Spraying Experiments in Nebraska 39 
Table 24 — Brownville spray schedule 
Date 
Spray 
Cluster-bud 
1 May 5 
Petal-fall 
May 30 
3-weeks 
Plat 1 
2 
3...., 
4 1 
LS-1 . 5-50 
LS-1 . 5-50 
LS-1 . 5-50 
Bx-3-4-50 
LS-1 . 5-50 
Bx-3-4-50 
LS-1 . 5-50 
Bx-3-4-50 
Scab injury on windfalls and picked fruit 
Variety 
Plat 
Total 
fruit 
Scab 
! 
Per cent 
Spray 
injury 
Per cent 
Ben Davis and Mis- 
souri Pippin in equal 
number, except in 
plat 3 which con- 
s'* sts of Arkansas ex- 
clusively. 
1 
2 
3 
4 
j check 
4,790 
4,638 
2,538 
5,071 
1,804 
53 
37 
17 
58 
312 
1.11 
.80 
.67 
1.14 
17.29 
49 
15 
809 
2,132 
1.02 
.32 
31.87 
42.04 
At Brownville (table 24), the petal-fall spray, together with 
the spray following, proved 93.5 per cent efficient on the control 
of scab where lime sulphur was used for both applications. 
Where Bordeaux was used for the second spray (plat 2) the effi- 
ciency was 95.4 per cent. Where Bordeaux was used for both 
applications (plat 4) the efficiency showed slightly less than in 
the case of either plat 1 or 2. The spray injury on this plat was 
so severe as to bar Bordeaux from use as a fungicide for the 
petal-fall spray. Plat 3 consisted of the variety Arkansas, 
alone. On this plat two applications proved to have a slightly 
higher efficiency in controlling scab than in any of the other 
plats, but here again the spray injury was very severe. The 
weather during and following the second application was very 
hot and dry and the burning was no doubt due to the rapid oxi- 
dation of some of the sulphur compounds in the spray. The 
variety Arkansas seemed to be especially susceptible to this 
injury. The foliage of all the plats where lime sulphur was used 
for the second application showed considerable burning, while 
the foliage on the Bordeaux plats was dark green and free from 
injury. The foliage was not injured on plat 4.. This orchard 
had never been cultivated or sprayed. 
