INJURIOUS AND BENEFICIAL INSECTS OP CALIFORNIA. 



173 



Jones 95 has obtained good killing results with a 12 per cent solution 

 of crude oil emulsion. 



THE CALIFORNIA BUCKEYE SCALE 

 Aspidiotus obscuU Johnson 

 (Fig. 151) 



Description. — The female scales are light gray, conforming well to 

 the color of the bark. They are nearly circular, flat and ^ inch in 

 diameter. The exuviae are orange colored and central or nearly so. 

 The bodies of the females are pale yellow. The male scales are the 



same color as the females, but are 

 much smaller and decidedly elon- 

 gated. The species is quite prolific 

 and the scales may be so abundant as 

 to overlap. 



Nature of Work. — On the Cali- 

 fornia buckeye. Msculus cciUformcus, 

 the scales produce decidedly flattened 

 areas and pits, which greatly disfigure 

 the branches. This does not seem to 

 occur on other hosts. 



Distribution. — The species exists 

 quite plentifully in the Santa Clara 

 Valley. It has also been taken in 

 Tulare County by <i. P. Weldon and 

 in Yolo County by Mr. Leroy Childs. 

 Food Plants. — The California buck- 

 eye appears to be the favorite host, 

 but the scale has also been taken on 

 poplar by G. P. Weldon, on bur-oak, 

 linden and pear by others and on wil- 

 low by Leroy Childs. 



Control. — The control measures are 

 the same as for the San Jose scale. 

 Aspidiotus perniciosus Comst. 



PUTNAM'S SCALE 



Aspidiotus ancylus (Putnam) 



(Diaspis ancylus Putnam) 



Fig-. 151. — The California buckeye 

 scale, Asvidiotus usculi Johns., on 

 poplar. Enlarged twice. Collected at 

 Porterville, Cal., by Geo. P. Weldon. 

 ( i Original > 



Description.- The female scale is 

 slightly wider than long, or nearly 

 circular, flat, blackish-brown with 

 gray margin and pale yellow subcen- 

 tral exuvia. The diameter is from 1-20 to T V inch. The body of 

 the female is pale or orange-yellow marked with small light spots. 

 The male scale greatly resembles the female but is smaller and more 

 elongated, being 1-20 inch Long and one half as wide. 11 " 



85 Bul. No. SO. pt. VIII, Bur. (Out. 1 T . S. [>rpt. Agrio.. 1910. 



»°Corristock, J. H., Rept. Com. Agrio. U. S. Dept. Agric. pp. 292, 293, 1880. 



