382 Wormald. — f Brown Rot ’ Diseases of Fruit Trees, 
in which inoculations were made simultaneously with the two species on 
plums in close proximity and also on opposite sides of the same plum. 
Experiment i. 
'Monilia fructigena, strain isolated from a plum. 
Strains used-! Monilia cinerea , strain isolated from a ‘Wither Tip ’ twig of 
a plum tree. 
Plums (variety Victoria) growing in the open were numbered and 
labelled as follows : 
1, 2, and 3 were each a pair of plums at the same node ; one of each 
pair was inoculated with M. fructigena , the other with M. cinerea. 4, 5, 
and 6 were single plums, each inoculated on one side with M . fructigena, 
and on the other side with M. cinerea. In the accompanying table the 
plum or side inoculated with the former is indicated by f and with the 
latter by c. 
The inoculations were made on July 17, 1917, by making, in each 
case, a single puncture through the skin with a sterile needle and placing 
conidia from a pure culture in the wound. 
Six plums , three 
No. of mm. through 
inoculated with M. 
tv hie h rot had ex- 
fructigena , three with 
tended from point of 
M. cinerea. 
inoculation by July 20. 
1/ 
5-7 
1 c 
5-7 
2/ 
8-9 
2 c 
6-8 
3/ 
5-8 
0 c 
4-6 
Three plums , each 
inoculated on one side 
with M. fructigena, 
on the other with 
M. cinerea. 
4 / 
9- 12 ) 
c 
6-9 5 
5 / 
8-9 } 
c 
5-7 ) 
6/ 
9-10 ) 
c 
5-6 \ 
Result on Jtily 26. 
The whole 
yellow pustules 
the 
fruit - stalk 
surface was 
were present ; 
was 
brown for 
discoloured ; 
3 mm. 
V 
numerous 
grey pustules 
„ 4 mm. 
yy 
yellow pustules 
>> 
„ 3 mm. 
yy 
grey 
>> 
,, 12 mm. 
yy 
yellow ,, 
,, 3 mm. 
y y 
grey 
yy 
,, 3 mm. 
The two fungi had met in a plane approximately 
midway between the two points of inoculation ; 
M. fructigena had produced fairly numerous yellow 
pustules, M. cinerea numerous grey ones ; the 
stalk was brown for 8 mm. 
As in No. 4, but stalk brown for 3 mm. 
As in No. 4, but stalk brown for 12 mm. 
The discoloration of the plums was a dull purple brown with both 
species ; on the whole, the distance from the point of inoculation reached 
by M. fructigena after three days was a little greater than that attained 
