202 



AGRICULTURE OF MAINE. 



LIFE HISTORY. 



As usually found on the tree or shrub thev appear as verjr 

 small, somewhat circular scales, irregular in outline, and when 

 mature, somewhat resembling- a miniature volcanic cone. They 

 are so small as to appear indistinct to the naked eye and a pocket 

 lens is needed to determine them. \\%en young they are of a 

 grayish white color, turning darker with age. Fig. ii in the cut 

 gives a good illustration of them showing the natural size and 

 magnified. 



CL 



SAN JOSE SCALE. 



Fig. 11. Aspidiotus perniciosus; a, infested twig, naturay 

 size; b, barlr as It appears under hand lens, showing scales 

 in various stages of development and young larvae 

 (Howard and Marlatt. Bulletin 62, Div. of Entomology, U 

 S. Dept. of Agri.) 



If abundant these scales overlap as do those of our common- 

 oyster-shell bark-louse, and the surface is rough to the touch, 

 the tree has lost its thrifty appearance and soon dies. As the- 



