. Annual report of the Agricultural Experiment Station. Cornell University. Agricultural Experiment Station; Agriculture -- New York (State). 98 Agricultural Experiment Station, Ithaca, N. They are disc-like, very much flattened, usually oval in outline, a few are circular, and \^ measure .8 mm. by .7 mm. A flat outer rim .2 mm. wide adheres closely to the leaf, leaving a central slightly elevated rounded disc in which the larva develoj^s. About nine days after the eggs are laid the developing greenish caterpillar Fig. 37.—Egg of bud moth 1 . ?, -? • .i . ^ : > i showing the developing
. Annual report of the Agricultural Experiment Station. Cornell University. Agricultural Experiment Station; Agriculture -- New York (State). 98 Agricultural Experiment Station, Ithaca, N. They are disc-like, very much flattened, usually oval in outline, a few are circular, and \^ measure .8 mm. by .7 mm. A flat outer rim .2 mm. wide adheres closely to the leaf, leaving a central slightly elevated rounded disc in which the larva develoj^s. About nine days after the eggs are laid the developing greenish caterpillar Fig. 37.—Egg of bud moth 1 . ?, -? • .i . ^ : > i showing the developing lying curled up in the central portion can be caterpillar within— , in mi greatly enlarged. plainly secii tlirough the shell. The egg-stage lasts from seven to ten days. Summer habits of the eaterpillar.—Soon after emerging through a hole near the edge of the central portion of the egg-shell, the little greenish caterpillar begins to feed upon the skin of the leaf, usually upon the underside. A few hours later it makes for itself a tube of silk open at both ends and usually made alongside the mid-rib. From these silken homes the caterpillars sally forth to feed upon the surrounding tissues, protecting themselves as they go by a thin layer of silk spun over their feeding grounds (Fig. 38). They feed upon one epidermis and the inner tis- sues of the leaf, leaving the net-work of veinlets; the opposite epidermis forms the floor of its feeding grounds. The veinlets and the epider- mis soon turn brown, thus showing the work of a young caterpillar 1 • ii _„ ,.„U during the summer. rendering the summer work ^ of the insect quite conspicuous. Rarely more than one caterpillar works on a leaf. The caterpillars continue to feed in this manner during July and August, and a part of September. Soon after the third or fourth moulting of the skin, they cease feeding and seem to know in- stinctively that they have reached that point in their develop- ment when it is neces
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