. Manual of fruit insects. Fig. 183. — Round-headed apple-tree borer pupa in its burrow. plugged. On smooth-barked trees a small, slightly sunken areaof dead bark often marks the end of this tunnel, and thusenables one to locate the borer from the outside before it trans-forms and emerges. A small chamber an inch or more inlength is left near the end of the tunnel where the grub hiber-nates practically secure from the entrance of enemies in eitherdirection. Doubtless some of the grubs do not make this finalpreparation for their further development into the adult insectuntil the third spring. E
. Manual of fruit insects. Fig. 183. — Round-headed apple-tree borer pupa in its burrow. plugged. On smooth-barked trees a small, slightly sunken areaof dead bark often marks the end of this tunnel, and thusenables one to locate the borer from the outside before it trans-forms and emerges. A small chamber an inch or more inlength is left near the end of the tunnel where the grub hiber-nates practically secure from the entrance of enemies in eitherdirection. Doubtless some of the grubs do not make this finalpreparation for their further development into the adult insectuntil the third spring. Early the third spring, often in May, 190 FRUIT INSECTS the grub or borer sheds its skin in this specially prepared chamberand appears in the pupal stage, a delicate, yellowish-white ob-ject, somewhat resembling the adult insect (Fig. 183). This pupa gradually growsdarker in color and inabout three weeks trans-forms to the beautifuladult or beetle whichsoon emerges from around hole (Fig. 184)about the size of a leadpencil
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbenefic, bookyear1915
