. The American entomologist. Entomology. VOLlir-sll^ NEW YORK, AUGUST, 1880, No, PUBLISHED MONTHLY BY THE HUB PUBLISHING CO. of n. y. 828 Pearl St., Ne^v York. TERMS Two dollars per annum, in advance. EDITORS : CHAS. V. RILEY, Editor Washington, D. C. A. S. FULLER, Assistant Editor, Ridgewood, N. J. THE aRAPEVINE FLEA-BEETLE (Graptodera chalybea lUig.). Of the numerous insect enemies with which our grape-growers have to deal, the object of this sketch occupies an important place. The numerous complaints we have [Fig! m:. Grapevine Flea-Beetle -.—a, , with larvae natural size; ^, l
. The American entomologist. Entomology. VOLlir-sll^ NEW YORK, AUGUST, 1880, No, PUBLISHED MONTHLY BY THE HUB PUBLISHING CO. of n. y. 828 Pearl St., Ne^v York. TERMS Two dollars per annum, in advance. EDITORS : CHAS. V. RILEY, Editor Washington, D. C. A. S. FULLER, Assistant Editor, Ridgewood, N. J. THE aRAPEVINE FLEA-BEETLE (Graptodera chalybea lUig.). Of the numerous insect enemies with which our grape-growers have to deal, the object of this sketch occupies an important place. The numerous complaints we have [Fig! m:. Grapevine Flea-Beetle -.—a, , with larvae natural size; ^, larva, enlarged ; c, cocoon ; </, beetle, the swollen hind thighs not shown (after Riley). received this year of its ravages show that it has been more than usually abundant. The beetles which have hibernated begin their destructive work in the spring as soon as the buds commence to swell, and it is at this early period that the greatest damage is done by the beetles boring into and feeding on said buds. Later in the season the beetles feed upon the leaves, and upon these, in the month of May, the female lays her small orange-colored eggs in clusters. These soon hatch, and the young dark- colored larvae soon riddle the leaf, as shown in our figure (86), or when very numerous completely devour it, leaving only the largest ribs. In about a month the full-grown larvae (Fig. 86, d) descend into the ground, where each forms a small earthen cell, and changes to a dull yellowish pupa of the shape normally assumed in this family. The perfect beetle issues about three weeks later, from the middle of June to the middle of July, and again begins to eat the leaves, but the damage done to them is trifling compared with that done in early spring. So far as we have observed there is but one annual eneration, but it is probable that in the more Southern States there will be two. As soon as cold weather approaches the ! beetles retire under fallen leaves in the i ground, at the base of tree
Size: 1608px × 1554px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1860, booksubjectentomology, bookyear1
