lss 



INJURIOUS AND BENEFICIAL INSECTS OF CALIFORNIA. 



been practically exterminated where two of these dosages were used 

 in succession at an interval of one hour and repeated in a year. The 

 time usually chosen for fumigation is from the middle of August to 

 the first of January, when the black scale can be killed also. 



Natural Enemies.— The ladybird beetles, Orcus chalybeus, Scymnus 

 nnirginicollis, Lindorus lopanthus; the larvae of the green lacewing, 

 Chrysopa calif arnica Coq., and brown lacewing, Sympherobius angustus 

 Bks., and the internal parasite, Aspidiotiphagus citrinus Craw, prey 

 upon this pest, though they are of slight value in checking its ravages. 



GLOVER'S SCALE 



Lepidosaphes gloverii (Packard) 

 {Coccus gloverii Packard) 



(Fig. 164) 



Description. — The scales of this species greatly resemble those of 

 the purple scale, but are lighter in color, very much narrower and 

 not so curved. The female scales 

 are about ■& inch long and the 

 males about one half as long. The 

 color varies from light to dark 

 brown. The eggs are slightly 

 oblong, very small and pearly 

 white. 



Life History.— The life history 

 is practically the same as for the 

 purple scale, but this species is not 

 nearly so prolific or destructive in 

 California. 



Nature of Work.— Glover's scale 

 infests all parts of the host plant, 

 causing discoloration of the foliage, 

 but in this State it has not yet 

 proven to be an orchard pest. 



Distribution.— This scale occurs 

 only in the most southern coast 

 counties. The writer has received 

 it from San Diego and Orange 

 (-(unities. 



Food Plants. — Citron, grape- 

 fruit, lemon. Magnolia fuscata, 

 orange and palms are attacked. 



Control. — Control methods are the same as for the purple scale. 



Fig. 164. — -Glover's scale, Lepidosaphes 

 gloverii (Pack.), on orange leaf. Slightly 

 enlarged. (Original) 



THE OYSTER-SHELL SCALE 



Lepidosaphes ulmi (Linnaeus) 

 (Coccus ulmi Linnaeus) 



( Fig. 165) 



Description. — The female scales appear like miniature oyster shells 

 from whence the species gets the common name. They vary from light 

 to very dark brown, the young and overwintering forms being often 



