140 Report OF THE DEPARTMENT OF BOTANY OF THE 
Some persons thought they saw evidence that the single appli- 
cation of Bordeaux for worms had lessened the amount of dam- 
age from anthracnose. In the plantation of Mr. A. B. Clarke at 
Milton, we observed that in one portion anthracnose was con- 
siderably more severe than in an adjacent portion. Upon inguiry 
as to the cause we were informed that one portion had ‘een 
sprayed once with Bordeaux mixture while the other had not, 
In this case there appeared to be a marked benefit from spray- 
ing; but in general the Bordeaux applied for worms did not have 
much effect on the anthracnose. Probably the application was 
made too late. 
In the absence of experimental data we can only make sugges- 
tions as to treatment. Bordeaux mixture will probably control 
the disease, but the spraying must be commenced early. In view 
of the fact that the anthracnose fungus inhabits the canes, the 
first application should be made on the bare canes before the 
leaves appear.” Special attention should be given to the new 
wood because there is where the spores are most abundant. In 
fact no spores have yet been found on the old wood. However, 
the old wood should also be sprayed, because it is possible that 
some spores do occur on it, and also because of the possible 
effect on cane blight. Howthe fungus of cane blight gets into the 
canes is not known, but there is good reason for believing that 
thorough spraying of the canes will have a tendency to prevent 
* Wor the first treatment a strong solution of copperas (iron sulphate) 
may be used instead of the Bordeaux. Make a saturated solution (that 
is, add copperas to water until no more will dissolve) and apply while 
the buds are swelling but before they break. By some, this treatment is 
thought to be beneficial for grape anthracnose (See N. Y. Agr. Exp. Sta. 
Bul. 86:79; and Bul. 170:410), particularly when about one per cent. of 
sulphuric acid is added to the copperas solution. But if the sulphurie — 
acid is added the mixture can not be applied with a spraying machine, 
because it is so very corrosive. In that case it must be applied with a 
swab or whisk broom. The fungus of grape anthracnose is closely 
related to that of currant anthracnose and there is some reason for 
believing that any treatment which is successful for the one would be 
successful for the other. Nevertheless we have recommended Bordeaux 
mixture for the first treatment for the following reasons: (1) Bordeaux 
is likely to be equally effective; (2) The treatment is less complicated; 
(5) There is no danger of injury to the plants or to the sprayer. 
