226 REPORT OF THE BOTANICAL DEPARTMENT OF THE 
was too dry for late blight. During July the plants were 
considerably injured by plant lice. 
At digging time the potatoes were sorted and weighed | in the 
usual manner. The yields were as follows: 
TaBLE XV.—YIELDS IN THE EXPERIMENT AT RIVERHEAD IN 1908. 







Yield per row.§ Yield per acre. 
bs Treatment. a ae = ——— 
3 Marketable. | Culls. Marketable. Culls. 
Lbs. Lbs. Bu. Lbs) ) Sa abs 
1 | Sprayed 3 times....... 1894 4 157 5513 20 
2'| Sprayed 5 times....... 202 34 168 20 1:2 55 
So) Unsprayed sig sen sicknst 1634 b 136 Lovie 55 
4 | Sprayed 3 times....... 1594 2 132 55 | 1 40 
5 | Sprayed 5 times....... 173 34 144 1042 55 
Gh (I nspraved ea Meh. <5 pit). 172 3 148 20 | 2 30 
7 | Sprayed 3 times....... Lia 4 147 30 | 3 20 
8 | Sprayed 5 times....... 178 5 148 20 | 4 10 
9 S Cinsprayed (ia sie cts oy, 1474 41 122 55 | 3 45 
10 | Sprayed 3 times....... 179 3 149 LO hee 30 
11 | Sprayed 5 times....... 1794 + 149 35 | 3 20 
2A) Unsprayied is tid be i tay: 184 4 153 20 | 3 20 
13 | Sprayed 3 times....... 1804 4 150 25 | 3 20 
14 | Sprayed 5 times....... 1804 5 150 25 | 4 10 
Leu inspira ved oy eto bee 154 3 128 20 | 2 30 


° Rows 290.4 feet long by three feet wide making the area of each row exactly 
one-fiftieth acre. 
TaBLE XVI.—YrievLp By Serius AT RIVERHEAD IN 1908. 


Series. Rows. Dates of spraying. Yield per acre.” 
Bu. lbs. 
Bier Tei" 1.4, 7,10 and 13.| June 11, July 9 and Aug. 4..| 147 35 
DY ere. 2} 5, 8, 11 and 14.| June ma 25, July 9, 24 and 
Aug 40 ou ee il 152 10 
LL Sere ei 3, 6, 9,12 and 15.) Not sprayed.:. 0... . 7 cue 136 50 
7 Marketable tubers only. 
Increase in yield due to spraying three times, 102 bu. per acre. 
' Increase in yield due to spraying five times, 154 bu. per acre. 
