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P
L U M
SAWFLY
(Hoplocampa flava)
DESCRIPTION
The pupae of Plum Sawfly over-winter in the soil, and they awaken as the
weather improves in Spring.
The Plum Sawfly lays its eggs on the flowers. The young maggots which develop
tunnel their way into the developing fruit. The only signs at this stage
are the tiny holes left by the maggots.
As
the maggots feed on the fruit, often a gooey black liquid exudes from the holes.
The
variety 'Czar' is one of the worst affected.
TREATMENT
Break the pest's lifecycle at two points. First, in late winter and
early Spring, gently loosen and turn the soil around the base of the tree
with a trowel or hoe. This will expose the over-wintering pupae to birds
who love to eat them.
The
second action is to spray the tree with derris (available at most garden
centres) as soon as possible when roughly half the flower petals have fallen.
If
the above action is taken, next year it should not be necessary to spray again.
GO TO
THE GARDEN PEST AND DISEASE MAIN PAGE FOR
PESTS AND DISEASES CLASSIFIED BY PLANT
Copyright 2000-08 David Marks. All rights reserved.
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