6 The Bulletin. 



Where the scales are scattering along the branches each scale is often 

 fbut not always) in the center of a slightly reddened spot on the bark. 

 If the natural color of the bark be reddish this spot will not show plainly, 

 but if the bark be of a light green or yellow, the reddish spots are quite 

 conspicuous. In looking for scale on slightly infested trees it may 

 usually he more readily found hy looking for these reddish spots than 

 by looking for the scale itself, hut close watch must he kept for both 

 scales and blotches. If such a spot be found, however, it must then be 





Fig. L— the SAN JOSE SCALE. 



a. Appearance of infested twig, natural size. b. Part of infested twig, as seen under 



a lens. 



(After Howard and Marlett, U. S. Department of Agriculture). 



examined to see if it is caused by a true scale-insect, for there are certain 

 unimportant diseases which may have a similar effect. If the little 

 gray, circular scale is found in the center of the spot, and if the scale is 

 readily moved by scraping gently with a knife blade or with the finger 

 nail, then you may be pretty sure that it is San Jose Scale, and should at 

 once send specimens to the Entomologist and find out. 



Turn one of the scales over gently with the point of a knife. If it is 

 one of the large, full-growTi scales the insect may as likely be dead as 

 alive under it, for the scale often adheres long after the insect is dead. 

 If the insect is alive it will be seen as a little, yellow object — slightly egg 



