September, 1955 ForRSBERG: 
lower than those for isolate +7-3 until the 
thirty-fourth day. 
In fig. 18B, isolate 46-12 was inter- 
mediate-raised, and isolate 47-8 was in- 
termediate-appressed. Isolate 46-12 was 
more virulent in laboratory tests. In this 
case the pH readings for the more virulent 
isolate were lower than those for the 
milder isolate from the beginning until the 
fifty-eighth day. 
In these experiments no consistent rela- 
tions between culture types, pH changes, 
or degrees of virulence were observed. In 
this respect, the gladiolus Fusarium ap- 
pears to differ from the tomato Fusarium. 
FuUSARIUM DISEASE OF GLADIOLUS 
479 
MORPHOLOGY 
A complete morphological study of all 
the isolates from the vascular, brown rot, 
and basal dry rot forms of the gladiolus 
Fusarium disease was not attempted. Some 
of the isolates produced the typically 2- to 
5-septate macrospores rather consistently, 
but many isolates produced only the single- 
celled type. In some isolates, septate spores 
were very abundant in the original cul- 
tures from diseased gladiolus corms, but, 
after one or two transfers, only single- 
celled spores could be found. Spores seemed 
to be produced more abundantly on Well- 
Table 13—Measurements of conidia produced by six isolates of the gladiolus Fusarium 
on Wellman’s agar. 
IsoLATE AND Type 
SEASE ForM 
Di or ConipIA 
Isolate 49-15 
O=septaten re Meee el te 
IESE DEAte mer racer 
Vascular 
ASEMEATCH Sy nes, Shea sw 
D=SED CALE eae ee eee 
Vascular Isolate 50-27 
DaseMtatenn Aru fiers 
S-septateas-. er en ee. 
ASEM EATER Mpa ears Tare 
SEsep tates. cme tes. eins 
Isolate 45-74 
O-septate..s..4.5-meretn ee 
leseptate mem ccmoe na or 
PEseptate crunk. ckste es ie 
S-Septatenn acter 4c 
Brown rot 
A-CeDLAte eer eloen ate oka 
S=septateanianen ee Mon 
Isolate 50-25 
Ozseptateyase ce sweooee cers. 
MESEMEALG oh sista ee eee 
DEseptatess.@ sao s2e ane 
S=SEPEALEL Ase aan 
APSE NCA’ ais. xian roy Bee aor 
Saseptatenet yt -aaae crt: © 
Isolate 49-20 
Orceptatenaer. .cer-s rca: 
l=ceptaten eqs) acre 
DESEPtAten maa yay se n.4oe 
S-Septatehwrs. elds Ae esc 
Brown rot 
Basal dry rot 
Isolate 50-26 
Ozcep tater eievur titre: 
leseptate stem os ceieee .- 
Deseptatereae cacti mee: 
G-septaternr ce a./ysepsy. Metaes 
ASSeptaterit, orc: serch ite 
Sesepite fe ee ae we 
Basal dry rot 
Mean, Microns Rance, Microns 
TPs Bare Spo Sr xe 84a 
16.0 x 4.0 6.9-27.6 x 2.8-5.5 
26.2 x 4.1 16.6-34.5 x 3.4-4.8 
S2 oxo) 23.5-45.5 x 3.44.1 
45.3 x 3.9 37.3-56.6 x 2.8-4.1 
Seth se Goal Only 1 spore 
8.8 x 3.0 5.5-12.4 x 2.8-4.1 
Weed se SES 11. 7-235 x 2.8-4.8 
23.2 x 4.0 193-3723 x 2,851.5 
SEG se Gh 24.8-44.2 x 4.1-5.5 
AD xcA ol 34.5-48.3 x 4.1-4.1 
46.4 x 4.5 44.2-53.8 x 4.1-5.5 
Del x6 DoS 6.9-15.2 x 2.8-4.1 
1K ae ae ae 9.7-24.8 x 2.8-4.1 
24.5 x 4.0 17.9-31.7 x 2.8-4.8 
30.2 x 4.1 15.2-40.0 x 2.8-5.5 
Saab 52 34.5-34.5 x 4.8-5.5 
None = 
8.9 x 3.0 5.5-13.8 x 2.1-4.1 
US elie Os 11.0-19.3 x 2.8-4.8 
NOR GAZ0 15.2-24.8 x 2.8-5.5 
Si 7x3 20.7-44.2 x 4.1-5.5 
BOM xXEaeS 37.3-44.2 x 4.1-5.5 
44.2 x 4.1 Only 1 spore 
9.1 x 3:4 6.9-15.2 x 2.8-4.8 
16.3 x 4.0 9.7-29.0 x 2.84.1 
DIS aKa e 13. 8-31. 7 x33.4-55 
29.4 x 4.4 22 1-37.3 x 4.1-5.5 
29.0 x 4.1 Only 1 spore 
None = 
9.6 x 4.0 4.1-22.1 x 2.8-5.5 
WO 422 12.4-23.5 x 3.44.8 
PDISS GE V9 298 ORS aan D 
eS 5.2 24.8-40.0 x 4.1-5.5 
SPIELE SS Be? 31 .7-33.1 x 4.8=5:..5 
None = 
