224 REPORT OF THE BOTANICAL DEPARTMENT OF THE 
difference between sprayed and unsprayed rows was slight. 
However, the sprayed rows of Series II outlived the unsprayed 
rows of Series III by about five days, owing, apparently, to 
the smaller amount of tip burn and flea beetle injury on the 
sprayed rows. 
The potatoes were dug by hand and sorted and weighed in 
the usual manner. The yields are shown in the following 
table: 
TABLE XIIJ.—YIELDS IN THE EXPERIMENT AT GENEVA IN 1908. 






Yield per row.4 Yield per acre. 
. Treatment. = 
8 Marketable. Culls. “Marketable. Culls. 
| Lbs...|\ | ba, | Bae ibs i Baio 
1 | Sprayed 3 times....... 202 6 168 20 | 5 -— 
2 | Sprayed 6 times....... 1893 2 157 55 | 1 40 
Ou LINSprayedeien. ores .ban 143 6 119 10 | 5 ~_ 
4 | Sprayed 3 times....... 197 6 164 10 | 5 — 
5 | Sprayed 6 times....... 2034 7 169 35 | 5 50 
6G Unsprayed +. ivsizens} -4 148 8 123 20 | 6 40 
7 | Sprayed 3 times....... 196 5 163 20 | 4 10 
8 | Sprayed 6 times....... 187 7 155 50 | 5 50 
0 j..Lineprayed fA. . ef ea 167 5 139 10 | 4 10 
10 | Sprayed 3 times........ 173 ff (144 10 | 5 50 
11 | Sprayed 6 times....... 199 6 165 50 | 5 — 
12) \4Uinsprayede,y -sayatt..be | 143 6 119 10 | 5 — 
13 | Sprayed 3 times....... 166 f 138 20 | 3 20 
14 | Sprayed 6 times....... 212 5 176 40 | 4 10 
15.4 Unaprayed oo tues. oe = 156 8 130 — |6 40 
* Rows 290.4 feet long by three feet wide making the area of each row exactly 
one-fiftieth acre. 
Yield by series.—The five rows sprayed three times consti- 
tute Series I and the average yield of these rows makes the 
yield for Series I. The yields given for Series II and III 
have been computed in the same way. The yield by series is 
shown in the following table: 
