490 
of the two nonsurviving check plants was 
not determined. As the results of this test 
are considered more conclusive than those 
of the previous test, they are given in de- 
tail by isolates and varieties. 
Brown rot isolate 47-12 
Dr. F. E. Bennetr: Only 3 plants 
emerged ; none produced a new corm. 
Marcaret Futon: 8 plants emerged ; 
1 survived and produced a new corm, 
which had thin basal rot. 
SPOTLIGHT: 5 plants emerged; + sur- 
vived and produced new corms, 3 of which 
had much of the bases rotted, but the rot- 
ted tissue was very thin. There was some 
vascular streaking, but it was not general. 
One corm showed no symptoms. /usarium 
was recovered from all 3 affected corms. 
ELIZABETH THE QUEEN: 10 plants 
emerged; all survived and produced new 
corms. Four of the new corms were badly 
decomposed ; 6 had typical brown rot le- 
ItLinois NaTtuRAL History SURVEY BULLETIN 
Vol. 26, Art. 6 
sions. Of these 6 corms, 1 had numerous 
brown vascular strands; another had a 
single brown vascular strand in addition 
to the brown rot lesions. /usarium was re- 
covered from all 6 corms. 
Brown rot isolate 47-32 
Dr. F. E. BENNETT: 6 plants emerged; 
5 survived and produced new corms, all of 
which had core rot and brown vascular 
streaks. Jusarium was recovered from 
all 5 corms. 
MARGARET FuLtTon: 10 plants 
emerged; all survived and developed new 
corms. Two corms had thin basal rot le- 
sions; 8 showed no symptoms. Fusarium 
was not recovered from the affected corms. 
SPOTLIGHT: 5 plants emerged; 7 sur- 
vived and produced new corms, all of 
which had diffused basal lesions. There 
was no vascular discoloration. Cultures 
were made from 3 corms, and Fusarium 
was recovered from each corm. 
Table 20.—Results of greenhouse tests on gladiolus variety Margaret Fulton inoculated 
with Fusarium, February, 1952; new corms were examined in August of the same year. 
NumsBer or New Corms OBTAINED 
PLAnTs FusaRIUM 
ISOLATE DEVEL- B Vaseular Basal ReE- 
OPED | Total |Healthy| “po Dis- Dry COVERED* 
ot : 
coloration Rot 
Brown rot 45-8........ 10 10 10 0 0 0) 0/0 
Brown rot 45-74....... 10 10 9 0) 1 0 0/0 
Brown rot 47-1........ 10 5 0 0 5 2 4/5 
Brown rot 47-12........ 10 1 0 0 1 0 0/1 
Brown rot 47-32....... 10 10 6 0) 4 3 1/3 
Brown rot 49-8........ 10 10 8 0 2 0 1/3 
Brown rot 50-7........ 10 10 10 0 0 0 0/0 
Brown rot 50-22....... 10 | 4 1 1 2 0 1/2 
DOM. anes ee 80 60 44 1 15 5 7/14 
Vascular 45-73......... 10 10 10 0 0 0 0/0 
Vascular'46-30- 2.00... 10 9 3 0 6 0) 3/4 
Vascular 46-9.......... 10 10 9 0) 1 0 1/1 
Vascular 47-10......... 10 10 9 0 1 0 1/1 
Vascular 49-4.......... 10 2 0 0 » 1 1/2 
Vascular 49-23......... 10 10 10 0 0 0 0/0 
Vascular 50-6.......... 10 10 1 0 9 0 6/9 
Vascular 50-24......... 10 10 7 0 3 0 0/4 
Vascular 50-28......... 10 10 0 (0) 10 0 10/10 
110) 7) SU pete mae a 90 81 49 0 32 1 22/31 
Basal dry rot 49-20..... 10 10 0 0 10 0) 5/5 
Basal dry rot 50-23..... 10 10 8 0 2 0 2/2 
Basal dry rot 50-26..... 10 10 10 0) 0 0 0/0 
TOI eee. 30 30 18 0 12 0 7/7 
Check: Noss yo ene 10 10 10 0 0 0 0/0 
nec INO! 2 tes eile 10 10 10 0 0) 0 0/0 
Check Not S asst i 10 10 10 0 0 0 0/0 
OM ea eos 30 30 30 0 0 0 | 0/0 
*The numerator indicates the number of successful isolations, the denominator the number of corms from which 
isolations were attempted. 
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