. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. 39 sonietimos done \)y t»()th the o-ruhiuul the beetle. Tlie o;i'ul)s, to reiieh the adult condition, puss through a complete change or metamorphosis, like caterpillars, but do not spin a silken cocoon. The grubs do not have the prolegs that iivv found in caterpillars. The forms to be noticed below may be arranged as follows: 1. Boring in the twign Apple twig-borer. Boring in the trunk or larger 1 )ranfiies 2. 2. Making tiny circular holes in the hark Fruit-tree bark-beetle. Making a sinuate crack or depression S
. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. 39 sonietimos done \)y t»()th the o-ruhiuul the beetle. Tlie o;i'ul)s, to reiieh the adult condition, puss through a complete change or metamorphosis, like caterpillars, but do not spin a silken cocoon. The grubs do not have the prolegs that iivv found in caterpillars. The forms to be noticed below may be arranged as follows: 1. Boring in the twign Apple twig-borer. Boring in the trunk or larger 1 )ranfiies 2. 2. Making tiny circular holes in the hark Fruit-tree bark-beetle. Making a sinuate crack or depression Sinuate pear Viorer. piscolored spots on the bark Round-ht-ad and flat-head apple-tree borers. THK ROUND-HEADED APPLE-TREE KORER. {Sapcrddciindida Fab.—fig. 36.) Discolored places on the bark near the base of the trunk may indi- cate the presence of this borer. Sometimes the bark cracks over the burrow and allows the frassor "sawdust" to drop out, and often there. Fig. ZG.—Snpcrihi rnnilida: <i. h. larva: <\ beetle: d, pupa, eiilargerl. (Cliittendeii.) is some exudation of sap. Every unnatural-looking spot near the base of the tree should be examined. The adult of this borer is a grayish, long-horned beetle with two white stripes along its ])ack. They appear in June and July, and lay their eggs in little slits in the bark made by the beetle near the base of the trunk. The larva? or grul)s soon hatch and ))ore beneath the })ark, feeding on the sapwood and inner bark, and making Hat, shallow cavities, partially tilkxl with frass. The grubs are nearly cylindrical, pale yellowish in color, and when full- grown about an inch long. On the approach of winter they work downward, often below the surface of the ground. In .spring they begin to feed again, boring upward. In this manner they feed all summer until cokl weather, when the}'again hibernate. In the spring they resume work, l)ut now they l)ore more irregularly and further into the tree. In earlv fall they bor
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