24 
WALTER SPURGEON BEACH 
own host alone spore-bearing bodies developed naturally under the ordinary- 
greenhouse environment. The infection of small shoots of H. tuberosus 
covered, out of doors, with a bell jar was relatively feeble. Numerous spots 
developed, but the author could not satisfy himself that they were entirely 
due to Septoria, on account of the scanty appearance of pycnidia, and 
because a Phyllosticta, apparently saprophytic however, often appeared 
when the leaves were placed in a moist chamber. 
Table 4 
Infections with Septoria helianthi Ell. &" Kell. from Helianthus grosseserratus 
No. Leaves 
Date 
Conditions 
Plants Inoculated 
Infected and 
Remarks 
' Inoculated 
1 
Sept. 16 
Julys 
Jan. 5 
Mar. 2 
g-b3 
g-b 3 
g-b 3 
g-b 3 
g-b 3 
g-b 3 
g-b 3 
g-b 3 
g-b 3 
f-b4 
f-b4 
f-b4 
f-b4 
g-b 4 
g-b 4 
g-b 4 
g-b 4 
g-b 4 
g-b 4 
g-b 4 
g-b 4 
g-b 4 
g-b 4 
Helianthus grosseserratus . 
Helianthus occidentalis . . . 
Helianthus rigidus 
Helianthus mollis 
Helianthus tuberosus 
Helianthus annuus 
Silphium integrifolium . . . 
Bidefis cernua 
Helianthus grosseserratus . 
Helianthus tuberosus 
Helianthus mollis 
Helianthus rigidus 
Silphium integrifolium . . . 
Helianthus rigidus 
Helianthus argyrophyllus . 
Helianthus cucumerifolius 
Helianthus grosseserratus . 
Helianthus calif ornicus . . . 
Helianthus annuus nanus 
fiore pleno 
Helianthus annuus double 
primrose queen 
Helianthus maximilianus . 
Coreopsis lanceolata 
Rudbeckia laciniata 
5/5 
0/6 
0/5 
0/5 
0/5 
3/8 
0/5 
0/20 
7/7 
4/10 
0/7 
o/io 
0/5 
plus 
4/20 
6/20 
plus 
plus 
plus 
plus 
o/io 
0/20 
o/io 
Check, leaves mature, 32 
spots. 
Leaves mature 
Seedlings, pycnidia in moist 
chamber, 10 spots 
Check, leaves young 
spots 
26 
spots 
Many spots, but few with 
pycnidia 
Leaves young 
Seedlings, only spots formed 
Seedlings, pycnidia in moist 
chamber 
As above 
Check, seedlings 
Seedlings, pycnidia in moist 
chamber 
As above 
As above 
Spores from Helianthus tuberosus 
July 24 
f-b4 
4/10 
Check, pycnidia and spores 
g-b 4 
Helianthus grosseserratus . . . 
0/5 
f-b4 
o/io 
f-b4 
o/io 
f-b4 
0/5 
f-b4 
Silphium integrifolium 
0/5 
Spores from Helianthus rigidus 
Sept. 18 
f-b5 
Helianthus grosseserratus . . . 
0/8 
No check, but spores germi- 
nated well in laboratory 
tests 
f-b5 
0/5 
