. Manual of fruit insects. tly laid in peach leaveson trees adjoining infestedpear and cherry orchards,but the larvae do not seemto thrive on that foodplant. In the North the small,glossy black, four-wingedflies about ^ inch in lengthappear on the leaves aboutthe middle of May. Thefemale is provided with asharp saw-edged ovipositor Fig. 197. - Egg-blisters of the pear slug. j^y ^eans of which she de-posits her eggs under the epidermis of the leaf. The oviposi-tor is inserted from the under surface of the leaf and then somanipulated as to cut loose a portion of the upper epidermis,forming a kin
. Manual of fruit insects. tly laid in peach leaveson trees adjoining infestedpear and cherry orchards,but the larvae do not seemto thrive on that foodplant. In the North the small,glossy black, four-wingedflies about ^ inch in lengthappear on the leaves aboutthe middle of May. Thefemale is provided with asharp saw-edged ovipositor Fig. 197. - Egg-blisters of the pear slug. j^y ^eans of which she de-posits her eggs under the epidermis of the leaf. The oviposi-tor is inserted from the under surface of the leaf and then somanipulated as to cut loose a portion of the upper epidermis,forming a kind of blister inwhich the oval egg is laid(Figs. 197 and 198). Theegg hatches in about twoweeks and the whitish younglarva escapes on the upperside of the leaf through asemicircular cut in the over-lying epidermis. The larvaesoon become covered with abrownish sticky slime, whichis retained until they are full ^ .^^ ^^ ,,. , . ,, , •^ Fig. 198. •— Egg-blister of the pear slug, grown and gives them the greatly 216 FRUIT INSECTS appearance of small snails. The body is swollen in front andtapers behind like a tadpole (Figs. 199 and 200). The larva
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbenefic, bookyear1915
