Wormald. — ‘ Brown Rot' Diseases of Fruit Trees . 391 
Strain. Spur. 
1 
May 14. 
May 18. 
May 2 1. 
A 2 i 
a. 
Styles brown to base. 
Brown to base of pedicel ; 
Both flowers dead ; 
stamens and calyx lobes 
leaves beginning to 
b. 
brown. 
wilt. 
Ditto 
Stamens and calyx lobes 
brown and withered. 
2 
a. 
Ditto 
Both flowers brown and 
Whole inflorescence 
withered to the base of 
dead ; flowers brown, 
b. 
Ditto 
pedicels. 
withered, and recurved ; 
leaves brown and 
curled. 
3 
a. 
Ditto 
Both flowers .brown and 
withered. The other 
Ditto 
b. 
Ditto 
flowers on this spur and 
the leaves at base were 
just beginning to wilt. 
A 3 1 
a. 
Two styles with 
Both flowers had brown 
Both flowers brown and 
brown stigmas only, 
withered stamens. 
withered to base of 
the others brown to 
base. 
pedicel. 
b. 
All the five styles 
brown to base. 
2 
a. 
Styles brown for 1-4 
Both flowers brown to 
Whole inflorescence 
mm. 
base of pedicels. 
dead; flowers and leaves 
brown and withered. 
b. 
Styles brown to base. 
3 
a. 
Two styles with 
Both flowers 1 withered ; 
Ditto 
brown stigmas only, 
the others brown for 
stamens and calyx brown. 
1-4 mm. 
b. 
Styles brown to base. 
Controls. 
Flowers not inocu- 
The rest of the flowers 
On the rest of the tree 
lated on these and on 
other spurs of the 
same tree had, gener- 
ally, brown stigmas 
only, but a few 
showed a slight 
browning of the styles 
also. 
had brown styles, but the 
stamens were upright, 
with white filaments, and 
the calyx lobes were green 
and spreading. 
the flowers at this time 
were just ‘ setting ’ into 
fruit. 
On May 25 the two flowers of spur No. 1 inoculated with strain A 3 
had fallen ; the spur itself was not affected and one of the non-inoculated 
flowers was ‘ setting ’ into fruit. The fungus had by this time advanced 
some distance into the tissues of the other infected spurs, as distinctly 
shown in those cases where the spur was branched and bore two inflores- 
cences, one of which bore inoculated flowers ; the non-inoculated umbel 
and the accompanying leaves were withered, thus indicating that the 
transpiration current had been interrupted at its junction with the main 
axis of the spur, which therefore must have been invaded by the fungus 
