Gulf Coast Experiment Station Mimeo Report 6-1
GLADIOLUS DISEASE CONTROL MEASURES FOR 1965-66
R. 0. Magie
Gulf Coast Experiment Station
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 gallons use 2 Ibs of the wettable powder, or 1 1/2 Ibs for twice-a-week
December through April: maneb, Manzate D, or Dithane M-45 twice each week; also
after rains. When Stemphylium leaf spot is present, substitute Dyrene at 1 1/2
lbs/100 gals for one carbamate spray per week on leaf spot-susceptible sorts.
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.
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 night-
fall or when leaves are wet. Add insecticides as needed, but use only half to
two-thirds the usual dosage of insecticide when spraying small cormel plants.
Treatments for Cut Spikes
At the first sign of Botrytis infection in the field, begin to use Tutane solution
on the flower heads. Tutane is a 26% solution of 2-aminobutane carbonated 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 well protected against
Botrytis gray mold through several days of storage and delivery. This protection
is best when the spikes are treated in the packing house and packed while wet.
Spikes wet with rain can be treated and shipped promptly.
Tutane is diluted 4 ounces per gallon of water for spraying. Do not add wetting
agents or any other 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 2 ounces of Tutane per gallon of
water. Field spraying of gladiolus flowers with Tutane would usually be unnecessary
where maneb and similar carbamate sprays are used as recommended.
Cormel and Planting Stock Treatments
Treatment of all dormant cormels and planting stocks for 30 minutes in hot water at
the highest safe temperature determined by actual sample treatments. The most ef-
fective temperature is that which kills 10 to 20 percent of the cormels. 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.
Preplanting treatment with Elcide 73 at 2 pints/100 gal or with Ceresan L at 4 pints/
100 gal for 30 min. for all cormels and planting stocks hot water treated .
Note: Any cormels or planting stocks not treated for 30 minutes in water at 1300 F or
higher should be treated as follows: Soak 30 minutes in 5 pints Ceresan L plus 1
pint parathion EC4 (or 1/2 pint EC8) per 100 gallons, then spray Botran in open fur-
row before planting as recommended below.
Corm Treatments for Flower Production (15-20 minute dips)
For corms that are cleaned when harvested:
Dowicide B at 2 lbs/100 gal plus parathion1
Or, for corms from Stromatinia-infested soils,
Dowicide B, 2 Ibs plus either Botran 50W or Thylate at 6 lbs/100 gal.
Parathion1 and Plyac may be added.
Or, Morsodren at 2 pints/100 gal.
For corms cleaned after curing, then graded for size:
Dust immediately with Spergon plus Botran or captain plus Botran.
Use 15 percent of active ingredient for each material.
Or, dip in Dowicide B, 3 lbs/100 gal plus parathion1
Or, dip in Morsodren at 2 1/2 pints/100 gallons.
For corms to be dipped one or two days before planting2:
Dowicide B, 4 lbs/100 gal plus parathion or
Ceresan L, 4 pints/100 gal plus parathion1, or
Morsodren, 2 pints/100 gal.
For corms to be dipped on the day of planting in moist soil2:
Dowicide B, 6 lbs/100 gal plus parathion1 or
Ceresan L, 5 pints/100 gal plus parathion or
Morsodren, 2 1/2 pints/100 gal, or
Elcide 73, 3 pints/100 gal.
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 Bo-
tran SOW per 1000 feet of row and stir in furrow with narrow tool. Wireworm con-
trol material may be applied at same time.
Iparathion emulsifiable concentrate, 4 lbs active per gallon, used as a 15 minute
dip at 1 pint/100 gal. Some formulations of emulsifiable parathion are not com-
patible with some of the wettable powders including Botran.
2Parathion may be omitted from the preplanting dip if used in a pre-storage dip.
CAUTION -- All pesticides are dangerous, especially parathion. Checklist for users
1. Always read the label before using.
2. Always store in original containers.
3. Keep out of reacn of children, pets, and irresponsible people.
4. Wear mask and protective clothing when label so directs.
5. Wash contaminated clothing before re-use.
6. Avoid smoking while using pesticide.
7. Avoid spilling.
8. Wash hands after using.
9. Cover food and water containers around areas to be sprayed or dusted.
10. Dispose of empty containers safely.
Nov. 23, 1965