42 



MISC. PUBLICATION 273, U. S. DEPT. OF AGKICULTFllE 



L. popidana 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. 





i^ 





\\wF^ H\ ■•, ■' '-Iff* I'l 



Figure 18. — The cypress twig moth {Laspeyresia cupye><f<ana) and its work in Monterey 

 cypress : A, Adult. X 2.25 ; B, eggs, X 2; C, larva, X 3 ; D, pupa, X 3.75. (Draw- 

 ings by Edmonston. ) 



Cedae Tip Moths 



The cedar tip moths, a group of small moths bel6nging 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. '\^^ien 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 



