118 
Ernest S. Salmon. 
TABLE V. 
Infection-experiments with conidia of Sphaerotheca llumnli 
on Potentilla reptans. 
Rxper. 
No. 
Date. 
1 903. 
Species used ns Host. 
No. of 
leaves ino¬ 
culated. 
! 
No. of 
leaves 
infected. 
149a 
Aug. 31 
... Potentilla reptans 
(young potted plants) 
2 
2 
175a 
Sep. 9 
... M ... 
2 
2 
200a 
„ 15 
„ 
1 
1 
218a 
„ 21 
... ,, 
2 
2 
231a 
„ 27 
... M • • * 
3 
3 
149b 
Aug. 31 
Alcheinilla vulgaris 
(young potted plants) 
3 
0 
231 d 
Sep. 27 
... A. arvensis (seedlings) ... 
3 
0 
175b 
Q 
» 
Fragaria sp. (cult) 
1 
0 
231b 
n 27 
• • • 99 • • • 
3 
0 
200 b 
„ 15 
Spiraea Ulmaria 
1 
0 
149c 
Aug. 31 
... Agrimonia Eupatoria ... 
2 
0 
218b 
Sep. 21 
,, (seedlings) ... 
2 
0 
231c 
„ 27 
Poterium officinale 
3 
0 
Remarks. 
149a. September 7. The two inoculated leaves covered with 
patches of conidiophores with chains of ripe conidia ; controls free. 
September 17. Both leaves covered with densely powdery Oidium- 
patches; fungus spreading to control leaves. 
175a. September 23. Both leaflets covered with scattered 
conidiophores; controls free. September 25. Both leaflets with 
powdery Oidium -patches ; controls still free. October 5. Oidium- 
patches still powdery on the two leaflets. 
200a. September 25. Scattered conidiophores visible over 
the surface of the inoculated leaflet; controls free. September 29. 
Powdery Oidium -patches on the infected leaflet. 
218a. September 30. Virulent infection of both leaves, now 
covered with powdery Oidium -patches; controls free. October 5. 
The two leaves densely covered with very powdery 0/<7/;ow-patches; 
fungus spreading to controls. 
231a. October 5. The two leaves with scattered conidio¬ 
phores; controls free. October 7. The two leaves with powdery 
Oirfnow-patches. 
