There is more loss from this trouble than from the attacks of insects. See "Varieties" in a previous chapter, also "Gum." No wash will stop the evil. I think that it is less marked when the roots are undisturbed under a pavement than it is in cultivated borders. Apricot growers ought to remember that this fruit greatly resents root disturbance.
The small greenish yellow caterpillar of this moth, appearing in the spring, causes the leaves to curl.
(1) The only real remedy then is hand work, which in the case of extensive cultures is costly. (2) Where the trouble has existed in previous seasons spray with Paris Green, No. 3.
I have had much trouble with this pest, which is also common on the Pear. The blackish blobs, thickened at one end, are frequently abundant in summer. (1) Where a few wall trees are concerned not much damage need be done, as during the morning walk round the garden the slugs may be crushed between bits of flat wood carried in each hand. (2) In the case of larger trees two or three dustings of lime, repeated at intervals of a few days, are effectual.
The brown, yellow striped looper caterpillar of this moth appears in spring, attacking the foliage and young fruit. (1) Smear a hayband with tar and twist round the base (not on the trunk) of the tree. (2) Occasionally shake the trees. (3) In bad infestations spray with Paris Green, No. 3.