12 
It was thought that such a test would be of value in view of the fact 
that the fungicides in question had never been extensively used for 
black rot. 
The third and fourth questions we give below: 
(3) A comparison of Bordeaux mixture, full strength, with the same 
preparation, half strength. Following are the formule: 
BORDEAUX MIXTURE, FULL STRENGTH. 
Copper. suiphate tis. Seal pce oe sce ace eon eae pounds... 6 
aimmres (umslaked)? =. sce Ca ee ee doss a4 
WVia ER carci eee icle a un LENS Gia |e eerste pe on ie ee eves Seno gallons... 22 
BORDEAUX MIXTURE, HALF STRENGTH. 
Copper sulphates 522-2 Vo ee eee oe Sees ae eee pounds... 3 
ne: Cunslakced \. 2d oe os Se alae Bee esr eens do se255 62 
Wea GG Te nd ie Ri SL Mal Se Pe eh ee cea Se ae isn pea Ee gallons.. 22 
This experiment was designed largely as a check on the one where 
the copper in the Bordeaux mixture was reduced to less than one-sixth 
the usual quantity. 
(4) A comparison of the Bordeaux mixture, full and half strength, 
apphed early and late. By early treatment is meant that two apph- 
cations were made before the fruit set. By late, that treatment was 
postponed until the berries were the size of bird shot. The question 
is often asked whether it is worth while to spray after the berries are 
well formed or after the rot has already appeared. ‘To obtain some 
definite information on this point was the main object of this experi- 
ment. 
The fifth question upon which information was desired may be briefly 
stated, as follows: 
(5) A comparison of six treatments using Bordeaux mixture, full 
and half strength, with four treatments, both beginning at the same 
time, 7. e., when the leaves were first starting. 
Taking it for granted that the foregoing remarks have clearly brought 
out the design of the work, we may now turn directly to the experi- 
ments. 
The vineyard in which the work was carried on consists of 6,944 vines, 
the principal varieties being Concord, Clinton, Nortons, Virginia, 
Elvira, Ives, and Missouri Riessling. Nearly all the vines were in 
first-class condition, having been carefully pruned and cultivated every 
year since they were planted. Despite this, however, the fruit during 
the past three years rotted badly, nearly all of the crop being destroyed. 
For the experiments with the eight copper and two noneopper fungi- 
cides 750 Concord vines were selected in the block marked 7 on the 
chart below. 
