58 



SPRAYING CROPS 



scurfy deposit. The natural rich reddish color of the 

 limbs of the peach and apple is quite obscured when 

 these trees are thickly infested, and they have then 

 every appearance of being coated with lime or ashes. 

 When the scales are crushed by scraping, a yellowish 

 oily liquid will appear, resulting from the crushing 

 of the soft yellow insects beneath the scales, and this 



San Jose Scale 



Apple branch, with scales ^zV;' — natural size; enlarged scales above, at left 

 (After Howard) 



will at once indicate to one who is not familiar with 

 their appearance the existence of healthy living scales 

 on the trees.'' 



The young scale lice come out from beneath the 

 female scales, in spring, soon after the unfolding of 

 the leaves. They are minute yellowish creatures 

 which crawl about over the bark a short time, and 

 finally fasten themselves to it, generally on the new 



