Apple-leaf Aphis

I am sending herewith a small piece from one of my young apple trees. If

you can, will you kindly tell me what the insects are an it, and what I

had better do for them?

The apple twig which you send is infested with the eggs of the leaf

aphis or leaf louse. 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.

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