Insects injurious to fruits . escapes. This caterpillar sometimes prevails to such an extent asseriously to injure the foliage of apple-trees; in such casesthe most obvious remedy is to gather carefully in the autumnall the fallen leaves with the enclosed larvae and burn them. Fig. 97. No. 42.—The Apple-leaf Skeletonizer. Pempelia Hammondi insect occurs in the larval state in the autumn, andsometimes during the summer also, and is especially injuriousto young orchards and nurseries, giving the foliage a rusty, blighted appearance, caused bythe larva devouring the greenpulpy parts of
Insects injurious to fruits . escapes. This caterpillar sometimes prevails to such an extent asseriously to injure the foliage of apple-trees; in such casesthe most obvious remedy is to gather carefully in the autumnall the fallen leaves with the enclosed larvae and burn them. Fig. 97. No. 42.—The Apple-leaf Skeletonizer. Pempelia Hammondi insect occurs in the larval state in the autumn, andsometimes during the summer also, and is especially injuriousto young orchards and nurseries, giving the foliage a rusty, blighted appearance, caused bythe larva devouring the greenpulpy parts of the upper sur-face of the leaves and leavingthe closely-netted veins with theunder skin untouched. Thelarva (Fig. 97, a) is of a pale-brownish color, about half aninch long, with darker lines, asshown at h, where one of thesegments is highly magnified;sometimes the color assumes agreenish shade. Behind thehead there are four shiny-black tubercles, as shown at c inthe figure, also magnified. The larva covers the surface of. ATTACKING THE LEAVES. 101 the leaf with loose silky threads, attached to which will befound a number of small black grains of excrementitiousmatter, and under this rough covering the larva feeds. Itsometimes feeds singly and sometimes in groups; in thelatter case a number of the leaves are drawn together, andthe caterpillars live and feed within this shelter. The chrysalis is usually formed among the leaves in avery slight cocoon, and is about a quarter of an inch longand of a pale-brown color. The winter is passed in thechrysalis state, and the moths appear during May or Junefollowing. When its wings are spread, the moth measures nearly halfan inch across; it is of a deep purplish-gray color, with aglossy surface, and has two silvery-gray bands across thewings, as shown in the figure, at cZ, where it is magnified; thecross-lines below the figure indicate the natural size. Remedies.—This pest may be subdued by hand-picking ifbegun in good season. It is p
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Keywords: ., bookcentury1900, bookdecade1900, bookidin, booksubjectinsectpests
