INSECTS INFESTTNCl THE GRAPE. 



175 



done by the attack of the grape-root louse, the value of the 

 grapes would lie destroyed to a great extent for making fine 

 wines." 



Fig. 15 3.— 

 Grape-root Louse 

 (gal l-inhal)iting 

 form) ; rZ, a gall 

 in the leaf cut 

 open ; e, a gall in 

 the tendril ; r, an 

 egg, liighly mag- 

 nified — color, pale 

 y e 1 1 o w ; />, back 

 view of newly 

 hatched louse, en- 

 larged ; a, ventral 

 view of the same, 

 enlarged — color, 

 yellow ; /, <j, and /), adult female lice — side view, back view, 

 and ventral view, enlarged; i^ an antenna — color, (n-ange-ycl- 

 low, greatly magnified; _/, a foot, greatly magnified. 



To this argument I only answer : Taking into consideration 

 the general richness of the lands yet to l)e planted in this 

 State, the visitation of this pest may be considered a ben- 

 efit rather than a misfortune to the vine-growers who grow 

 grapes for wine-making purposes. In regard to grapes grown 

 for table use and raisin making, the objection to the use of 

 fertilizers is untenable, as I know a very extensive grower of 

 these varieties who has been very successful in maturing heavy 

 crops of a choice (piality by the use of fertilizers. A vine- 

 grower residing Avithin forty miles of Sacramento had thirty- 

 nine acres, princijiall}^ table grapes, which netted him a revenue 

 of nearly six thousand dollars per year. The vines commenced 

 to decay to such an extent that thirty-four acres were dug out 

 and peach and apricot trees were planted in their place, and 

 these are in full bearing at the present time — June, 1888. It 

 was ascertained afterwards, by examining some of the roots 

 left in the ground, that the grape-root louse was the cause of 

 the decay of the vines. The few acres remaining were found 



