. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. THE PEACH AND PLUM SLUG. 95 the cavity thus formed the egg is placed. (See fig. 24, a.) The probabihty that this is the method of oviposition is supported by the fact that the adult was never observed on the underside of the leaf, but always on the upper side. Moreover, the pear slug, which is closely related to this species, performs the same operation from the underside of the leaf, depositing the &gg just beneath the upper epidermis. Morgan Goc. cit.) mistook the portion of the lower epidermis, which forms
. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. THE PEACH AND PLUM SLUG. 95 the cavity thus formed the egg is placed. (See fig. 24, a.) The probabihty that this is the method of oviposition is supported by the fact that the adult was never observed on the underside of the leaf, but always on the upper side. Moreover, the pear slug, which is closely related to this species, performs the same operation from the underside of the leaf, depositing the &gg just beneath the upper epidermis. Morgan Goc. cit.) mistook the portion of the lower epidermis, which forms the floor of the nidus, for a "mucilaginous secretion wliich extends beyond the real egg and produces a much larger surface for ; That this idea was erroneous can be easily seen by dissecting the Fig. 24.—Developmental stages of peach and plum slug: a. Egg in situ; b, newly hatched larva; c; larva nearly full grown; d, larva after last molt, ready to enter ground for pupation; e, prepupa;/, pupa; f^, adult. All much enlarged. (Original.) In selecting a leaf for oviposition the female usually chooses one some distance back from the terminal bud but one wliich is still tender. The fresh termmal leaves and the oldest tough ones seem to be avoided, although rather tough leaves are preferred to the newest growth. The number of eggs in a single leaf may vary from 1 to 25. It seems likely that a female, after selecting a suitable leaf, may deposit many eggs in it. This conclusion is strengthened by the fact that on April 9, within 9 days of the first appearance of the adults, and when infested leaves were very scattered, one leaf was found which contained 25 eggs. In some leaves the location of each egg is indicated on the upper side by a small, reddish-purple Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfect
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