. Economic entomology for the farmer and fruit-grower. Beneficial insects. i86 AN ECONOMIC ENTOMOLOGY. Fig. The flat-head apple-borer, Chrysobothris femorata. — a, larva; A, pupa ; rf, adult. wing-covers are nearly smooth or with fine punctulations only, and the larvae also feed principally in conifers. In the genus Chrysobothris we have forms that are quite flat- tened above, the wing-covers with irregular depressions and elevations, the prothorax with curved ^ides and narrower behind. Here be- long most of the troublesome species, including C. femorata, the '' flat-headed apple-borer,&
. Economic entomology for the farmer and fruit-grower. Beneficial insects. i86 AN ECONOMIC ENTOMOLOGY. Fig. The flat-head apple-borer, Chrysobothris femorata. — a, larva; A, pupa ; rf, adult. wing-covers are nearly smooth or with fine punctulations only, and the larvae also feed principally in conifers. In the genus Chrysobothris we have forms that are quite flat- tened above, the wing-covers with irregular depressions and elevations, the prothorax with curved ^ides and narrower behind. Here be- long most of the troublesome species, including C. femorata, the '' flat-headed apple-borer," which, despite its com- mon name, attacks a great variety of trees. The larva makes irregular chan- nels and chambers in the sap-wood, boring into the solid tissues a short dis- tance only, just before pupation, and this describes also the habits of many of the other species of this genus. The eggs are laid on the bark in June or July, and the larvae live from one to three years before coming to maturity. Pupation occurs shortly before the pe- riod at which the adults emerge. The genus Agrilus contains species differing from any of those heretofore mentioned by their slender, cylindrical form, the head squarely truncate, or cut off in front, the elytra much narrowed at tip. As a rule, the species are dull brownish-bronze in color, the prothorax sometimes brassy or red-bronzed, and none is better known than the '' red- necked blackberry-borer," Agrilus rufi- collis, the author of the "gouty gall" on that plant. The larvae in this genus are unusually long and flattened, the seg- ments strongly marked, the '' head'' not much wider than the body, and the anal forks distinct, differing in each species. Returning to the blackberry-borer, it is good practice to cut out all galled canes early in spring and burn them. Trimming is done at this time as a matter of regular cultivation, and the galls are then easily seen. No "galled" Fig. Please note t
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectbenefic, bookyear1906
