86 



The San Jose Scale, {Aspidiotus pernlciosus) 



Oom stock. 



a. 



Pig. 1. — Appearance of scale on bark: a. infested twig, natural 

 size; b, bark as it appears under hand lense, showing scales in 

 various stages of development, and young larvae. (Howard and 

 Marlatt, Bui. No. 3, New Series, Div. of Entomology, U. S. Dept. of 

 Agr.) 



How to detect it. — This scale is very small and it is 

 rather difficult for an inexperienced eye to detect it. 

 Roughly si>eaking, it is about the size of a pinhead. Seen 



I'he description of the San Jose scale: New Peach scale; Black 

 Knot; Peach Yellows and the Peach and Plum Rosette are by Prof. 

 W. M. Scott, State Entomologist of Georgia; and those of the 

 "Woolly Aphis and Crown Gall are by Prof. S. A. Forbes, Stat« 

 Entomologist of Illinois. 



