54 Nebraska Agricultural Exp. Station, Research Bui. 10 
darker in color. The advancing margin is irregular and jagged 
and has a fringed appearance. Where the spots are numerous 
they often coalesce and form large blotches which may cover half 
or more of the fruit. The fungus kills only the superficial cells so 
that the continued growth of the tissue beneath results in a crack- 
ing of the diseased areas. These cracks tho usually small may 
girdle the fruit and extend to the core. The general effect is to 
mar the appearance of the fruit and render it unfit for packing. 
INFECTION 
According to Scott and Rorer the cankers in which the fungus 
passes the winter are the chief source of infection. Spores are 
produced during the warm, moist weather of spring, which are 
readily carried by the rain and other agencies to the young fruit, 
leaves, and twigs, producing the first spring outbreak of the dis- 
ease. The primary and most extensive infection begins 4 to 5 
weeks after the petals have fallen, altho some infection probably 
occurs during the remainder of the growing season. 
EXPERIMENTS IN 1913 
No special attention was given to blotch when the schedules 
for 1913 were outlined, but notes were taken on time and amounts 
of infection and the degree of control afforded by each schedule. 
Table 33 — Wymore spray schedule 
Date 
April 21 
May 5 
May 22 
July 2 
Spray 
Cluster-bud 
Petal-fall 
Three-weeks 
Second-brood 
Plat 1 
LS-1 . 5-50 
Bx-3-4-50 
Bx-3-4-50 
Bx-3-4-50 
2 
LS-1 . 5-50 
LS-1 . 5-50 
Bx-3-4-50 
Bx-3-4-50 
3 
LS-1 . 5-50 
LS-1 . 5-50 
LS-1 . 5-50 
LS-1 . 5-50 
4 
Bx-3-4-50 
LS-1 . 5-50 
LS-1 . 5-50 
Bx-3-4-50 
Blotch injury on luindfalls and picked fruit 
Total 
Per cent 
Spray 
Per cent 
Variety 
Plat 
fruit 
Blotch 
blotch 
injury 
spray injury 
Two Ben Davis and 
1 
1,863 
4 
.21 
49 
2.63 
two Missouri Pippin 
2 
3,182 
24 
.75 
192 
6.03 
trees in each plat 
3 
2,022 
393 
19.43 
152 
7.52 
4 
3,405 
553 
16.24 
216 
6.34 
check 
2,203 
551 
25.01 
At Wymore (table 33), the efficiency of the lime sulphur 
schedule (plat 3) was only 23 per cent, while that of the Bordeaux 
schedule (plat 1) was 99 per cent, and of plat 2 was 97 per cent. 
This indicates that the application of Bordeaux made three weeks 
