244 



INSECTS INJURIOUS TO THE GRAPE. 



Fio. 251. 



cases are polished and glossy, without any markings. It 

 appears during the early part of July, when the female punc- 

 tures the stem of the vine and deposits an egg 

 therein, which shortly hatches, producing a tiny 

 whitish grub, which lives within the swollen 

 part and feeds upon it. At first the gall is 

 small and inconspicuous, but towards the end of 

 the season it assumes the form of an elongated 

 knot or swelling, as shown in the figure ; this is 

 generally situated immediately above or below a 

 joint. Usually there is a longitudinal depres- 

 sion on one side, dividing that portion into two 

 prominences, which commonly have a rosy tint. 

 Within the gall the larva remains until June 

 of the following year. When full grown, it is 

 about a quarter of an inch long, 

 white, cylindrical, and footless, with 

 a large yellowish head. During 

 the month of June it changes 

 to a pupa, from which the perfect 

 beetle is produced in about a fort- 

 night. 



These galls do not appear to injure to any material extent 

 the branches on which they occur; should they ever multiply 

 so as to become injurious, their increase may be readily checked 

 by cutting off and burning those portions of the canes on which 

 they are situated, before the beetles escape. 



ATTACKING THE LEAVES, 

 No. 132. The Green Grape-vine Sphinx. 



Darapsa myron (Cramer). 



The larva of this insect is one of the most common and 

 destructive of the leaf-eating insects injurious to the grape. 



