The Canadian Horticulturist. 



crawling over the service of the ground in search of more congenial quarters. 

 During the winter many of them remain torpid, and, at that season, they assume 

 a dull, brownish color, so like that of the roots to which they are attached that 

 they are difficult to discover. With the renewal of growth in the spring, 

 the young lice cast their coats, rapidly increasing in size, and soon begin 

 to deposit eggs ; these soon hatch, and the young ones shortly become egg-lay- 



Fig. 46, Showing Rojt Inhabiting Lice. 



ing mothers like the first, and, like them, remain wingless. After several gener- 

 ations of these egg-bearing lice have been produced, a number of individuals, 

 about the middle of summer, acquire wings. These are also females, and they 

 issue from the ground, and, rising in the air, fly, or are carried with the wind, to 

 neighboring vineyards, where they deposit eggs on the under side of the leaves 

 among their downy hairs, beneath the loosened bark of the branches and trunk, 

 or in crevices of the ground about the base of the vine. Occasionally, indivi- 

 dual root lice abandon their underground habits and form galls on the leaves. 



