I.XSKCTS I'AKTH TI.AULY Al-KKCTI.\<; TIIK Al'l'LK 



845 



light brown oyster-shell-shaped scale with a length of about one- 

 ten tli of an inch. This insect is sometimes so abundant as to 

 fairly incrust limbs, particularly of young trees. The winter is 

 passed in the egg stage, the minute, yellowish young appearing 

 the latter part of May or early in June. 



The other common species, the scurfy scale, Chionaspis furfura 

 Fitch, is a snow-white or grayish, irregular, somewhat larger 

 scale than the one just mentioned. It likewise winters in the egg 

 stage, the purplish young appearing the latter part of May or 

 early in June. 



FIG. 232. APHIS APPLES SHOWING CHARACTERISTIC DWARFING AND 



DEFORMATION 



Both of these species are usually well controlled in orchards 

 systematically sprayed for San Jose scale. In case a few trees 

 are seriously infested, a thorough application of any good contact 

 insecticide should be made at the time the young are crawling. 



