152 



INJURIOUS \XD BENEFICIAL INSECTS OF CALIFORNIA. 



Lemon, oleander, orange, orchids, palm, peach, rose, sago palm, pepper 

 tree and Zamia are attacked. 



Control. — Control methods are the same as for black scale (Saissetia 

 oleat). This species rarely requires treatment except in greenhouses. 



Pig. 13<>. — The hemispherical scale, Saissetia hemi- 

 spharica (Targ.). Mature females on the underside of 

 an orange leaf. Enlarged twice. Collected at Ventura 

 l>y S. II. Essig. (Original) 



Natural Enemies. — The black ladybird beetle, Rhizohius ventralis, 

 the egg parasite. Scutellista eyanea. and the internal parasites, Corny s 

 fa sea and Coccophagus lecanii, aid greatly in keeping down the num- 

 bers of this insect. 



