INSECTS INJURIOUS TO SHADE TREES. 



79 



THE SAX JOSE SCALE. 

 Plate IV., Fig. 6; Fig. 32. 



This is a small, round, blackish scale that passes the winter 

 in the partly grown condition, comes to maturity in early 

 June, bears living young and reproduces throughout the sea- 

 son so that a slight infestation in spring may mean serious 

 danger before the year is over. Not many of the ordinary 

 shade trees are subject to dangerous infestation Attacks 

 when well grown; but young elms, especially moil than 

 of the European varieties, are sometimes much sh de trees. 

 injured and occasionally killed. 



Fig. 32. The San Jose Scale : a, on a twig, natural size ; b, as seen under a 

 hand lens, much enlarged. Div. Ent., U. S. Dept Agl. 



