68 



[NSECTS AFFECTING THE PEAR. 



and shortly afterwards leave the tree. Having 

 reached the ground they enter the soil two or three 

 inches, and form an oval cavity in the earth, which 



Fig. 29. Pear-tree Slug: fly and larvse. 



they line with a glossy secretion. The larval skin 

 is now east, and the insect becomes a pupa. About 

 a fortnight later it again changes, this time to a 

 four-winged fly, that escapes to continue the propa- 

 gation of the species. There are two broods each 

 season in the Northern States, the first brood of 

 larva' appearing in June, and the second in August. 

 The winter is passed in the pupa state. 



Remedies. — This Pear Slug is very easy to de- 

 stroy, and should be checked as soon after it begins 

 operations as possible. Spraying with the arsenites, 

 or pyrethrum, or hellebore, is a simple and effectual 

 remedy. Or these substances may be dusted on with 

 a bellows gun. 



The Pear-leaf Mite. 



Phytoptus pyri. 



The leaves of the pear are sometimes noticed in 

 spring to have small reddish spots upon their upper 

 surface. As the season advances these spots become 

 darker colored, and finally appear almost black, the 



