60 Vict. 



Provincial Board op Horticulture. 



17 



CL 



(Fig 2.) 



Appearance of Scale on bark ; o, infested twig, natural size ; 6, back as it appears under 

 hand-lens, showing scales in various stages of development and young larva. 



( L. 0. Howard and C. L. Marlatt, Bulletin No. .3, New Series, Division of Entomology, 

 U. S. Department of Agriculture. ) 



When occurring upon the bark in large numbers the scales lie close to one another, 

 frequently overlapping, and are difficult to distinguish without a magnifying glass. The 

 general appearance which they present is that of a grayish, roughened, scurfy deposit. When 

 the scales are crushed a yellowish oily liquid will appear coming from the bodies of the insects, 

 and this will indicate to one not familiar with their appearance the existence of living insects 

 beneath the scaly covering. 



The majority of the scales do not exceed one-sixteenth of an inch in diameter, but where 

 only a few are found they become larger, and the females may reach an eighth inch. 



Upon young shoots and leaves where the scales are not so thick the circumference beyond 

 the scales frequently becomes changed in colour to a somewhat purplish or crimson shade. 



The insect is also found on the fruit, and one of its most characteristic points in this case 

 is the bright reddish or purplish discolouration around the edge of each scale. So far as 

 known, this result is confined to this one scale insect. Upon the leaves of infested trees the 

 insects have a tendency to collect along the midribs on the upper sides, in one or more quite 

 regular rows. Infested leaves turn brown, but do not have a tendency to drop as a result of 

 the damage done. 



