[Fruit culture] . s illustrated in Fig. 37. Thecaterpillars become full grown, orabout I inch long, in about 3 weeks,when they pupate within the are usually two and some-times iour or five generations ayear. The caterpillars of the last broodpass the winter in the leaves, andbecause of this fact the mosteffective way to destroy the appleleaf miners is to collect and burnall apple leaves in the fall or toplow them under. 49. Apple-Tree Buccula-trix.—The larva, or caterpillar,of the tiny moth known as theapple-tree bucculatrix sometimesdoes considerable damage to apple trees by mining
[Fruit culture] . s illustrated in Fig. 37. Thecaterpillars become full grown, orabout I inch long, in about 3 weeks,when they pupate within the are usually two and some-times iour or five generations ayear. The caterpillars of the last broodpass the winter in the leaves, andbecause of this fact the mosteffective way to destroy the appleleaf miners is to collect and burnall apple leaves in the fall or toplow them under. 49. Apple-Tree Buccula-trix.—The larva, or caterpillar,of the tiny moth known as theapple-tree bucculatrix sometimesdoes considerable damage to apple trees by mining, or eating,practically all the tissue of the leaves except the upper sur-face. The caterpillars are scarcely ever more than I inch long,but when they occtu in large numbers the white cocoons, whichare about | inch long and in which the caterpillars pupate,almost cover the twigs. There are usually two broods a year;the caterpillars of the second brood remain on the tree allwinter in the little white cocoons. ?. Fig. 37 52 APPLE PESTS AND INJURIES § 6 Spraying the trees during the winter with a lime-sulphursolution of a specific gravity of will kill the hibernatingpupas, and the arsenate-of-lead spray recommended for thecodling moth will kill the caterpillars as they are eating theleaves. 50. Palmer Worm.—An insect that makes very irregularappearances in apple orchards is the palmer worm. Theseso-called worms, which, when full grown are about | inch long,are the caterpillars of smaU ashen colored moths. The cater-pillars vary in color from flesh to yellow, are tinted with green,and are sparsely covered with fine hairs. They appear in largenumbers and at long intervals; sometimes as many as 50 yearselapse between their appearances. They eat all the soft tissueof the leaves. When use is made of an arsenical spray as in combating thecodling moth, little damage to an apple orchard will follow theappearance of the palmer worms. 51. Brown Mite.—The presence of brown mites,
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Keywords: ., bookcentury1900, bookdecad, booksubjectfruitculture, bookyear1912
