A? MISC. PUBLICATION 273, U. 8. DEPT. OF AGRICULTURE 
L: populana Busck breeds in the bark of Populus trichocarpa in 
Montana and Colorado. 
The cypress twig moth Laspeyresia cupressana Kearf. (fig. 18) is a 
small coppery-brown moth with a wing expanse of about five-eighths 
of an inch. The caterpillars, which are reddish green, bore into 
fresh green cones and into the bark of trunks and limbs of Mon- 
terey cypress in California. Usually the attack is made at the forks 
of branches or at points of injury. It causes an exudation of resin, 
and a deformation or the death of the affected part. In this work 
it probably plays a part secondary to that of a tree-killing bark 
disease, Coryneum. 
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Figure 18.—The cypress twig moth (Laspeyresia cupressana) and its work in Monterey 
cypress: A, Adult, x 2.25; B,-eggs, x 2; °C; larva, < -3:;"D; pupa; <-3.15.- (Draw: 
ings by Edmonston. ) 
CeDAR Tip MotTHs 
The cedar tip moths, a group of small moths belonging to the genus 
Argyresthia, while in the caterpillar stage mine in the twigs and 
leaflets of the various cedar and cypresslike trees, causing the foliage 
to turn brown. The damage is not serious except to the appearance 
of shade and ornamental trees. Most of the feeding is done early in 
the spring. When the caterpillars reach full growth they emerge 
from the twigs and spin white, feathery cocoons on the surface of 
the leaflets; and in about 2 weeks the small moths emerge, fly, and 
lay their eggs in the crevices between the leaf scales. An oil and 
nicotine spray applied early in the spring is recommended for the 
