374 INSECTS INJURIOUS TO THE CRANBERRY. 



FIG. 386. 



bog. There are not usually more than two of these larvae on 

 any one shoot, and often there is only one. The mischief done 

 consists mainly in the killing of the extreme tip of the vine, 

 which prevents the formation of a fruit- 

 bud for the next year's growth, unless, as 

 is sometimes the case, the vine by an 

 extra eifort puts them out at the side. 



Remedies. There is a little Chalcis 

 fly parasitic on this insect, which destroys 

 it in large numbers. The measures rec- 

 ommended under No. 227 will also be 

 applicable here. 



No. 235. The Cranberry Aphis. 



There is a large, red plant-louse which 

 sometimes occurs on cranberry-vines and punctures the leaves 

 and tender stems, to their manifest injury. This aphis is 

 destroyed by the larva of a small lady-bird, a species of 

 Scymnus, which larva is oval in form, and covered with a 

 white fuzz on its back. Flooding will destroy this aphis 

 also. 



No. 236. The Cranberry Spittle Insect. 



Clastoptera proteus Fitch. 



This is a small, soft insect, with legs, but without wings, 

 which is found in the early part of June in little masses of 

 froth upon growing shoots of the cranberry-vine. The froth 

 is the sap of the plant sucked in and then exuded by the 

 young larva, probably for concealment. The insect belongs 

 to the order Homoptera, having no jaws, but a beak, through 

 which it sucks the sap of the plant. 



The perfect insect jumps with the agility of a flea, and is 

 found hopping about among the vines. It seldom occurs in 

 sufficient numbers to inflict material injury. It is found also 

 on the blueberry. 



