172 



THE CANADIAN lIOimGTJLTUiriST. 



THE GRAPK-VINE GALL LOUSE (PUlloxera Vadatnx.) 



During the present season a number of packages liave l)een 

 Teceived containing grape-vine leaves infested witli tlie Gall Louse, 

 accompanied with letters of enquiry as to the cause of this strange 

 appearance, and whether it betokens serious consequences to the grape 

 vines. Fro'm the number of the»3 enquiries, we are led to believe that 

 there may be a number of our readers Avho would be interested in an 

 account of this insect,, for it 

 seems to be on the increase, 

 and may appear next season in 

 vineyards where it has not 

 hitherto been observed. 



The accompanying en- 

 graving, fig. 11, represents the 

 under side of a leaf covered 

 with the galls, which are fleshy 

 cup-shaped, sometimes purse- 

 shaped swfellings, wrinkled and 

 hairy; while the upper side of 

 the leaf sliews corresponding 

 depressions, which look like S'igk 11. 



minute cups, having their rims so drawn together as to form small, 

 fuzzy, fimbriated mouths, opening into the cups below. A section of 



one of these cups is 

 shewn in fig. 12, at d, 

 considerably magnified, 

 so that the opening on 

 the upper side of the leaf, 

 surrounded and guarded 

 by miiiute hairs, can be 

 distinctly seen, the dark 

 part below representing 

 the form and position of 

 the cup, with its fleshy 

 walls covered with ha-lrs. 

 These galls may be 

 found iBJthe early part of the summer, shortly after the leaves have- 



