Economic entomology for the farmer Economic entomology for the farmer and the fruit grower, and for use as a text-book in agricultural schools and colleges; economicentomol00smit Year: 1906 THE IXSECT WORLD. 319 terminal leaves soon after growth has started, and eating out the heart. It would seem thus as if considerable injury might be caused, but really this is not so, because in most cases they do not attack the shoots until the buds have become freed,—that is to say, the shoots are attacked above the flower cluster, so that no injury is done to the resulting crop. When the insects disappe
Economic entomology for the farmer Economic entomology for the farmer and the fruit grower, and for use as a text-book in agricultural schools and colleges; economicentomol00smit Year: 1906 THE IXSECT WORLD. 319 terminal leaves soon after growth has started, and eating out the heart. It would seem thus as if considerable injury might be caused, but really this is not so, because in most cases they do not attack the shoots until the buds have become freed,—that is to say, the shoots are attacked above the flower cluster, so that no injury is done to the resulting crop. When the insects disappear, which they do quite early, the shoot simply sends out a new spur from the last leaf, and the effect of their presence is scarcely noticed. Practically, there is no method of checking their increase, except by picking off the infested tips or crushing the caterpillars within the webbed leaves. We have another scries of families grouped under the Tortri- cids, sometimes called 'bell-moths,' from their peculiar appear- ance when at rest, but more commonly ' leaf-rollers,' from the quite usual larval habit of folding or rolling up the edges of leaves. We have a number of troublesome insects in this series, and some of them are not easy to deal with. The moths are quite easily recognized by their broad, short fore wings, forming a Fig. 367. Tcras minnta.—a, larva ; b, pupa ; moth ; (f, case made on apple-leaf. Fig. 368.
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