|
HISTORIC NOTE
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
(EDIS)
site maintained by the Florida
Cooperative Extension Service.
Copyright 2005, Board of Trustees, University
of Florida
&0 University of Florida
CENTRAL FLORIDA RESEARCH AND EDUCATION CENTER
Sanford, Florida
Research Report SAN 8-04 November 1988
APHID CONTROL ON COLLARD II, SUMMER 1988
Gary L. Leibee and Kenneth E. Savage
'Georgia Southern' collard was seeded on July 7, 1988, into
Myakka fine sand at the University of Florida's Central Florida
Research and Education Center in Sanford. A plot consisted of one
50' row with app. 4" plant spacing. Each treatment row was
separated by at least two unsprayed rows; row spacing was 30".
Nemacur 15G 2 lb ai/acre was applied preplant in 15" band for
nematode control. Treatments were replicated in four randomized
complete blocks separated by 20' weed-free alleys. Sprays were
applied with a tractor-mounted, compressed air sprayer. Three
nozzles (D2-25) were used per row; one overhead and one drop on
each side. The delivery rate was 50 gpa with a boom pressure of
about 45 psi and a speed of 2 mph. Application dates were August
25 and 30, September 8, 14, 21, and 29, 1988. The following FMC
experimental compounds and rates per acre were tested: F7900 0.783
EC at 0.025, 0.050, and 0.100 lb ai, F7900 0.417 AF at 0.025,
0.050, and 0.100 lb ai, F7869 0.417 EC at 0.025, 0.050, and 0.100
lb ai, F6308 0.833 EC at 0.050, 0.100, and 0.150 lb ai, F7123 F at
2.0 pts of formulation, F7123 WP at 1.0 lb of formulation, and
Trebon 0.834 EC at 0.10 lb ai. The standard insecticide treatments
were Dipel 2X (Abbot) at 0.50 lb of formulation, Pounce 3.2 EC (FMC
Corp.) at 0.1 lb ai, Lannate 1.8 L (E. I. duPont deNemours & Co.,
Inc.) at 0.9 lb ai, Pydrin 2.4 EC (E. I. duPont deNemours & Co.,
Inc.) at 0.2 lb ai, and Orthene 75 SP (Chevron) at 1.0 lb ai. A
wetting agent, X-77 (Chevron Chemical Co.), was used at the rate
of 2.4 ml/gallon. Plants were sampled for insects on September 9
and 26, and October 3, 1988. Twenty (September 9) or 10 (September
26 and October 3) plants per plot were randomly selected and
sampled by removing one leaf of intermediate age from each plant.
The leaves from each plot were placed in plastic bags and
transported to the laboratory where they were placed into berlese
funnels and heat extracted for 24 hr. Samples were collected into
70% ETOH. All the aphids in the September 9 samples were counted.
All the aphids were counted in the September 26 and October 3
samples if there were 500 or less in the sample, otherwise, the
number of aphids was estimated volumetrically. Plant weight was
determined for each plot on October 7, 1988, by harvesting 10 feet
of row, weighing the harvest, and dividing the weight by the number
of plants harvested. Only three replicates were used to determine
plant weight due to a scarcity of plants in one block.
The collards were heavily infested with cabbage aphids,
Brevicoryne brassicae (Linn.). There were essentially no
lepidopterous pests present in the study. The most efficacious
experimental insecticide and the only one to show practical control
value was F7869 0.833 EC at 0.100 lb ai. F6308 0.833 EC at 0.150
lb ai, and Trebon at 0.1 lb ai reduced the number of aphids, but
the amount of control was not considered practical. None of the
experimental insecticides were as effective as Pounce, Pydrin,
Lannate, and Orthene. The Bacillus thurinQiensis treatments showed
no aphid control as expected. No problems with formulation were
encountered and no phytotoxicity was observed.
Insecticide and No. of aphids/leaf' Plant wt.'
rate (lb ai/acre) --------------------------- (lb)
Sept. 9 Sept. 26 Oct. 3 Oct. 7
Untreated check
F7900
F7900
F7900
F7900
F7900
F7900
F7869
F7869
F7869
F6308
F6308
F6308
.783EC
.783EC
.783EC
.417AF
.417AF
.417AF
.417EC
.417EC
.417EC
.833EC
.833EC
.833EC
.025
.050
.100
.025
.050
.100
.025
.050
.100
.050
.100
.150
F7123 F 2.0 pts2
F7123 WP 1.0 lb2
Trebon .834EC .10
Dipel 2X .50 lb2
Pounce 3.2EC .1
Pounce 2.4EC .2
Lannate 1.8L .9
Orthpen 75 RP 1.0
57.6 abc
43.9 a-e
56.2 ab
72.0 a
55.1 a-d
54.8 a-d
44.3 a-e
26.1 a-f
12.2 c-f
2.4 f
15.8 b-f
29.3 a-f
12.0 b-f
40.0 a-e
51.7 a-e
9.5 def
61.2 a-d
7.3 ef
70.1 abc
106.8 ab
82.5 ab
103.5 ab
83.5 ab
106.0 ab
131.9 ab
88.9 ab
37.6 bcd
8.9 d
143.4 a
84.2 ab
37.1 bcd
53.3 bcd
120.9 ab
38.4 bcd
69.3 abc
17.8 cd
56.5 ab
58.0 ab
38.6 abc
44.6 abc
50.5 abc
43.2 abc
30.0 bcd
43.8 abc
23.6 bcd
31.6 bcd
90.2 a
30.5 bcd
64.3 ab
32.3 bcd
21.1 b-e
20.2 c-f
33.4 bcd
5.2 def
0.2 f
1.8 ef
0-1 f
.037
.042
.035
.038
.048
.049
.047
.093
.056
.123
.046
.064
f
f
f
f
ef
ef
ef
b-f
def
abc
f
c-f
.199 a
.058 def
.051 ef
.077 b-f
.050 ef
.105 b-e
.130 abc
.110 bcd
.140 ab
IMeans within each column followed by the same letter are not
significantly different at the 0.05 level by DMRT. Analyses of
variance were performed on transformed data (sqrt(X + 0.5)).
2Amount of formulation used.
|
RSS
HIDE
