ATTACKING THE CANES. 



309 



Fig. 320. 



Fig. 321. 



'n carrying out her instinctive desires to protect her progeny, 

 becomes such an enemy to the raspberry-grower. She is fur- 

 nished with a long ovipositor, 

 which she thrusts obliquely 

 more than half-way through 

 the cane, and down the open- 

 ing thus made she places one of her eggs, wliich are yellowish 

 and serai-transparent, about one-eighth of an inch long, and 

 narrow; a second one is then placed, in the same manner, 

 alongside of the first, and so on, until from five to fifteen eggs 

 have been placed in a row. In Fig. 321 

 is shown a piece of infested cane ; a rep- 

 resents the irregular row of punctures in- 

 dicating the presence of the eggs ; 6, the 

 same laid open, showing the eggs in posi- 

 tion ; at c is a magnified egg, while d 

 shows the granulated head of the same, 

 still more highly magnified. Owing to ^ 

 the presence of these eggs, the cane is 

 much weakened, and is liable to break on 

 slight provocation ; sometimes the part 

 beyond the punctures dies, but if it sur- 

 vives, and escapes being broken in winter, 

 it is very apt to break from the action of 

 the wind on the weight of foliage as soon 

 as it has expanded in spring, and the crop 

 which would otherwise be realized is lost. 

 As soon as the spring opens, the eggs 

 begin to swell, and about midsummer, 

 or sometimes a little earlier, the young 

 insects hatch, which much resemble the 

 perfect insect in form, but lack wings. They at once leave 

 the raspberry canes and do no further injury to them. At 

 first they feed more or less on plant-lice, ajd later in the 

 ocason on ripe fruits and other succulent food, jiicsides in- 

 juring the raspberry and blackberry, they attack ihe canes 



