88 Report OF THE BOTANIST OF THB 
On September 4 the contrast between the sprayed and un- 
sprayed rows was very marked. Many unsprayed plants were 
entirely dead, while on many more one-third to one-half of the 
foliage was dead, and all of the plants had lost their lower 
leaves. or the first time there now appeared to be a slight 
difference between the rows of series I (Sprayed three times) and 
those of series II (sprayed every two weeks). The latter were 
still almost perfect in foliage, while the former showed a con- 
siderable number of blighted leaves and also some yellow leaves. 
On September 10 practically all of the unsprayed plants were 
cead. A few plants still had a few green leaves at their 
tips. Both sprayed series now showed many leaves browned at 
the tips, and there was somewhat more of this on series II than 
‘on series I. Miscroscopic examination showed that this tip 
browning was chiefly due to some other cause than Phytoph- 
thora. In the majority of cases no Phytophthora could be found. 
Only a few dead stalks were found on the sprayed rows. 
_ An interesting observation made at this time was that stalks 
from the sprayed rows lopping over to the ground in the direc- 
tion of the adjacent unsprayed row were usually dead; whereas 
stalks from the same rows lopping on the ground in the opposite 
direction, toward a sprayed row, were still green. 
By September 16 the plants on series I and IT had. commenced 
to die. Many stalks were brown and on almost every hill there 
were indications that growth was nearly ended. 
By September 22 the unsprayed plants were all dead and their 
stems mostly dry. On the sprayed rows about 25 per ct. of the 
plants still had sufficient foliage to enable them to make some 
growth, but this date is to be considered as practically the close 
of the growing period of series I and II. The difference be- 
tween the two series was so slight.as to seem unimportant. 
On all of the unsprayed rows, and on the sprayed rows as well, 
the plants died very irregularly, some earlier and some later, 
making it difficult to determine the exact time at which the plat 
as a whole was to be considered dead. Hence it was difficult to 
determine exactly how much the sprayed plants outlived the un- 
sprayed plants. However, it may be said that the sprayed plants 
were in somewhat better condition on September 22 than the 
= 
