BIOLOGIC SPECIALIZATION IN THE GENUS SEPTORIA 
Table i 
Injections with Septoria polygonorum Desm. 
No. of 
Check In- 
Date 
Conditions 
Plants Inoculated 
Leaves In- 
fected and 
No. of 
Spots 
fections on 
Original 
Inoculated 
Host 
Spores from Polygonum pennsylvanicum 
f-b 2 
f-b 2 
f-b 3 
f-b 3 
f-b 4 
f-b 4 
f-b 4 
shaded 
f-b 3 
f-bo 
shaded 
shaded 
f-b 4 
shaded 
shaded 
Polygonum persicaria . 
Polygonum lapathifolium . 
Polygonum orientale. 
Polygonum erectum . 
Polygonum convolvulus 
Polygonum hydropiper . 
Polygonum acre 
Polygonum scandens . . . 
Polygonum amphihium . 
12/16 
11/20 
8/12 
10/15 
41/63 
3/10 
5/5 
8/15 
6/6 
o/io 
o/ii 
0/21 
0/8 
0/45 
0/12 
0/20 
0/32 
0/25 
0/7 
many 
45 
26 
34 
many 
28 
8/10 
6/6 
6/6 
6/6 
4/5 
)Urfp 
plus 
plus 
8/10 
Spores from Polygonum persicaric 
July 10 
Oct. 3 
shaded 
g-b 5 
Polygonum pennsylvanicum 
o/io 
5/5 
many 
10/15 
5/15 
Sept. 9 
Sept. 20 
f-b 4 
f-b 4 
Polygonum orientale 
7/10 
7/7 
many 
many 
10/10 
July 10 
Mar. 3 
shaded 
g-b 3 
0/20 
0/5 
10/15 
0/25 
July 10 
Sept. 28 
shaded 
f-b 4 
Polygonum hydropiper 
0/30 
0/25 
10/15 
plus 
0/55 
July 10 
f-b 3 
Polygonum erectum 
0/25 
10/15 
Sept. 7 
Sept. 21 
shaded 
f-b 4 
Polygonum acre 
o/io 
0/20 
0/30 
Spores from Polygonum lapathifolium 
Sept. II 
f-b 3 
2/5 
15 
Sept. 21 
Mar. 10 
f-b 3 
g-b 3 
6/12 
3/4 
15 
13 
8/8 
9/16 
28 
