| Material Information
||Programs for controlling the gladiolus corm disease caused by Fusarium Oxysporum F. SP. Gladioli
||Gulf Coast Experiment Station mimeo report
||2 leaves : ; 28 cm.
||Magie, R. O ( Robert Ogden ), 1906-
Gulf Coast Experiment Station (Bradenton, Fla.)
||Gulf Coast Experiment Station
||Place of Publication:
||Gladiolus -- Diseases and pests -- Control -- Florida ( lcsh )
||government publication (state, provincial, terriorial, dependent) ( marcgt )
non-fiction ( marcgt )
||Statement of Responsibility:
||Florida Historical Agriculture and Rural Life
The publications in this collection do
not reflect current scientific knowledge
or recommendations. These texts
represent the historic publishing
record of the Institute for Food and
Agricultural Sciences and should be
used only to trace the historic work of
the Institute and its staff. Current IFAS
research may be found on the
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site maintained by the Florida
Cooperative Extension Service.
Copyright 2005, Board of Trustees, University
;1 L HUME LIBRARY
(7/-/ GULF COAST EXPERIMENT STATION
Bradenton, Florida PR 7 1971
Mimeo Report GCS71-1 January, 1971
PROGRAMS FOR CONTROLLING THE GLADIOLUS CORM DI \ Aus l W of Florida
FUSARIUM OXYSPORUM F. SP. GLADI
R. 0. Magie
A. A program to test large corms for disease before they are planted.
1. Treat corms with carbon dioxide as follows to induce them to rot quickly
if they have latent Fusarium infections.
a) Take a representative sample of any lot or stock which you intend
to plant or purchase. Fifty corms per sample would be enough for
a fair test.
b) Put corms in a 15-gal. plastic drum with a tight lid. Place a few
wet paper towels over corms.
c) For each 7 gallons of free air space in drum, place one ounce of dry
ice in saucer over corms.
d) Place lid on loosely, then seal drum after dry ice has had time to
sublime into gaseous carbon dioxide.
e) Remove corms after 4 or 5 days at a 70-80F temperature range, or wait
up to 9 days if temperatures are much lower.
f) Hold them in plastic bags at 75-850 F until rotting develops, or plant
them in moist soil at summer temperatures. Within a few weeks, large
corms with no apparent infections will begin to rot.
2. Carbon dioxide treatment can be very useful in examining corm samples
for disease content, so that only the healthiest stocks may be purchased
or saved to plant. Elimination of the infected corms before planting
can also be a useful disease control measure. A successful program
of corm certification utilizing the carbon dioxide treatment as a tool
in detecting infected corms is a possibility.
B. A program to reduce or eliminate Fusarium infection in a stock of corms.
1. Treat the whole stock of large corms with carbon dioxide as above.
2. Dip undamaged corms in Benlate as shown below, and plant them in fumi-
gated soil or in soil new to gladiolus.
3. Save cormels from the healthiest plants.
4. Treat the dormant cormels with hot water to which Benlate is added
5. Grow cormels on clean or fumigated soil and repeat program on new corms.
C. A program to reduce or eliminate Fusarium infection from cormels produced
in temperate climates as well as warmer areas.
1. Hold cormels at 75-800 F. for two months after digging.
2. Treat them for 30 minutes in heated water at 1330 F to which is added
1 1/2 Ib of Benlate 50W/100 gal or 1 oz/4 gal. Cool by draining cormels
in thin layers on screens, not by pouring into water which would remove
some fungicide. Also, treat a sample of the cormels at 1350 with the
Benlate. Benlate may make the higher temperature safe for your con-
3. Benlate improves the hot-water treatment in two ways: Provides systemic
fungicidal action and allows use of a higher temperature. Apparently
benzimidazoles, including Benlate, protect proteins from degradation
by the heat.
4. This program may also be applied to small corms with the waiting period
reduced to 6 weeks and the temperature lowered to 131-1330 F.
D. Corm treatments for Fusarium control.
1. Benlate 50W as a 15-30 minute dip at 1 1/2 lb/100 gallons immediately
after corms are cleaned.
2. Mertect 160 dissolved with ammonium alum, heated to 1600 and used as an
instantaneous dip or spray on newly cleaned corms. Use 1 1/2 lb Mertect
160 with 5 or 6 Ib ammonium alum per 100 gal. (In a cold dip, 8 lb alum
would be needed to dissolve the Mertect).
3. Dowicide B at 2 3/4 lb/100 gal as a 15 minute dip immediately after
digging and cleaning large corms.
4. Benlate 50W diluted to a 10-20% dust.
5. Hertect 160 diluted to a 10-20% dust. A pre-plant treatment of corms
generally would not be required where the above treatments were applied
at cleaning time.
6. Horsodren or any other mercury fungicide labeled for use on gladiolus
corms may be used as a pre-plant dip. The newer mercury fungicides con-
tain methyl mercury which is more hazardous for humans than the ethyl
mercury compounds formerly available.
Use all chemicals with appropriate cautions, be sure to read the label, and dis-
pose of chemicals safely. Ask your County Agent.