170 



INJURIOUS AND BENEFICIAL INSECTS OF CALIFORNIA. 



THE ROSE SCALE 



Aulacaspis rosw (Bouch6) 93 



(Aspidiotus rosw Boucb.6) 



(Fig. 147) 



Description.— The female scales are nearly circular with irregular 

 edges, white to light gray and with yellow exuvias near one edge. The 

 diameter varies from T V to ^ inch. The bodies are 

 red. The male scales are white, narrow, very small, 

 tricarinated, and are one half as long as the diam- 

 eter of the females. The bodies are pink. 



Life History.— All stages of this scale occur prac- 

 tically throughout the entire year, including the 

 eggs, and its spread is very rapid. The females 

 cluster in great numbers upon the canes of berries 

 and roses, especially around the crown just above 

 the ground. It is more abundant during the spring 

 and summer months. There are three or more 

 broods a year. 



Nature of Work.— The scales collect in great 

 numbers upon the stems or canes, especially near 

 the ground. They often overlap and completely 

 hide these, so that they appear whitewashed. The 

 hosts are greatly weakened and injured by them. 



Distribution. — This is a very common species 

 throughout the entire State. 



Food Plants.— Blackberry (wild and cultivated), 

 dewberry, mango, myrtle, pear, raspberry, rose, 

 sago palm and Tree of Heaven are attacked. 



Control.— As the eggs are present at practically 

 all seasons and are hard to kill, by either spraying 

 or fumigation, the cost of the remedies usually 

 exceeds the damage done by the insect. The worst 

 infested canes may be cut out and burned and the 

 remaining sprayed successively with kerosene, dis- 

 tillate or carbolic acid emulsion, or with lime- 

 sulphur when the plants are dormant in the 

 winter. Fig 147 _ The rose 



Natural Enemies. — Two minute hymenopterous ?caie, f-uiacaspia rosw 



. <* r (Bouche), on wild 



parasites, Aplielmus maspidis and Arrhenophagus blackberry. Only 

 cliionaspidis, attack the rose scale. ^original) enlarged - 



THE ASPIDISTRA SCALE 



Hcmichionaspis aspidistrw (Signoret) 

 (Chionaspis aspidistrw Signoret) 



(Fig. 148) 



Description.— The female scales slightly resemble the oyster-shell 

 ■in shape, being rather long and broadly rounded at the posterior 



e5 Mr. Frederick Maskew has informed the writer that the West Indian or white 

 Aulacaspis pentagona (Targ.), was found in a single locality in southern 

 Calif orn ia many years ago, but the infested trees were destroyed and the insect has 

 not become established. 



