. Manual of fruit insects. temberdo not, as a rule, hatch. On hatching the young grub drops to the ground and, takingadvantage of any crack or crevice in the soil, soon burrows downto the roots of thevine. Here it feedsfor the rest of theseason on the finerroots, and whenthese are consumedattacks the largerroots and the un-derground part ofthe stem, eating outburrows and pits iinthe bark, as shownin Figure 389. A few of thegrubs complete their growth (Fig. 386) the same season,but the majority are only about three fourths grown at thetime for going into hibernation in October and November.Towa
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. Manual of fruit insects. temberdo not, as a rule, hatch. On hatching the young grub drops to the ground and, takingadvantage of any crack or crevice in the soil, soon burrows downto the roots of thevine. Here it feedsfor the rest of theseason on the finerroots, and whenthese are consumedattacks the largerroots and the un-derground part ofthe stem, eating outburrows and pits iinthe bark, as shownin Figure 389. A few of thegrubs complete their growth (Fig. 386) the same season, but the majority are only about three fourths grown at thetime for going into hibernation in October and November.Towards the last of May and in June the grubs ascend to withintwo or three inches of the surface and there construct earthencells within which about three weeks later they transform towhitish or pinkish-white pupa) (Figs. 387 and 388). On anaverage, 17 days are spent in this stage. After transformationthe beetles remain in the pupal cell for several days, in order tobecome hardened, and then burrow to the surface, emerging to-. FiG. 388. — Grape root-worm pupa in its earthen cell. 448 FRUIT INSECTS