132 REPORT OF THE BOTANICAL, DEPARTMENT OF THE 
sprayed rows. Ultimately, the sprayed rows as well as the un- 
sprayed ones were considerably injured by late blight, but it 
was plain that the unsprayed rows suffered most. The alterna- 
tion of the brown unsprayed strips with the green sprayed 
strips gave the experiment field a striped appearance. In the 
latter part of July flea beetles, also, became an important factor 
in the experiment. | 
At digging time the potatoes from the middle two rows of 
each plat were sorted into marketable tubers and culls and then 
weighed. The yields are shown in the following table: 
TABLE VIII.—SHoOWING YIELDS IN THE EXPERIMENT AT RIVERHEAD. 





YIELD OF TWO ROWS. YIELD PER ACRE. 
PEAT: Treatment. - 
Marketable. Culls. Marketable. Culls. 
Lbs. Lbs. Bu. lbs. | Bu. lbs. 
Uh... Ae eae Parag Check: 3.4. 08e<: 810 79 | 156 36 | 15 16 
Drain iee. calen Sprayed. ...243u4 998 TE. AV 192 ey fe eal oo 
Se 1 ig Sage aa CCK Steere 966 89 | 186 46. |, 47 12 
Oe ae Spraved faa «a4 1a i 48 | 220 55 9 ik? 
Daversa vets CCK ir ceeeesannete 1,036 62 | 200 Vi ek 59 
Osa reat: 2 SpPrayed. css 1,250 54 | 241 40 10 26 
Nea ots CCK ar te 5 eee 1,078 80 | 208 Phe e 28 
SSP erat Stabe sweine Spraved ¢.uuyveaen 1,230 60 | 237 48 | 11 38 
eric bie: eck.2 Fo fade} 14102 84 | 213 16 ie 
TORS ee ens Spravedasuiek. oe, 1,328 71 | 256 44 | 138 43 
La tts Pe 6CK Vicsuteth ot 1,054 86 | 203 46 | 16 37 
Lire Se & SPLAaVved se pees 1,278 64 | 247 Dale 22 

Yield, 12 sprayed rows, 7,225 Ibs. == 232 bu. 48 lbs. per acre. 
Yield, 12 unsprayed rows, 6.046 lbs.=194 bu. 49 lbs. per acre. 
Gain, 38 bu. marketable tubers per acre. 
There was no loss from rot. The greater yield of the sprayed 
plats was due to the prolongation of growth through spraying. 
POTATO TROUBLES IN NEW YORK IN 1906. 
Early blight, Alternaria solani, was more abundant in 1906 than | 
at any other time since these experiments were commenced in 
1902. In allparts of the State some fields suffered quite severely, 
but-the majority were only slightly, if at all, affected. In the 
latter part of the season many fields, including the ten-year ex- 
periment at Geneva, were much affected with a trouble which, 
by some, was mistaken for early blight. The margins and tips 
of the leaves became brown and dry as in the disease known as 
tip-burn. Lacking opportunity for a study of this disease we 
are unable to say positively what may have been the nature 
