. Manual of fruit insects. Fig. 302. — Eggs of the imported currant worm. one fourth inch inlength, and has thedorsal aspect of theabdomen black ex-cept at tip. Assoon as the leaveshave expanded thefemale deposits herwhitish, smooth,elongate eggs end toend in rows alongthe principal veinson the underside ofthe leaves of the food-plant (Fig. 302).The eggs increase in size considerably after deposition, and measure about 2V i^^ch in length when ready to hatch. They hatch in a week or ten days, and the small whitish larvae begin their destructive work by eating small holes through the leaves (Fig
. Manual of fruit insects. Fig. 302. — Eggs of the imported currant worm. one fourth inch inlength, and has thedorsal aspect of theabdomen black ex-cept at tip. Assoon as the leaveshave expanded thefemale deposits herwhitish, smooth,elongate eggs end toend in rows alongthe principal veinson the underside ofthe leaves of the food-plant (Fig. 302).The eggs increase in size considerably after deposition, and measure about 2V i^^ch in length when ready to hatch. They hatch in a week or ten days, and the small whitish larvae begin their destructive work by eating small holes through the leaves (Fig. 303). As they increase in size the color changes to green, and after the first molt the body becomes covered with many black spots and the head is black. While small the larvae feed in col-onies, 30 or 40 on a leaf, which is soon consumed; they then scatter. Fig. 303. — Newly hatched currant worms feeding. CURRANT AND QOOSEBERRY INSECTS 343 to other parts of the plant. With increase in size they becomemore destructive, and if numerous are able to strip a bush ofits leaves in a few days (Fig. 304). The larvae molt severaltimes as they increase in size, but the exact number of moltshas not been determined. They become full-grown in two orthree weeks, and are then about f inch in length. At thelast molt theylose their blackspots and assumea uniform greencolor tinged withyellow at theends. The larvathen descends tothe ground andspins a smoothoval brownish co-coon beneathleaves or othertrash; sometimesthe cocoons areattached to thestems or leaves some distance from the grourid. The larvatransforms to a brownish pupa within the cocoon and the fliesof the second brood emerge in late June or early July. Some-times there is a small third brood. The winter is passed inthe cocoon, probably in the larval condition. Treatment. The larvae may be read
Size: 1743px × 1434px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectbenefic, bookyear1915
