126 REPORT OF THE BOTANICAL DEPARTMENT OF THE 
Late blight, Phytophthora infestans, was first found on the un- 
sprayed rows August 12. It spread slowly. In fact we regarded 
this as a rather mild attack. However, as a result of the com- 
bined attack of flea beetles, tip-burn and late blight the unsprayed 
rows (excepting row 3) died fully two weeks earlier than the 
sprayed rows of Series I and II. Row 3, having been sprayed once 
by mistake, remained green a few days longer. The contrast in 
appearance between. the sprayed and unsprayed rows was very 
marked but not as striking as in 1904. It was probably greatest 
about September 21, at the time the photograph shown in Plate I 
was taken. Between Series I, sprayed only three times, and Series 
II, sprayed five times, there was no apparent difference in foliage. 
On September 26 each series still retained somewhat less than one- 
half of its foliage. By October 3 practically all of the plants were 
dead. 
At Riverhead.—In the experiment at Riverhead late blight did 
no damage whatever, not even to the unsprayed rows. Flea beetles 
and early blight were the chief enemies fought. According to their 
usual habit, flea beetles appeared while the plants were small, about 
June 10, and again, in hordes, when the plants were full grown 
about the middle of July. On July 29 there was a marked differ- 
ence between the foliage on Series II and that on Series I and III. 
Series I and III were severely injured by flea beetles, but thorough 
spraying had prevented most of the injury, on Series II]. Here 
again, the value of bordeaux mixture as a remedy for the flea 
beetle was clearly shown. 
Early blight appeared about August 1. It did some damage to 
Series II, but considerably more to Series I and III. . Unlike the 
experiment at Geneva, we had here much better foliage on Series 
II, sprayed five times, than on Series I, sprayed three times. 
AS SHOWN RY THE YIELD, 
At Geneva.—The potatoes were dug by hand October 21. At 
this time the unsprayed plants had been dead over a month and the 
sprayed plants about 18 days. ; 
The product of each row was carefully sorted into three grades 
—marketable, rotten and culls. According to our usual method, 
all sound tubers larger than a hen’s egg were graded .as market- 
able. 
