Quassia
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Quassia has the advantage of not killing
ladybirds which are eating your aphides, the advantage of cheapness,
and the advantage of sparing bees when it is sprayed against apple
sawfly or raspberry beetle caterpillars at blossom time.
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It consists of chips of wood of Picrasma
quassioides which keep dry for years in a tin, and can only be ordered
through a good chemist, because although it is still used by District
Nurses to get rid of lice in children's hair, it is rarely used by
gardeners.
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Boil four ounces in a gallon of water for
half an hour, pour off the yellow liquid when cool and dilute with
three parts of water for an all-round garden spray against aphides and
small caterpillars.
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Quassia tastes very bitter and should not
be used on leaf crops that are going to be eaten within a fortnight.
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