THE OLIVE INSECTS OF CALIFORNIA 



59 



the most important ones as well as a number of lesser importance 

 which are most often found in published economic literature, are in- 

 cluded so as to give some idea of the difficulties of growing olives in 



other districts, as well as to reflect 

 the benefit derived from excluding 

 these by state and national quaran- 

 tine. 



1. The olive thrips, Pkloeo- 

 thripsoleae (Costa) (fig. 14). This 

 insects attacks the leaves and fruit, 

 Fig. 12. Drawing of the pygidium of producing the characteristic scar- 

 the greedy scale, Aspidiotus camelliae r i n g common to the thrips. It OC- 



iaL) curs throughout Southern Europe, 

 Palestine, and South Africa and at times is a serious pest. 



2. The cicada, Tibicen cinctifer (Uhler). The egg punctures 

 weaken the small twigs and branches of young olive trees in the Salt 

 "River Vallov, Arizona. 10 



Fig. 13. Work of a caterpillar on the olive knot at Fairoaks. (Original.) 

 (Photo by Div. Sci. Illust., Univ. Calif.) 



loMorrill, Dr. A. W., 7th Ann. Kept. Com. Agric. and Hort., p. 34, 3915, 

 Cicada. 



