384 Wormald . — ‘ Brown Rot ’ Diseases of Fruit Trees. 
All the strains readily produced on the infected plums the characteristic 
‘ Brown Rot ’ and numerous pustules. A slight difference could be detected 
in the productivity of pustules in the two forms in a similar experiment 
started a little later in the season, viz. Aug. 1, when the fruit was approach- 
ing maturity, and the detailed results of this experiment are here tabulated. 
The pustules are described as ‘ numerous ’, * many or ‘ few ’ in the following 
sense : 
Pustules numerous — occurring scattered over the whole surface and 
often also becoming confluent to form continuous zones or irregular 
patches. 
Pustules many — scattered over the whole affected surface ; continuous 
patches absent or few and small. 
Pustules few — isolated and scattered over a portion (half or less) of the 
discoloured area. 
Two trees (variety Victoria) were reserved for the experiment, ten 
plums being inoculated on each tree as shown in the table. 
The method of inoculation adopted was similar to that used in 
Expt. 1. 
TREE I. 
Strains used ^ 
in the inocula- | 
tions ^ 
( Aug. 1). 
M. cinerea 1 
f. mail. 
Strain from a 
‘ Brown Rot ’ 
Canker on an 
apple tree. 
Aug. 6 . 
Aug. 13. 
Aug. 28. 
Half the sur- Whole surface discoloured 
face affected ; and wrinkled, plum 
pustules few. shrunken ; pustules many ; 
two other plums in contact 
with it were discoloured 
over their whole surface and 
bore a few pustules. 
The three plums 
were shrunken 
and wrinkled 
and bore many 
pustules. 
2 
Half the sur- 
face affected ; 
pustules ab- 
sent. 
Whole surface wrinkled, 
plum shrunken ; pustules 
many; in contact with in- 
oculated plum were one 
wholly discoloured and 
another with § of the surface 
affected, both with a few 
pustules. 
The plum pri- 
marily inocu- 
lated had in- 
fected 4 others ; 
all were shrunk- 
en and bore 
many pustules. 
3 
The rot had 
extended 1-5- 
2 cm. from 
point of inocu- 
lation ; pus- 
tules none. 
Whole surface affected ; 
pustules many ; another 
plum, infected from con- 
tagion, showed a rot ex- 
tending 1-1.5 cm. from the 
point of contact. 
Both were 
shrunken and 
bore many 
pustules. 
4 The rot had Whole surface affected ; Fallen, 
extended 1.3- pustules many. 
i-8 cm.; pus- 
tules none. 
5 
Half the sur- Whole surface affected ; 
face affected ; pustules few. 
pustules none. 
Much shrunken 
and bearing 
many pustules. 
