24 SCALE INSECTS. 



duced to 100 feet. It will be readily seen that nursery 

 Btock can be easily treated by removal from nursery, large 

 quantities heeled in in small space, and. since leaves are re- 

 moved and nature has clothed the tree for winter, a stronger 

 gas will make the work even more effectual. 



THE CHERRY SCALE. 



(Asjiidiotus forbcsii Johnson.) 



This speci'^s is closely allied to the San Jose scale, and 

 might be mistaken for it. The outward characteristics that 

 will probably enable the average observer to distinguish it 

 from the San Jose scale is that the cherry scale inhabits 

 the trunk of the tree, frequently seeking refuge under the 

 loose bark of the tree, making it jjossible for it to exist for 

 a long time unnoticed. The San Jos6 scale, on the other 

 hand, prefers the twigs and outer branches. Figures show- 

 ing the various stages would convey no information to the 

 general reader additional to that obtained from observa- 

 tions upon the plates illustrating the San Jos6 scale. 

 These specific differences are largely microscopic. 



Food Plants. While it has not been found on as many 

 plants as the San Jose scale, it is supjaosed that its food 

 range is much the same. Mr. Johnson finds its favorite 

 food to be the cherry; hence gives it the poj^ular name of 

 " Cherry scale." 



LiFE-HiSTORY. The life circle of this scale is much the 

 same as the San Jose scale, except that the number of 

 broods may be less. 



Distribution. Illinois, New Mexico and Kansas are 

 the only points known to me. The fact that it has existed 

 in Kansas in one locality (though the infested trees were 

 all burned ) is of great significance, since it is second in 

 destructive power to the pernicious or San Jos^ scale. 



Description. — Scale of Femah'. The general shape 

 of the scale of the female is nearly circular, but it varies 

 according to tlie i)osition of attachment, as .scales under a 

 fold in the bark or on some uneven surface are very irregu- 

 lar in outline. The color is dirty grayish in fresh speci- 



