248 THE POME FRUITS 



diligent work. The essential step consists in cutting out 

 the blight in places where it may winter over. Where the 

 blight is thoroughly pruned out during the fall and winter 

 there would probably be no opportunity for infection the 

 following season if care is exercised in preventing it from 

 being carried in from other regions. When pruning, the 

 knife should be disinfected after every cut by immersing it in 

 a solution of bichloride of mercury. This serves to prevent 

 the spread of the disease. Spraying is of no value. 



Pear Scab. — The scab found on the pear is closely related 

 to that of the apple and quite generally referred to as a 

 distinct species. The parts affected are the same as those 

 on the apple. However, the scab on the pear seems to be 

 more destructive and causes the fruit to crack open when 

 it is very abundant. 



Some varieties of pears are less susceptible to the attack 

 of this disease, and the Bartlett, Kieffer and Le Conte seem 

 to be the least affected. 



The same remedies recommended for the control of the 

 scab on the apple are used for the pear. 



In addition to the diseases mentioned there are several 

 more which are common to the pear, and are also found on 

 the apple. These are discussed under the apple and can be 

 controlled by the same methods as recommended for the 

 apple. 



INSECTS OF THE PEAR. 



Many of the insects found on the pear are also common 

 on the apple. Only those insects which particularly affect 

 the pear are discussed. The most injurious insects to the pear 

 are the codling moth, the San Jose scale, the pear psylla and 

 the pear thrips. The codling moth and the San Jose scale 

 are discussed under the apple. 



Pear Psylla. — The pear psylla is imported from Europe, 

 and it is generally distributed over the country. It varies in 

 abundance from year to year in different localities. Badly 

 infested trees take on a sickly appearance early in the 

 season, the leaves turn a brownish color, dry up and fall 

 off early in the summer. The fruit falls prematurely. 



