Spraying Experiments in Nebraska 
55 
after the falling of the petals prevented most of the infection. 
The fact that the Bordeaux spray applied July 2 was slightly more 
efficient than lime sulphur applied at the same time indicates that 
some infection occurred after that date. 
The first blotch spots were found on the fruit on July 3, about 
7 weeks after the petals had fallen from the trees. This would 
indicate that the infection occurred not more than 4 weeks after 
the petals fell. 
Table 34 — Brownville spray schedule 
Date 
Spray 
May 30 
Three-weeks 
Plat 1 
2 
3 
7 
LS-1.5-50 
Bx-3-4-50 
Bx-3-4-50 
Bx-3-4-50 
Blotch injury on windfalls and picked fruit 
Variety 
Plat 
Total 
fruit 
Blotch 
Per cent 
blotch 
Spray 
injury 
Per cent 
spray injury 
Ben Davis and Mis- 
1 
4,790 
473 
9.87 
49 
1.02 
souri Pippin, two 
2 
5,774 
298 
5.16 
40 
.69 
trees of each variety 
? 
4,638 
100 
2.16 
15 
.32 
to a row examined 
5,071 
127 
2.50 
2,132 
42.04 
check 
1,804 
437 
24.22 
At Brownville (table 34), the evidence indicates that the three- 
weeks spray controlled the greater part of the infection. Bordeaux 
used at this time was 31.8 per cent more efficient than lime sulphur. 
Bordeaux used for the petal-fall spray showed no advantage over 
lime sulphur, but on the other hand greatly injured a high per 
cent of the crop. The indications are that the heavy infection 
occurred soon after the three-weeks spray and that some infection 
occurred later in the season. 
EXPERIMENTS IN 1914 
Special stress was laid on determining the date and length of the 
infection period as well as methods of control. Observations were 
made in an unsprayed orchard near Lincoln and in the orchards 
where spraying was done. Spores were found issuing from the 
cankers in large numbers on June 5 at Beatrice and Wymore and 
on June 8 at Lincoln. Spores may have been freed before this 
time. As blotch cankers were not plentiful at Beatrice or Wymore 
it was impossible to secure definite data at these places. At 
