September, 1955 FORSBERG: 
indicated that the planting stock carried 
some Fusarium; so all of the symptoms 
that developed in the new corms probably 
did not result from the inoculations. 
In the variety Picardy, five of the check 
plants died before reaching maturity and 
seven new corms had vascular discolora- 
tion. Fusarium was not isolated from any 
of these new corms. Curvularia sp. was 
isolated from four of them and Penicillium 
sp. was isolated from the other three. 
These two organisms appeared also in 
some isolations from corms in the inocu- 
lated series. 
In the variety Variation, vascular dis- 
coloration developed in one corm; four 
corms of the 29 in the checks had slight 
basal rot lesions. Isolations from four of 
these affected corms yielded Penicillium ; 
no organism was obtained from the fifth 
corm. 
All plants from noninoculated Mar- 
garet Fulton corms remained healthy and 
FusARIUM DISEASE OF GLADIOLUS 
489 
produced healthy daughter corms. Fusar- 
ium was recovered from diseased corms in 
the inoculated series 36 times in 52 at- 
tempts. 
Tests in 1953.—Varieties Dr. F. E. 
Bennett, Margaret Fulton, Spotlight, and 
Elizabeth the Queen were inoculated late 
in 1952 with 13 isolates of Fusarium. Size 
No. 4+ (three-fourths to 1 inch in diam- 
eter) corms of the variety Elizabeth the 
Queen and large cormels of the other 
three varieties were used in this test. 
‘Treating and planting was done December 
Z9, 1952. New corms were harvested 
June 5, 1953; they were cleaned and ex- 
amined 2 weeks later. 
In this trial, because no disease was 
found in the new corms produced in the 
noninoculated checks, and because only 
one Dr. F. E. Bennett and one Spotlight 
plant failed to live and produce new corms, 
it was assumed that the planting stock was 
practically free of disease. Cause of death 
Table 19.—Results of greenhouse tests on gladiolus variety Dr. F. E. Bennett inoculated 
with Fusarium, February, 1952; new corms were examined in August of the same year. 
isolations were attempted. 
Numser or New Corms OsraINnEeD 
PLANTS Fusarium 
IsoLATE DEVEL- B Vascular Basal Re- 
SEED Total | Healthy Roe Dis- Dry COVERED* 
ot : 
coloration Rot 
Brown rot 45-8........ 10 9 2 0) 7 0 3/8 
Brown rot 45-74....... 10 8 8 0 0 0 0/0 
Brown rot 47-1........ 9 0 0) 0) 0) 0 0/0 
Brown rot 47-12....... 8 0 0 0 0 0 0/0 
Brown rot 47-32....... 10 5 0 0 5 0 5/5 
Brown rot 49-8........ 10 10 4 0) 6 0 1/5 
Brown rot 50-7........ 10 8 6 0) 2, 0 YD) 
Brown rot 50-22....... 7 0 0 0 0 0 0/0 
Total 74 40 20 0 20 0 11/20 
Vascular 45-73......... 10 6 0) 0 6 0) 3/4 
Mascular46-3.. ..2).: 52: 10 1 0 0 1 0 1/1 
Wascular46-9) 0... .5..- 10 10 0 0 10 0 0/0 
Vascularia7-10) 0.0. .... 10 10 2 0 8 0 5/5 
Vascular 49-4... 2.2... 9 0 0) 0 0 0 0/0 
Vascular 49-23......... 10 10 7 1 2 0 1/1 
Vascular 50°6.......... 8 0 0 0 0 0 0/0 
Vascular 50-24......... 10 10 7 1 2 0 0/3 
Wasculari50-28........: 10 5 0 0 5 0 0/0 
TE GHZ LO ese ae 87 52 16 2 34 0 10/14 
Basal dry rot 49-20..... 10 4 1 0 3 0 1/2 
Basal dry rot 50-23..... 10 10 3 1 6 0 4/5 
Basal dry rot 50-26..... 10 10 6 0 4 0 3/5 
GTO GI ee 30 24 10 1 ils) 0 8/12 
CheclaiNowles i0.... 10 9 i! 0 2 0 1/3 
CheckeNos2s.cendic i. 10 10 7 0 3 0 1/3 
@hecksiNowSis. ooh ek as 10 10 9 0 1 0) 0/1 
NOTA Reh 30 29 23 0 6 0 Qi. 
*The numerator indicates the number of successful isolations, the denominator the number of corms from which 
