avoided by beetles when laying their
eggs. Prof. Saunders recommends that soft soap be reduced to the
consistency of a thick paint, by the addition of a strong solution of
washing soda in water, and be applied to the bark of the tree,
especially about the base or collar, and also extended upward to the
crotches where the main branches have their origin. It should be
applied in the evening of a warm day, so that it may dry and form a
coating not easily dissolved by the rain. This affords a protection
against all three kinds of borers. It should be applied early in June,
before the beetles begin to lay their eggs, and again in July, so as
to keep the tree well protected.
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