17 



to collect along the midrib, on the upper side of the leaf, in one 

 or more quite regular rows, and also to some extent along the 

 side ribs. The infested leaves turn brown, but do not have a 

 tendency to fall as a result of the damage." 



Fig. 12. San Jose Scale : a, young larva — greatly enlarged ; b, antenna of 



same — still more enlarged. 



This pest is most likely to be introduced into new localities 

 upon nursery stock imported from infested regions. This is 

 belie,ved to be the way in which it was first brought to the 

 Eastern states. It is also likely to be carried upon fruit sent 

 to market. In a given locality the insects are most likely to be 

 carried from tree to tree and orchard to orchard by the young 

 lice crawling upon insects and birds and then crawling off after 

 they have lit upon other trees. They may also be blown about 

 by the wind. 



The young lice are easily destroyed by spraying with kero- 

 sene emulsion. But in cases where the insect is first intro- 

 duced to a new locality, the infested trees should be burned to 

 check the outbreak. 



