INSECT ENEMIES OF WESTERN FORESTS 



113 



about 2 weeks the small tan moths emerge, fly, and lay their eggs 

 in the crevices between the leaf scales. Two related species, A. 

 trifasciae Braun (fig. 49) and A. franciscella Busck, are often 



Figure 49. — The cypress moth (Argyresthia trifasciae) : A, Adult and 

 cocoons on twig; B, eggs in scale crevices; C, larva; D, pupa; E, adult. 

 All greatly enlarged. 



associated with the cypress tip moth and cause similar damage. 

 The incense cedar tip moths {Argyresthia libocedrella Busck and 

 A. arceuthobiella Busck) and attack the twigs and leaflets of 

 incense cedar in Oregon. 



The cypress webber (Epinotia subviridis Hein.) (fig. 50) in the 

 caterpillar stage burrows through cypress leaflets, leaving a webby 

 trail, and then ties bits of gnawed twigs and leaves together to 

 form a small nest. Its work causes the foliage of cypress to turn 

 brown early in the spring. It is distributed from southern Cali- 

 fornia north into Oregon and Washington and is often found 

 working with the cypress tip moth. 



The cypress leaf miner (Recurvaria stanfordia Keif.) in the 

 caterpillar stage mines the twiglets of Monterey cypress at Palo 

 Alto, Calif., and R. juniperella Kearf. mines the twiglets and foli- 

 age of Sierra juniper. 



LEAF MINERS 



The leaves of many broadleaved trees are attacked by the larvae 

 of many leaf -eating insects, which bore within and feed internally 



