510 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 4 



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SCALE INSECT PARASITISM IN CALIFORNIA 



By H. J. QuAYLE 



More activity has been manifested in the importation and propa- 

 gation of Coccid parasites in California than in any other place in 

 the world. The State Horticultural Commission has been active 

 in this work ever since the introduction of Novius cardinalis from 

 Australia in 1889. During this time much good work has been done 

 and several importations have been successfully established in the 

 State. In most of these cases of successful introductions it is assumed 

 that the Bureau of Entomology at Washington played an important 

 part, and usually has taken the initiative. This paper will not review 

 the history of this work, but will present a brief account of the present 

 status of scale parasitism in the State, which will include the native 

 species as well as the importations. 



SAN JOSE SCALE 



(Aspidiotus perniciosus Comst.) 



The statement is frequently made that the San Jose scale is no 

 longer a pest in California because of its parasitic enemy, Aphelinus 

 fuscipennis How. But this is based upon no studies whatever and 

 in most cases is merely an inference. While the writer has accumu- 

 lated no extensive data on the amount of this parasitism, what has 



