INJURIOUS AND BENEFICIAL INSECTS OF CALIFORNIA. 



121 



as soon as hatched. They collect in great numbers and secrete large 

 quantities of honey-clew, furnishing ample food for the black smut 

 fungus. There is but one brood a year. 



Fig. 102. — -The araucaria Eriococcus, Eriococcus araucarias 

 Mask., on Norfolk Island pine. Enlarged twice. ■ (Original) 



Distribution.— This pest was imported into this State and has be- 

 come generally distributed throughout all parts. 



Food Plants.— The Norfolk Island pine, Araucaria excelsa and A. 

 bidivillii are the common food plants. 



THE OAK ERIOCOCCUS 75 



Eriococcus quercus (Comstock) 



(Rhizococcus quercus Comstock) 



(Fig. 103) 



Description. — The body of the female is dark wine-colored or 

 purplish and is enveloped. in an oval, white felt-like sac £ inch long. 

 Fig. 103 shows the general appearance of the sacs very well. 



"The greasewood Eriococcus, E. adenostomcs Ehrh.. which is common on greasewood 

 throughout the State, greatly resembles the oak Eriococcus in size, color and shape. 



