Ernest S. Salmon. 
116 
65f. August 5. A well-grown patch of conidiophores on the 
one leaf. August 7. As on August 5; controls free. August 13. 
Fungus beginning to die away. 
TABLE III. 
Infection-experiments with conidia of E. Graminis on Poa pratensis. 
Exper. 
No. 
Date. 
1903 . 
Species used as Host. 
No. of 
leaves ino¬ 
culated. 
No. of 
leaves 
infected. 
55a 
July 17 
Poa pratensis (young plants in pots) 
3 
3 
88a 
Aug. 9 
>» 5 J 
3 
3 
198a 
Sep. 15 
„ (seedlings 6 weeks old) 
2 
2 
55b 
July 17 
P. annua (young plants in pots) 
3 
0 
198b 
Sep. 15 
„ (seedlings 6 weeks old) 
2 
1 
88 h 
Aug. 9 
P. nemoralis 
3 
1 
1902. 
67c 
Sep. 10 
Festuca elatior var. pratensis 
4 
0 
67d 
„ 10 
F. arundinacea 
4 
0 
67e 
., 10 
F. heterophylla 
5 
0 
67f 
„ 10 
Poa annua 
4 
0 
67g 
„ 10 
Folium perenne 
4 
0 
67r 
.. io 
L. temulentum 
3 
0 
67 h 
„ 10 
Dactylis glomerata 
4 
0 
67 i 
„ 10 
Phleum pratense 
4 
0 
67 k 
„ 10 
Alopecurus pratensis 
4 
0 
671 
„ 10 
A vena sativa 
3 
0 
67m 
„ 10 
Hordeum vulgare 
3 
0 
67n 
„ 10 
Triticum vulgare 
3 
0 
67o 
„ 10 
Secale cereale 
3 
0 
67 p 
„ 10 
Agropyron repens 
3 
0 
67q 
„ 10 
• • • ft ... 
2 
0 
Remarks. 
55a. July 27. All three leaves infected, and hearing several 
patches of Oidium, some ripe and powdery with little masses of 
conidia. July 31. The three leaves each with numerous well- 
developed more or less powdery O/rfm/Aj-patches ; controls free. 
August 2. Powdery patches of Oidium on all three leaves ; controls 
still free. 
88a. August 20. Numerous very powdery Oidium -patches on 
all the three leaves ; controls free. August 26. Fungus spread to 
several controls. September 3. Fungus spread to all the controls. 
October 7. All the leaves in the pot white with almost continuous 
patches of Oidium. 
198a. September 21. The infected inoculated leaves with 
numerous vigorous flecks of mycelium hearing groups of young 
conidiophores. September 25. One leaf covered continuously for 
a distance of 4-5 cm. with snow-white Oidium -patches more or less 
powdery with masses of ripe conidia; the other leaf with numerous 
scattered O/dnw-patches. September 28. Fungus spreading to 
controls. October 4. Fungus spread to all the controls. 
