RECOFI.IMDED OR SUGGFETED CONTROL PROGRAMS FOR
DISEASES OF SOME VEGETABLE CROPS IN THE EVERGLADES
R. S. Cox
These recanmendations are brought up to date on the
.basis of experiments and observations made during
the past year. It is suggested that growers and
shippers consult their County Agricultural Agents
'for regulations concerning the use of streptomycin
'in order to meet the tolerances established by the
Pure Food and Drug Administration,
EVERGLADES STATION MIKEO REPORT 57-7
Belle Glade, Florida
May 9, 1957
RECO1EENDED OR SUGGESTED CONTROL PROCRPTS FOR
DISEASES OF SO~E VEGETABLE CROPS IN THE EVERGLADES
R. S. COX
1. Fumigate beds (4' x 300') before seeding with methyl bromide (12-24
Ibs./bed) or chloropicrin (1-2 gals./bed).
2. Maintain vigorously growing plants at all times by means of proper
fertilization and irrigation. A rapidly growing celery plant can withstand
disease better than a weak, deficient one.
3. Avoid over-exposing seedlings to the sun during the "hardening off"
process, especially before mid-September.
4. Avoid shearing plants too close to the ground no closer than 3 to 4
inches during hot weather.
5. Adopt a disease prevention spray program using an appropriate combina-
tion of materials as follows:
A. Zineb (2/00) plus thiram (thylate) (1/100) plus streptomycin
B, Chloranil (Spergon) (4/100) plus zineb (2/100) and streptomycin
C. Neutral Copper (4/100) plus zineb (2100) plus streptomycin
Apply 10 gallons to the bed, Mixtures B and C may cause some leaf
injury when applied during hot weather that occurs before mid-September.
6. Spray every 5 days to 3 times weekly daring the rainy season. Later,
spray once weekly.
CORN: (Note: this recommendation is based on work carried out jointly
S- ) D. S, Harrison, Assistant Agricultural Engineer.)
1. Materials and Rates:
A. Maneb (/10lOO).
B. Nabam plus zinc sulfate 2 qts.-3/t lbs./100
C. Zineb (2/100).
2. How Often To Spray: Spray twice weekly during periods of rainy weather.
During periods less favorable to disease development spray every 5-7 days.
3, Coverage: Good coverage is essential. Use 2 nozzles directly over the
row and 1 to 3 dropped to either side depending on height of corn. A
pressure of 300 p.s.i. should be maintained.
4. Gallonage: Adjust ground speed and orifice size so as to ensure 80-160
gallons per acre output.
1. Downy Mildew: Spray once every 5-7 days with zineb or maneb. Good
coverage is essential. This entails proper placement of nozzles over the
row and adequate gallonage (up to 150/A.) output.
2. Jelly Butt: (This recommendation is based on joint work with D. H.
Harrison, Assistant Agricultural Engineer and J. P. Winfree, Assistant Soils
A. Maintain a 24-30 inch water table after the seedlings are established.
B. Paint butts with a solution of streptomycin (50 ppm) after cutting.
C. Ship under refrigeration.
1. Bacterial spot:
1). Neutral copper (4 lbs.100) plus streptomycin
Note: streptomycin is sold under several trade names:
2). Agrimycin 500 (5 lbs./l00). Note: This material contains the
equivalent of 4 lbs. of neutral copper and 100 ppm. of streptomycin,
B. Gallonage: Apply 2-5 gals. per acre when first true leaves appear.
Increase gallonage up to 100 as plant size increases.
C. When To Spray: Spray every 5-7 days depending on the weather. Under
severe conditions spray twice weekly.
2. Frogeye leafspot: The same program used
control for frogeye under most conditions.
spray with Zerlate (2/100), zineb (2/100) or
for bacterial spot provides adequate
If the disease gets out of hand
maneb (1/100) on a 5-7 day