. The American fruit culturist. es. If new plants must be takenfrom an infested field, use those which started after July anddig them early in the spring, to avoid carrying the eggs orlarvae of the insect with the plants. The plowing under ofthe infested field about July ist will destroy the insect. Thefrequent rotation of other crops with the strawberry patchusually prevents the ravages of this crown borer. 208 DESTRUCTIVE INSECTS. The Strawberry Leaf-roller {Fhoxopteris comptana) is inmany localities the most injurious insect pest of the straw-berry. A small greenish or brownish caterpillar
. The American fruit culturist. es. If new plants must be takenfrom an infested field, use those which started after July anddig them early in the spring, to avoid carrying the eggs orlarvae of the insect with the plants. The plowing under ofthe infested field about July ist will destroy the insect. Thefrequent rotation of other crops with the strawberry patchusually prevents the ravages of this crown borer. 208 DESTRUCTIVE INSECTS. The Strawberry Leaf-roller {Fhoxopteris comptana) is inmany localities the most injurious insect pest of the straw-berry. A small greenish or brownish caterpillar folds theleaflets of the strawberry by bringing the .upper surfaces to-gether and fastening them by silken cords (Fig. 276). In thisretreat the insect spends its whole larval life, feeding uponthe leaf, and ultimately causing it to turn brown and shrivelup. The transformation through the brown pupa to the adultinsect—a pretty little brown moth—takes place within thefolded leaf. There are two annual broods of the pest in the. Fig. 276.—Strawberry Leaves Folded b\- the Strawberry Leaf-roller. North, and at least three in Kentucky and southward. Thewinter is passed as a pupa in the rolled leaves. Spraying with poisonous mixtures is impracticable whilethere is fruit on the plants, and experiments indicate thatsuch applications are not very effectual at an}- time, so se-curely protected are the feeding-grounds of the caterpillars. However, it is claimed that the pest can be almost exter-minated in a field by mowing it after the crop is gathered, andafter leaving it a day or two to become dr3^ burn it over, per-haps with the aid of a little straw or rubbish. This can usuallybe done without the slightest injury to the plants. This willdestrov the leaf-roller as well as several other kinds of insects, DESTRUCTIVE INSECTS. 209 and also the spores of some serious fungous diseases. Onsmall areas it is practicable to crush by hand the insects inthe rolled leaves. The Strawberry Weevi
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