128 REPORT OF THE BOTANICAL DEPARTMENT OF THE 
Experiment No. 43.—The unsprayed rows were severely at- 
tacked by blight and died two weeks earlier than the sprayed 
rows. Mr. Fleet states that there was no rot in sprayed or un- 
sprayed potatoes, notwithstanding the plants were killed by 
blight quickly and the soil very wet at the same time. 
Experiment No. 44.— Mr. Bennett expresses the opinion that 
it is unsafe to leave unsprayed rows in a sprayed field because 
of the tendency of blight to spread from the unsprayed rows to 
the sprayed ones. This was plainly the case in his experiment. 
He left three unsprayed rows at one side of the field near his 
barn. These rows became affected with late blight quite early. 
When we saw them on July 18 they were already nearly dead 
from blight and several sprayed rows next to them were also 
severely attacked while the field in general was searcely affected. 
It seems probable that fowls running among the plants assisted 
in spreading the spores of the blight fungus. 
The items of expense for spraying 4.75 acres 8 times were as 
follows: 
Bay Ibs. copper sulphates. < sual. «a Wades Fo eed sco a eee $15.10 
Lime. So. AS Fey ee eee ii WS ois eet 2.50 
4 days labor’ for man‘ and horse st 2. oe 2 12.00 
Totals icc eue ie 0 eet ® ate Hee epee: Les ee $20.60 
It is probable that the actual gain due to spraying was greater 
than is shown by the test rows. 
Experiment No. 45.— Six rows were left unsprayed. The’middle 
four unsprayed rows yielded 25 bushels marketable tubers while 
four sprayed rows adjacent yielded 30 bushels of marketable 
potatoes. Mr. Allen was.suprised to find so much difference in 
yield since there had been no difference in the appearance of 
the foliage on sprayed and unsprayed rows. ‘There seems to 
have been little or no blight in this experiment and there was 
no rot among the tubers. 
The items of expense for spraying 7 acres 4 times were as 
follows: 
216 IbS. copper. sulphate: @> 7146.2... 24.0.1 2. cc Se ee $16.20 
216) ibs)limé; @: 20. peri Cwtnis s.r. = a aerate oe eee -43 
¥2, ths, paris Seen i286 ie iiie. ds. <5 miacslate ale ot lor ae ee ae 3.36 
@ idays’WwOLk, Man and meanl sj.) 144. onda aut le 4S oad ada Oo 8.00 
