442 



INJURIOUS AND BENEFICIAL INSECTS OF CALIFORNIA. 



Nature of Work. — The larva makes a clean, round burrow through 



the rind and sometimes into the pulp of 



Fig. 4 49. — The orange Tortrix, Tortrix citrana 

 Fernald. Larva and burrows in orange at top; 

 larval burrow and adult on orange at bottom. 

 ("Top, author's illustration, Mo. Bui. Cal. Hort. 

 Com.; bottom, after Quayle, Cal. Agrcl. Exp. Sta.) 



""Quayle, H. J., Jr. Ec. Ent. Ill, p. 402, 1910. 



the orange, causing it to 

 fall prematurely or decay. 

 Fruits which do not decay 

 immediately are mined for 

 market purposes because of 

 the burrows. The larvae 

 also sometimes roll the 

 leaves in which they live 

 and occasionally burrow 

 into the tips of the 

 branches. 



Distribution. — The moth 

 is a native species and is 

 quite widely distributed 

 throughout the State. It 

 has been injurious only in 

 the southern part. 



Food Plants.— The fol- 

 lowing plants are attacked : 

 acacia, apricot, asparagus, 

 Cineraria, Job 's tears, 

 eucalyptus, fern s, gera- 

 nium, golden rod, Jerusa- 

 lem cherry, Lantana, lav- 

 ender, oak, orange, Pentas, 

 rose, wandering Jew, wild 

 black walnut and willow. 314 



Control. — Though the 

 destructiveness to oranges 

 by this insect has been 

 quite great in a few in- 

 stances, yet not enough 

 actual damage has been 

 done to warrant the appli- 

 cation of poison sprays or 

 other methods necessary 

 for control. The parasitic 

 braconids which work upon 

 the larvae no doubt play 

 some part in the subjection 

 of the pest. 



Natural Enemies. — The 



t a c h i n a fly (Phoroccra 

 parva Bigot.) has been 

 reared from the orange 

 Tortrix at Los Angeles. 

 Internal braconid parasites 

 also work upon it. 



