270 REPORT OF THE DEPARTMENT OF BOTANY 
VOLUNTEER EXPERIMENTS. 
The details of 24 tests made by growers in 1907 and reported to 
the Station are shown in Table XVIII, page 269. 
SUMMARY OF VOLUNTEER EXPERIMENTS, 1904-1907. 
The following table shows the results obtained in the volunteer 
experiments during the past four years: 
TasLE XIX.—SHowi1nc RESULTS oF VOLUNTEER EXPERIMENTS, 1904-1907. 
a ES SE AT TR ES RSS ETRE SRY SESS STESS Sf 



Average] 
Average market price 
YEAR Number of | Total area | gain peracre| per bushel 
experiments. | sprayed. due to of potatoes 
spraying. at digging 
time. 
A. Bu. ibs: Cts. 
1904. ee ae. t eetoiare o cake sickate dete > cas 41 364 58 28 - 43.5 
LOO erase escha Sort aac ancho Serene eee eae 50 407 59 32 57.0 
1906237. 85 Bd Se See th aia ares 62 598 53 6 44.5 
EL OO 7 cated terccualets Cho cinas ro cerece ee ares 24 264 30 28 58.0 
Average gain for 4 years (177 experiments) 50% bu. per acre. 
POTATO TROUBLES IN NEW YORK IN 1907. 
Owing to dry weather in midsummer there was very little late 
blight (Phytophthora) anywhere in the State. In some localities 
there was a light attack late in the season resulting in some loss 
from rot. Flea beetles were unusually abundant and because of 
the dry weather their attacks were very injurious to the plants 
causing the leaves to turn brown and dry up. There was also much 
tip burn due to dry weather alone. The chief troubles were flea 
beetles and dry weather. In many cases these troubles were mis- 
taken for blight. 
DIRECTIONS: FORsSPRAYING: 
The observations made in 1907 tend to confirm us in the opinion 
that potatoes should be sprayed five or six times during the season 
regardless of weather conditions. It is a mistake to discontinue 
spraying on account of dry weather. We see no reason for alter- 
ing the recommendations for spraying given in Bulletin No. 290, 
page 320. 
