| Material Information
||Revised recommendations on gladiolus corm dips for controlling fusarium, curvularia, and stromatinia diseases
||Gulf Coast 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 -- Florida ( lcsh )
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
Electronic Data Information Source
site maintained by the Florida
Cooperative Extension Service.
Copyright 2005, Board of Trustees, University
Gulf Coast Station Mimeo Report 62-1
REVISED RECOMMENDATIONS ON GLADIOLUS CORM DIPS FOR
CONTROLLING FUSARIUM, CURVULARIA, AND STROMATINIA DISEASES
R. O. Magie
Gulf Coast Experiment Station
There have been several changes in gladiolus bulb dipping practices
in recent years: 1) A tendency to treat bulbs before storage instead of
before planting; 2) The addition of parathion to the fungicidal dip; and
3) The use of Elcide 73.
Most growers prefer the post-harvest or pre-storage dips to the pre-
planting dip. Dipping in captain immediately after digging is highly
recommended for controlling Fusarium and Curvularia diseases but captain
is not effective enough against Stromatinia (Sclerotinia dry rot) disease.
Dowicide B is effective against all three diseases, but must be used at
reduced concentrations when bulbs are soft or freshly harvested. Fungicides
such as Elcide which contain mercury are not recommended for the pre-
storage treatments because mercury vapor could accumulate and become a
hazard in cold storage rooms that are not adequately ventilated.
The addition of parathion in the bulb dip is highly recommended to
control root-knot nematodes carried on the bulbs. For the pre-storage
dip, parathion-treated bulbs should be held at least one week in open
sheds before they are put in cold storage. If used in the pre-planting
dip, bulbs should be held in shed for three or four days before planting
so that the danger of handling wet parathion-treated bulbs is reduced.
Since Ceresan-treated bulbs must be planted promptly to avoid injury,
parathion should not be added to N. I. Ceresan unless all workers who
handle the bulbs wear rubber gloves and rubber aprons.
Our recommendation for the Elcide 73 dip is changed from 2 pints
to 3 pints per 100 gallons in order to obtain better control of bulb
rot. Flower production has been as good at the higher rate as it was
at the lower concentration. Some growers will continue to use Elcide
at the 2 pint rate because it gave satisfactory results.
In recent years, a small but increasing proportion of Florida's
flowering-size bulbs were cleaned immediately after digging and then
dipped in captain or Dowicide B. This method is highly recommended if
the bulbs are treated in Elcide 73 before planting; however, the after-
digging treatment alone may be sufficient to control Fusarium and
Stromatinia if the stock was grown from hot-water-treated bulblets.
How to use parathion: Only the emulsifiable concentrate formulations of
parathion are recommended, either the 4 lb. or 8 lb. per gal. concen-
trate. Add 1 pint of the former or 1/2 pint of the latter to each
100 gallons of the pre-storage dip or the pre-planting dip. Add the
same amount each day that the dip is reused. If there is a choice,
add the parathion in the pre-storage dip so that the corms are not
handled after treatment. Workers must wear rubber aprons and wash
hands well before eating or smoking. If shoes become wet, rubber
boots should be worn. Bulbs should be held in parathion dip for at
least 15 minutes.
After-digging treatment: Hold bulbs about 30 minutes in captain (Orthocide)
50W at 12 lb/100 gal. or captain 75W at 8 lb/100. For a short dip,
use Dowicide B at 1 lb/100 for 5 minutes. Treat bulbs with Elcide 73
before planting unless they were grown from hot-water-certified
Pre-storage treatment: Captan as above or Dowicide B at 1 lb/100 for
30 minutes, or Dowicide B at 2 lb/100 for 5 minutes. Add 2 table-
spoons Triton X-100 per 100 gallons of Dowicide B solution.
Pre-planting treatment: Use Elcide 73 or Dowicide B. If parathion is
added, dip at least 3 or 4 days before planting, so that they may
be handled with more safety. Use 3 pints Elcide 73 per 100 gallons.
To use solution for maximum of 3 days, fortify solution as follows:
after 50,000 bulbs are dipped per 100 gallons, add one pint of Elcide 73
per 100 gal. and make up to the original volume with plain water.
If a second lot of 50,000 bulbs is treated, add another pint and make
up to volume before treating any more bulbs.
To use Dowicide B, add 3 lb. per 100 gal. for 15-30 minute
dip; or use 4 lb. per 100 gal. for a 5-10 minute dip. Add 2 table-
spoons Triton X-100 per 100 gal. for the shorter dip periods.
Bulblets should be treated in hot water as recommended by the
Gulf Coast Station. After the usual cold storage period, bulblets
should also be dipped for 5 to 15 minutes in Elcide 73, 3 pints per
100 gallons. This is done a few days before planting, but after
the usual soaking in cool water to soften the husks.