1736 



Report of Farmers' Institutes 



instead of having a smooth and polished appearance. Branches 

 that are infested with large numbers of the insect usually show 

 dead twigs, and foliage is sparse. Infested leaves are often 

 marked with red or purplish spots. The apples are rough, 



Fig. 132. Common Scale Insects (much enlarjieil), (a) 

 San Jose Scale, (b) Oyster-shell Scale, (c) Scurvy 

 Scale 



scahbj-like, spotted with red; the reddish discoloration being 

 most noticeable around the marc-ins of the scales. The wonder- 

 ful power of reproduction of this species makes it the most for- 

 midable of our orchard scales. 



THE OYSTER-SIIELL SCALE 



This appears as a browm scale about one-sixth of an inch long, 

 eloselv resembling the color of the bark and somewhat like a long, 

 narrrtw oyster-shell in shape. In some seasons the insects appear 

 in sucli numbers tliat twigs and branches are literally covered, in 

 which event tlie healtli and vigor of the tree is seriously impaired. 



This species is commonly found (m apple and pear. It attacks 

 many other plants. It is reported to have caused severe injuries 

 to mountain ash and horse-chestnut. 



