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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
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Copyright 2005, Board of Trustees, University
Gulf Coast Experiment Station Mimeo Report/68-1
JAN 2 1233]
REVISED RECOMMENDATIONS FOR CONTROLLING GLADIOLUS DISEASES IN FLORIDA
R. o. Magie j .AS. U of o
Gulf Coast Experiment StatioQn_ ____
For flower fields. August through November: maneb, zineb, Manzate D, or
Dithane M-45 once each week, or twice each week if Curvularia disease is
present. For each 100 gal. use 2 Ibs of the wettable powder, or 1 1/2 Ibs
for twice-a-week spraying.
December through April: maneb, Manzate D, or Dithane M-45 twice each week
after rains. When Stemphylium leaf spot is present, substitute Dyrene at
1 1/2 lbs/100 gal for one maneb-type spray per week on susceptible
May through July: zineb, maneb, Manzate D, or Dithane M-45 once each week,
or twice-a-week if Curvularia or Botrytis disease is present.
June through September: During rainy season spray once or twice each week
with Morsodren at 4 oz/100 gal to control bacterial neck rot. Also spray
immediately after cutting flowers or topping.
For planting stocks and cormel plantings. For each 100 gallons of spray
mixture use 1 1/2 lbs of maneb, Manzate D, or Dithane M-45 twice each week
and also after rains. Do not use maneb when the spray may not dry on the
leaves before nightfall or when leaves are wet. Add insecticides as needed,
but use only half to two-thirds the usual dosage of insecticides when
spraying small cormel plants. Do not spray when plants are wet.
After topping flowers, spray immediately with Morsodren at 4 oz/100 gal.
Treatment for Cut Spikes to control Botrytis gray mold.
At the first sign of Botrytis infection, begin to use Tutane solution on
the cut flower heads. Tutane is a 26% solution of 2-aminobutane (carbonat-
ed) which is non-staining and non-toxic to petals when used as recommended.
If the spikes are well sprayed or dipped in the diluted Tutane, they will
be protected against further development of Botrytis gray mold through
several days of storage and delivery.
Tutane is diluted 4 ounces per gallon of water for spraying. Do not add
wetting agents or any pesticide. Spray on the spikes with about 200 pounds
pressure so that the buds are thoroughly covered, especially the lower
flowers where the disease starts. For dipping the spike heads, use 1 1/2
ounces of Tutane per gallon of water. Field spraying of gladiolus flowers
with Tutane would be unnecessary where maneb and pre-mixed maneb plus zinc
sprays are used as recommended.
Cormel and Planting Stock Treatments
Treat all dormant cormels and planting stocks for 30 minutes in hot water
at the highest safe temperature determined by actual sample treatments
(See Bulletin 664A). After the treated cormels are quickly cooled in
running water, dip them in a suspension of Phaltan, 10 lbs/100 gal. Then
pour them out in shallow layers and dry them with heat and air circulation
or in the sun.
Preplanting treatment with Ceresan L at 4 pints/100 gal for 30 min. is
suggested for all cormels and planting stocks treated in hot water. The
treatment should follow the water soaking of cormels.
Note: Any cormels or planting stocks not treated for 30 minutes in water at
1320 F or higher should be treated as follows after the usual water soak.
Soak 30 minutes in 4 pints Ceresan L per 100 gallons*, then spray Botran
in open furrow before planting as recommended below.
Corm Treatments for Flower Production. (For corm stocks with more than
average disease content, add 2 to 4 oz Triton X-100 or Vatsol OT per 100
gal of dip and/or soak 1 to 2 hours in order to improve disease control.)
For large-size corms that are cleaned when harvested:
Phaltan dust, 12.5% active, applied immediately after cleaning;
or Phaltan 50W, 8 lb/100 gal*, 15 minute dip, better when applied a day
after cleaning. Then treat diseased corms again before planting, using
the 4 pint rate of Ceresan L* or 2 pints of Morsodren per 100 gal.
For corms, including planting stocks, cleaned after curing, then graded
Dip promptly in Morsodren at 1 1/2 pints/100 gal for 15 minutes. No
further treatment before planting is usually necessary.
When a dust is preferred for planting stock, use 10 or 12 1/2% Phaltan
while cleaning scar is still moist.
For corms to be dipped one or more days before planting:
Ceresan L, 4 pints/100 gal,*
or Morsodren, 2 pints/100 gal. These are 15 minute dips for average corm
stocks. Longer or shorter dips are recommended for more or less disease
to be controlled, because over-treatment reduces flower production.
For corms to be dipped on the day of planting in moist soil:
Ceresan L, 5 pints/100 gal*
or Morsodren, 2 1/2 pints/100 gal. 15 minute dips for average corm stocks.
To control Stromatinia neck rot in small corm plantings and to reduce
contamination of soil with the fungus, spray into open furrow before
planting two pounds of Botran 50W per 1000 feet of row and stir in
furrow with narrow tool.
Granules of parathion may be applied over corms to stimulate growth and to
control insects, including wireworms. Use between 2 and 3 pounds of the
10% granules per 1000 feet of furrow.
To control rootknot nematodes carried in corms and cormels and to improve
plant growth, parathion may be added to the dip treatment if all safety
measures are carried out, including the holding of treated corms in shed for 1
week before placing in cold storage or confined space; also delaying planting
for 2 days if treated at that time. Use emulsifiable parathion with solvent,
xylene range (ES), either 1 pint of 4E or 1/2 pint 8E formulation per 100 gal.
Do not use parathion unless safety measures employed are checked and approved
by County Agricultural Agent.
Jan. 9, 1968