INJURIOUS AXD BENEFICIAL INSECTS OP CALIFORNIA. 



155 



season's brood are brought forth. There is but one uneven brood a 

 year. 



Nature of Work.— All forms attack the tips of the pine twigs, often 

 congregating in large numbers. The young secrete much honey-dew 

 and the trees are often rendered black and unsightly because of 

 their presence. 



Fig. 133. — The Monterey pine scale, Physokermes insigni- 

 cola (Craw). Adult females near tip of pine twig. Enlarged 

 twice. Collected at Berkeley by Fred Essig. (Original) 



Distribution. — This species is common along the cost in the central 

 part of the State, being especially abundant in the San Francisco 

 Bay region. 



Food Plants. — The Monterey and other pines and white fir are 

 attacked. 



Control.— Spraying in the winter with kerosene or crude oil emul- 

 sion, or with miscible oil and soap sprays is recommended for the 

 control of this scale. A woodland nozzle is preferred to reach the 

 high branches. 



