INSECTS OF CONIFERS ( LARCH ). 



83 



Argyresthialaevigatella H. S. 



(Larch Shoot Moth. Hyponomeutid* ; Lepidoptera.) 



Host: Larch (Larix europsea). 



Injury: Very injurious to young shoots. 



Description and biology: Larva 6-7 mm. long, bright yellow, with black head, feeds 

 under the ' ark of young larch shoots. After hibernating the larva is somewhat 

 reddish with dark 

 lines. Eggs laid singly 

 at leases of needles. 



Distribution: Europe. 



SoRAUER, P. Hand- 

 buch der Pflanzen- 

 krankheiten, 3d ed.. 

 1913, vol. 3, p. 269. 



Dendrolinius sibiriciis 



Tschetwerikoflf. 



(Larch Spinner. Lasi- 

 ocampidse; Lepidop- 

 tera.) 



Host: Larch. 



Injury: Considera- 

 ble. 



Description: Similar 

 to D. pini L. 



Distribution: Ural. 



TSCHETWERIKOPF. 



Rev. Russ. Ent., vol. 

 8, 1908, pp. 1-7. 3 



Laspeyresia zebeana liat- 

 zeburg (Grapholitha). 



(Larch Gall Moth. Tor- 

 tricidse ; Lepidop- 

 tera.) 



Host: Larch [Lari:c 

 europsea) . 



Injury: Forms galls 

 on twigs, giving ad- 

 mission to disease or 

 causing deformity. 

 Lia' le to introduction 

 in nursery stock during 

 the winter. 



Description and biology: Moth, wing expanse 17 mm., forewinga grayish black 

 with whitish transverse lines on the costal margin. Larva dirty yellow green with 

 brown thoracic shield, 10 mm. long. The larva attacks the twigs at the axils of 

 branches forming a' gall-like swelling. (See text fig. 45.) 



Distribution: Germany, 



Fig. 45.— Larch gall moth (Laspeyresia zebeana): Injury. (Barbey.) 



