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THE MONTHLY BULLETIN. 



THE YELLOW SCALE. 



The yellow scale resembles the red, but is more yellowish in color, 

 lies flatter upon the leaves, 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. This insect is widely distributed 





Fig. 85. — The yellow scale, Chrysomphalus citrinus, on orange leaf. (After Essig, 

 Injurious and Beneficial Insects of California, State Comm. Hort. ) 



throughout the entire citrus growing section of the state, and is 

 especially abundant in the interior valleys. Besides the citrus it 

 attacks India rubber, English ivy, citron and several other plants. 



THE CITRUS MEALY BUG. 



The most widely distributed mealy bug attacking citrus trees is the 

 citrus mealy bug, Pseudococcus citri. This mealy bug occurs in every 

 greenhouse throughout the state, but is a pest occasionally in Ven- 

 tura, San Diego and Los Angeles counties. This insect is a soft-bodied 

 mealy-coated, sucking insect, being about one-fourth inch in length 

 in the adult stage. The female deposits large numbers of yellowish 



