260 FRUIT INSECTS 



colonies. A few, however, may remain on the plum throughout 

 the season. At the approach of cold weather winged forms 

 are produced that return to the plum and there give birth to 

 a brood of winged males and wingless females, both sexes being 

 nearly black in color. The female deposits the winter eggs 

 upon the bark of the smaller branches, usually near the buds. 



Treatment. 



The usual sprays for plant-lice are effective against this 

 species, but as the infested leaves curl badly, the application 

 should be made as soon as the insects appear. Thorough ap- 

 plications of lime-sulfur at the strength used against the San 

 Jose scale are said to kill the eggs in Oklahoma. 



References 



Scott, U. S. Bur. Ent. Bull. 31, pp. 56-59. 1902. 

 Ga. State Bd. Ent. Bull. 17, pp. 99-101. 1905. 

 Col. Agr. Exp. Sta. Bull. 133, p. 41. 1908. 

 Okl. Agr. Exp. Sta. Bull. 88. 1910. 



The European Fruit-tree Scale 



Aspidiotus ostreceformis Curtis 



This scale insect closely resembles Putnam's scale and the 

 cherry scale in size and general appearance and can be dis- 

 tinguished from them only by microscopic characters. The 

 full-grown female scale is nearly circular, about y^ of an inch 

 in diameter, dark, ashy-gray in color and is usually easily dis- 

 tinguished from the San Jose scale by the exuvial spot, which, 

 instead of being blackish and central, is dark orange colored and 

 located a little to one side of the center. Probably introduced 

 into New York State from Europe on orchard cuttings about 

 1870, this scale is now widely distributed in Canada and the 

 northern United States. 



The bark of plum, apricot, currant and soft maple trees are 



