These eggs are very difficult to kill. A good
thorough spraying with lime-sulphur might, however, get rid of many of
them and would be good for the trees otherwise - diluting according to
condition of tree growth. The chief campaign against the leaf aphis,
however, must be made early in the growing season, just as these pests
are beginning to hatch out and to accumulate under the leaves of the new
growth. They should then be attacked with properly made kerosene
emulsion or tobacco extract with a nozzle suited to land the spray on
the under side of the leaves. Unless these pests are attacked early in
the season and repeated if necessary, your apples on bearing trees will
be ruined so far as they attack them, being small, misshaped and
worthless. On young trees the destruction of the foliage is fatal to
good growth.
Woolly Aphis.
Will you kindly inform me what you consider the best treatment for apple
trees affected by woolly aphis?
The best way to kill the woolly aphis on the roots is to remove the
earth from around the tree to a distance of one or two feet, according
to the size of the tree, digging away a few inches of the surface soil,
Then soak the soil around the tree with kerosene emulsion, properly
made, of 15 per cent strength, and replace the earth. Be sure you get a
good emulsion, for free oil is dangerous. For the insects above ground
on the twigs, a good spraying while the tree is out of leaf will kill
many, but some will survive for summer spraying, and for this a tobacco
spray may be most convenient.
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