ESSIG, NOTES ON COCCIDAE 13 



Not only is Black Scale found on the night-shade, but upon many other 

 plants in the gardens, and especially in the rocky waste places or "washes" 

 near many of the citrus groves. It is to the last condition which I wish to 

 refer and particularly to the Rhus or Sumac which grows abundantly in all of 

 these waste places. One need not examine closely to find Black Scale upon 

 this plant at great distances from the citrus groves and often in great abund- 

 ance. Sumac should not be allowed to grow near an orchard because it serves 



Figure 9. Saissetia oleae on roots of Solanum doug'lasii 



as constant breeding places for scale, and it is in one sense useless to fumigate 

 an orchard so surrounded without also fumigating or destroying the Sumac 

 growing near by. 



Icerya purchasi 



COTTONY CUSHION SCALE^ FLUTED SCALE, WHITE SCALE. 



In regard to this scale, attention should be called to the peculiar way in 

 which it secretes honey-dew. 



Upon a young orange tree in the laborator\- thousands of the young were 



