THE MONTHLY BULLETIN. 



175 



THE ORANGE TORTRIX. 



Tortrix citrana Fern. (Family Tortncidse). 

 (Figs. 159, 160.) 



General Appearance.— The adult insects are gray in color and hardly 



,^^' 



Fig. 159. — The larva of the orange tortrix (Tortrix citrana Fern.) 

 emerging from a burrow in an orange. Other burrows are also visi- 

 ble. (Original.) 



one half inch long. The eggs are cream-colored, circular, flat and cov- 

 ered with fine mosaic-like mark- 

 ings. They are laid so as to over- 

 lap like the scales of a fish. The 

 larvffi when full grown vary 

 from one half to three quarters 

 of an inch in length and are 

 white or dusky in color. The 

 chrysalids are brown. 



Life History. — The eggs are 

 laid in clusters in early spring, 

 usually upon the undersides of 

 the leaves, each moth depositing 

 about fifty. The larvae hatch 

 in about two weeks and feed 

 upon the surface of the orange 

 fruit or upon the foliage or 

 tips of the shoots of the other 

 hosts. Burrows are also made 

 in the fruit, especially through- 

 out the peel, thus causing decay 

 and ruin. The voung reach maturity in about two months. The 



Fig. 16U. — The adult of tlie orange 

 tortrix (Tortrix citrana Fern.) near 

 entrance of larval burrow. (After 

 Quayle. Courtesy Cal. Exp. Sta.) 



