THE CANADIAN ENTOMOLOGIST. 



127 



each vine with an iron bar to the depth of a foot or more. Soot is also 

 recommended, to be strewed around the vines. 



It is stated that the insect is less injm'ious to vines grown on sandy 

 soil ; also to those grown on lands impregnated with salt. 



Since large numbers of these insects, both winged and wingless, are 

 known to crawl over the surface of the ground in August and September, 

 it has been suggested to sprinkle the ground about the vines at this period 

 with quicklime, ashes, sulphur, salt or other substances destructive to 

 insect life. The application of fertilizers rich in potash and ammonia 



have been found useful, such 

 as ashes mixed with stable 

 manure or sal-ammoniac. 



A simple remedy for the 

 gall-inhabiting type is to pluck 

 the leaves as soon as they 

 show signs of the galls, and 

 destroy them. 



Several species of predace- 



FiR. 1 8. '■ \ 



ous insects prey on this louse. 

 A black species of Thrips with white fringed wings deposits its eggs within 

 the gall, which, when hatched, produce larvffi of a blood red color, which 

 play sad havoc among the lice. 

 radicum, which feeds on the 

 root louse of the apple, see 

 figure 1 8, has also been found 

 attacking the Phylloxera. An- 

 other useful friend is a small 

 mite, Tyroglyphiis phylloxera^ 

 P. & R., see fig. 19, which 

 attacks and destroys the lice, 

 and associated with this is 

 sometimes found another 

 species, Hoplopho7-a arcfata 

 Riley, of a very curious form, reminding one of a mussel. The lice are 

 also preyed on by the larva of a Scymnus, a small dull colored lady bird ; 

 also by several other species of the lady-bird family, and by the larvae of 

 lace-wing flies. 



The larva . of a Syrphus fly, Pipiza 



Fig. ig. 



