THE MONTHLY BULLETIN. 



333 



The Red Scale. 

 Another destructive scale enemy of the citrus is the so-called red 

 scale. This scale is reddish, circular and flat, and the females are from 

 one sixteenth to one eighth of an inch in diameter. The young are 

 usually produced from June to September, or even longer in milder 

 sections. It is distributed throughout the southern citrus belt, par- 

 ticularly in San Diego, Orange, Los Angeles, Eiverside, San Ber- 

 nardino and Santa Barbara counties. Fumigate with Schedule No. 1 

 made by R. S. AVoglum of the United States Bureau of Entomology! 

 This dosage consists of one and one half ounces of potassium cyanide, 

 one and one half fluid ounces of sulphuric acid and four and one half 

 fluid ounces of water to every 100 cubic feet of air space. 



Fig. 88. — Yellow Scale, Chrysomphalus citrinus Coq. on orange 

 leaf. (After Essig. ) 



The Yellow Scale. 

 This scale resembles the red scale but is more yellow in color, lies 

 flatter upon the leaf and is sometimes larger in diameter. The red 

 scale attacks all parts of the tree while the yellow scale attacks almost 

 entirely the leaves and fruit. The yellow scale occurs throughout the 

 entire citrus growing sections of the State. The method for control is 

 the same as that for the red scale. 



