Everglades Station Mimeo Report 59-2 M
Comparison of Air-Blast and Boom Sprayer
on Control of Early Blight in Celery
D. S. Harrison and P. L. Thayer
Materials and Methods:
Plot layout is a 3x3 Latin square design. Each of the 9 plots has an area
80 ft. wide x 100 ft. long or 0.183 acre. Rows are spaced on 28-inch intervals.
Utah 57 celery was transplanted on February 15. Fertilizer was broadcast applied
and disked in 2 weeks prior to transplanting, at rates of 3000#/A of 0-16-8 4
0.3% MnO 4 0.3% B203 4 500# S/A.
Application of Sprays:
Two sprayers were
Treatment #1
Treatment 2
Treatment #3
used in application of fungicide:
- Check (no spray application)
- Conventional boom type sprayer
- *Air-Blast sprayer
Sprays were applied on a 4 to 5 day schedule, commencing February 25
ing through May 4, 1959. Rates of application were as follows:
Dates
2/25 '-3716/59
3/24 4/6/59
1I It
4/10/59
4/15 5/4/59
"i 11
Treatment No.
2
3
2
3
2
3
2
3
Material
**Nabam '4 ZnSo4
it It
Rates (Gal./A),
b5
65
70
65
130
65
130
90
* Air-Blast Sprayer furnished by F. E. Myers & Bros. Company, Ashland, Ohio.
** 2 qt. 4 3/4 Ib./lO0 gal. water. The
applied per acre with the air-blast,
Rates, Spraying Time:
Excluding time for refilling, the
swath using only the right side of the I
acres per hour, using both sides. The 1
a total spraying time of 10 acres per h
same amounts of active ingredients were
as was with the boom type sprayer.
Air Blast Sprayer covered 17 rows in one
machine. This would be approximately 27
boom sprayer covered 10 rows per swath or
our, excluding refilling.
Disease incidence:
Early blight ratings were made on April 1, 15 and 25 using Horsfall and
Barratt's scale as3followb: 1 i .-o disease, 2 = 0-3 of plant with disease
symptoms, 3 = 3-6%, 4 = 6-12%, 5 = 12-25%, 6 = 25-50, 7 = 50-75%, 8 = 75-87%,
9 = 87-94%, 10-= 94-97%, 11 : 97-100%, and 12 s 100%. Disease ratings were made
on alternate rows, except in treatment 2 where some rows were cut out for spray
alleys, and are shown in the following table:
and runn-
Pressure
300
100
300
100
300
100
300
100
ioo
May 6, 1959
Row Number
North to South
April
Treatment
1
1
No.*
14
April 15
Treatment No.
1 2 1
April 25
Treatment No.
1 2 3
2.0 1.8
2.2 1.7
2.0 1.8
1.8
2.2 2.3
2.2 2.5
2.3 2.7
2.0 3.2
2.2 3.5
3.5
3.3
2.2 2.7
2.0 2.3
2.2
1.8
1.8 1.8
2.0 1.8
6.2
6.2
6.2
6.2
6.2
6.2
6.2
6.2
6.2
6.2
6.2
6.2
6.2
6.2
6.2
6.2
6.2
2.8 3.0
3.0 2.8
3.0 3.2
3.3
3.2 3.7
3.0 4.3
3.0 4.7
3.2 4.8
3.0 4.8
5.0
4.5
3.0 4.0
3.0 3.7
3.5
3.2
2.8 3.0
3.0 3.2
3.0 4.0
3.0 3.5
3.0 3.8
4.3
3.0 5.0
3.2 5.3
3.2 5.7
3.5 5.8
3.0 6.2
6.0
5.5
3.3 5.2
3.5 5.0
4.7
4.2
3.2 3.8
2.2 4.0
* Treatment
Treatment
Treatment
#1
#2
#3
Check
Boom Type Sprayer
Air Blast Sprayer
EES 59-24
250 copies
Belle Glade, Florida
2.8
3.2
3.2
3.8
3.8
4.2
4.2
4.2
4.3
4.5
4.2
4.2
4.3
4.0
4.2
4.2
4.0
1 2 I I III
|