hee PICT ec Sa are ee en Coie eae it Se mai ses gt etc foe Leet ep ees ele E 
ee Se ee Be ee aR O 
GRAPE DISEASE. 627 
could only be found and destroyed, it would be one way of effec- 
tually heading off the evil; and in a new vineyard a little vig- 
ilance in searching for these galls might save much subsequent 
loss and labor. I shall not treat here of the natural enemies of 
the louse, which are of such a nature that they cannot be practi- 
cally controlled and increased. 
Destruction of the Root-Lice.— I hope next spring to institute 
a series of experiments on the root-lice, with a view to the discov- 
ery of a practical remedy. It were to be desired that others 
having opportunity and occasion would do likewise. Here is an 
excellent chance for our different agricultural colleges, which have 
greater means and facilities than any one individual can possibly 
have. As a guide to such experiments, and to profit as much as 
possible by the experience of others, I will synopsize the results 
of trials in France. From these results, which I give below, we 
may learn that no reliable and cheap remedy, that will destroy 
all the lice after they have become numerous, has yet been 
discovered ; and the best advice that can at present be given is to 
guard against the insect’s introduction into new vineyards by 
carefully examining the roots before planting. If knots and lice 
are found upon them the latter may be destroyed by the same 
means used against the Apple root-lice —i.¢., by immersing the 
roots in hot soap-suds or tobacco-water. 
Preparations of carbolic acid have, so far, given most satisfac- 
tion, and I have great hopes of benefit from the saponaceous 
compound prepared in this country by James Buchan & Co., of 
New York. This compound is not yet manufactured in France, 
where they have to use the pure acid or the crystals. 
Carbolic acid added to water at the rate of one-half to one per 
cent. has been successfully employed, and M. Leenhardt, of 
Sorgues, has -by its use, succeeded in keeping his vineyard alive 
and bearing, while all those around him are destroyed. He uses a 
heavy bar, thickened and pointed at the end, wherewith to make 
two or three holes, a foot or more deep, around the base of each 
vine. He then fills these holes with the liquid, which gradually 
permeates the soil in all directions. A good post-hole auger, such 
as we use in this country, would work more rapidly, with the 
advantage of compressing the earth less, but it would do more 
injury to the roots. 
Oil of Cade.— This empyreumatical oil, which is common and 
