82 



A MANUAL OF DANGEROUS INSECTS. 

 LEPIDOPTERA. 



Tortricidse. 



Tortrix histrionana Froelichs; Germany: attacks shoots. 

 Hyponoineutidse. 



Argyresthia illuminatella Zell.; Germany; attacks buds and young shoots. 



HYMENOPTERA. 

 Tenthredinidae. 



Lygxonematus pini Ratzeburg; the small spruce sawfly: Europe; defoliates and injures Duds and 



young shoots. 

 Lygxoncmalusambiguus'Failena.nd L. saiesenillaUig; Europe; defoliators. 



Sirlcidae. 



Sirex imperialis Kirby, the spruce wood wasp; India; bores in wood of Picea morinda Lind. 

 Sirex spectrum Linnaeus; Europe. (See text fig. 44.) 



I. BETTER KNOWN IMPORTANT PESTS OF LARCH (LARIX). 



Erlophyes laricis von Tubeuf. 



(Larch Blister Mite. Eriophyidse; Acarina.) 



Host: Larch [Larix decidua (europaea)]. 



Injury: Forms gall-like deformations of the termiual l)ud. 



Fig. 44. — Spruce wood wasp (Sirex spectrum): Adult attacking Picca. (Barbey). 



Description and biology: A four-legged blister mite which forms gall-like swellings of 

 the terminal or axilary buds. Very easy to introduce on nursery stock. 



Distribution: Europe. 

 VON Tubeuf. Forst. naturw. Zeitschr., 1897, Bd. 6, pp. 120-124, 3 figs. 



Coleophora laricella Hiibner. 

 (Larch Needle Miner. Elacliistidse; Lepidoptera.) 



Host: Larch [Larix decidua (europxa)]. 



Injury: Attacks early buds and mines the needles. The injury is great. Easily 

 introduced in nursery stock. 



Description and biology: Adult moth 3 mm. long, with wing expanse 9 mm., fore- 

 wing brownish gray, faintly sliining, wings fringed with long hairs. Larva dark 

 reddish brown, the little head, thoracic shield, and anal portion dark, 5 mm. long. 

 The larva mines needles and 1 uds. Pupates in a sack or case. 



Distribution: Europe. 



SoRAUER, P. Handbuch der Pfianzenkrankheiten, 3d ed., 1913, vol. 3, p. 253. 

 NiJssLiN, Otto. Leitfaden der Forstinsektenkunde, 2d ed., pp. 431-433, figs. 

 366, 367. 



