A manual of dangerous insects likely to be introduced in the United States through importations

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Identifier: manualofdangerou01unit (find matches)
Title: A manual of dangerous insects likely to be introduced in the United States through importations
Year: 1917 (1910s)
Authors: United States. Bureau of Entomology Pierce, W. Dwight (William Dwight), 1881-1967
Subjects: Insects, Injurious and beneficial
Publisher: Washington, Govt. print. off.
Contributing Library: The Library of Congress
Digitizing Sponsor: Sloan Foundation

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Text Appearing Before Image:
NSECTS OF CONIFERS (LARCH), 83 Ar^resthia leevlgatella H. S. (Larch Shoot Moth. Hyponomeutidse; Lepidoptera.) Host: Larch (Lanx europsea). Injury: Very injurious to young shoots. Description and biology: Larva 6-7 mm. long, bright yellow, with black head, feedsunder the bark of young larch shoots. After hibernating the larva is somewhat reddish with dark lines. Eggs laid singlyat 1 ases of needles. Distribution: Europe. SoRAUER, P. Hand-1 uch der Pflanzen-krankheiten, 3d ed.,1913, vol. 3, p. 269. Dendrolinius slblricus Tschetwerikoff. (Larch Spinner. Lasi-ocampidse; Lepidop-tera.) Host: Larch. Inj u r y: Considera-1 le. Desaiption: Similarto D. pint L. Distribution: LTral. Tschetwerikoff.Rev. Russ. Ent., vol.8, 1908, pp. 1-7, 3figs. Laspeyresia zebeana Rat-zeburg (Grapholitha). (Larch Gall Moth. Tor-tricidse; Lepidop-tera.) Host: Larch (Larixeuropsea). Injury: Forms gallson twigs, giving ad-mission to disease orcausing deformity.Lia le to introductionin nursery stock duringthe winter.
Text Appearing After Image:
Fig. 45.—Larch gall iiiuUi yljisiiujnxhi zibcana): Injury, (liarl)ey.) Description and biology: Moth, wing expanse 17 mm., forewiugs grayish blackwith whitish transverse lines on the costal margin. Larva dirty yellow green withbrown thoracic shield, 10 mm. long. The larva attacks the twigs at the axils of1 ranches forming a gall-like swelling. (See text fig. 45.) Distribution: Germany. 84 A MANUAL OF DANGEROUS INSjfiCTS. SoRAUER, P. Hand^uch der Pflanzenkrankheiten, 3d ed., 1913, vol. 3, p. 282. NiJssLiN, Otto. Leitfaden der Forstinsektenkunde, 2d ed., pp. 422-424, figs, 356, 357. Dasyneura laricis F. Lw. (Larch Bud Gall Midge. Itonididse (Cecidomyidie): Diptera.) Host: Larch. Injury: Attacks liuds, forming galls. Description and biology: Eggs laid at base of needle clusters. The larvae enterthe dormant buds forming a gall-like swelling, and overwinter as very small larvae.They develop in the l)uds through the year. Pupate in cocoon in autumn. Theattacked Inids die. Distribution: Eu

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