INJURIOUS AND BENEFICIAL INSECTS OF CALIFORNIA. 



123 



sions and tobacco decoction, or spraying infested plants repeatedly 

 with these, will give good results, if the work is thoroughly done. 



^tq ESSIG 



Fig. 104. — The California cochineal scale, Dactylopius confusus 

 (Ckll.), on Opuntia. Natural size. Collected in San Diego by 

 J. A. Prizer. (Original) 



Natural Enemies. — The natural enemies of this scale are quite 

 numerous and play a very important part in keeping it in subjection. 

 The following are recorded by Hunter, Pratt and Mitchell: 78 the 

 ladybird beetles, Chilocorus cacti Linn., Cycloneda mwnda Say, Exo- 

 chomus latiusculus Casey, Exochomus ma/rginipennis Lee, Hyperaspis 

 cruenta Lee, Hyperaspis trifurcata Schaeffer, Scymnus hornii Gorham, 

 Scymnus IcbwU Mulsant and the lepidopterous insects, Lceiilia coecidi- 

 vora Comst., Saluria ardiferella Hulst. and Zophodia dilatifasciella 

 Ragonot. 



THE MARLATT SCALE 



Phcetricococcus marlatti Cockerell 



(Fig. 105) 



Description. — The adult females are dark wine-colored and secrete 

 partially over and around themselves a white waxy material similar to 

 that made by the European elm scale. The bodies are oval in form and 



70 Bul. No. 113, Bur. Ent. U. S. Dept. Agric, p. 24, 1912. 



