Kew York Agricultuual Experiment Station. 301 



light. With this in mind 20 larvse were placed on each of 10 

 smooth-skinned apples. Immediately after being infested half of 

 the apples were placed on shelves in the laboratory, stem end 

 down and half blossom end down. In two days all had settled 

 and in every case abont three-fourths settled on the under side 

 where there was the least light, the remaining one-fourth being 

 scattered. 



It is also very noticeable that on infested apple and pear fruits 

 a majority of the yonng scales will be fonnd grouped about the 

 adults. An examination of a large number of infested fruits,, 

 including apple, pear, quince, plum and peach, showed about 

 eight-tenths of the young scales gathered about the adults that 

 had made slight depressions in the fruit, probably as a result 

 of sucking the juice and the consequent withering of the tissue^ 

 while but comparatively few were found about those that had 

 not made a depression. A number of typical groups are shown 

 much enlarged at Plate XLIX, Figs. 1, 2, 3 and 4. At Fig. 3 a 

 male scale is shown with a number of young about it. At Plate 

 LI, Fig. 1, a large group is shown, also much magnified. 



Mortality of th^ larvcc. — The active larvae are very small and 

 comparatively delicate, and probably under ordinary conditions 

 a large percentage do not succeed in passing the active period. 

 To ascertain the mortality among larvse kept as near normal con- 

 ditions as possible, seven adult females were kept under obser- 

 vation for several weeks. They were enclosed in cells like those 

 described on page 316. The temperature of the room in which 

 they were kept varied from 70° to 75° F. during the day and 

 dropped to about 60° at night. The scales were removed from 

 three of them. The mortality among the larvse from these 

 females is shown in the following table; 



