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Group Title: Research Report - University of Florida Central Florida Research and Education Center ; 86-09
Title: Evaluation of various insecticides for the control of fall armyworm in early to mid-whorl sweet corn, 1984
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Permanent Link: http://ufdc.ufl.edu/UF00075863/00001
 Material Information
Title: Evaluation of various insecticides for the control of fall armyworm in early to mid-whorl sweet corn, 1984
Series Title: Research Report - University of Florida Central Florida Research and Education Center ; 86-09
Physical Description: Book
Creator: Leibee, Gary L.
Publisher: University of Florida, Central Florida Research and Education Center
Publication Date: 1985
 Record Information
Bibliographic ID: UF00075863
Volume ID: VID00001
Source Institution: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: oclc - 122375063

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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
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University of Florida
CENTRAL FLORIDA RESEARCH AND EDUCATION CENTER
Sanford, Florida

Research Report SAN 86-09 September 1985

EVALUATION OF VARIOUS INSECTICIDES FOR THE CONTROL OF
FALL ARMYWORM IN EARLY TO MID-WHORL SWEET CORN, 1984

G. L. Leibee


'Silver Queen' sweet corn was planted on September 10, 1984, into
Myakka fine sand at the CFREC in Sanford, FL. Counter 15G at 2 lb
ai/acre was incorporated at planting in a 10-inch band for nematode and
soil insect control. Lasso 15G at 3 lb ai/acre was applied in a 10-inch
band at planting for weed control. Each plot consisted of a single 50
ft. row with 7-inch plant spacing. The rows were spaced 5 feet apart.
Treatments were applied in a randomized complete block replicated 5
times. Blocks were separated by 25-ft weed-free alleyways. Sprays were
applied with a tractor mounted CO2-pressurized sprayer. Three nozzles
(D3-45) were used per row; one overhead and one drop on each side. The
delivery rate was 50 gpa with a boom pressure of about 50 psi and a
speed of 3 mph. Treatments were applied on September 26, October 1, 5,
8, and 11, 1984. The Orthene 5% bait was applied over-the-top in a
15-inch band with a shaker-can. Twenty plants per plot were rated for
damage on October 15, 1984, as follows: O=no damage; 1=etching present
on outer leaves, no whorl damage; 2=damage evident on some whorl leaves;
3=all whorl leaves damaged.

The results are presented as the percentage of the plants showing
damage to the whorl (a rating of 2 or 3). The infestation of fall
armyworm, Spodoptera frugiperda, was very heavy, making this a rigorous
test of efficacy. The large amount of damage in the corn treated with
MK 936 0.15EC at 0.02 is inconsistent with other studies and cannot be
explained. All the other treatments provided significant (P<0.05)
control over the untreated check. The treatments showed a wide range of
activity in this trial and the large amount of variation between plots
resulted in a low level of significance between large differences in the
amounts of damage. In general, of the materials which are currently
available to the growers, the following gave acceptable results:
Lannate, Parathion, Larvin, and Bolstar. Fenvalerate and permethrin did
poorly, which is consistent with previous trials. The results from the
chlorpyrifos treatments were erratic, but the low rate of Lorsban 50W
did give an acceptable amount of control. No phytotoxicity was
observed.

Central Science
Library

OCT 23 1987

University of Florida













Insecticide and rate % of plants with whorl damage
(lb ai/acre) (% with a rating of 2 or 3)*

Untreated check 91.0 a
Bay FCR 1272 2.0 EC 0.022 15.0 c-1
Bay FCR 1272 2.0 EC 0.044 12.0 d-1
MK 936 0.15 EC 0.005 38.0 be
MK 936 0.15 EC 0.02 93.0 a
L 653,649 0.15 EC 0.005 32.0 bed
L 653,649 0.15 EC 0.02 21.0 e-k
Lorsban 4 E 0.5 36.0 bed
Lorsban 4 E 1.0 30.0 b-e
Lorsban 50 W 0.5 7.0 g-1
Lorsban 50 W 1.0 21.0 b-j
XRM 4764 4 E 0.5 13.0 c-i
Orthene 75 SP 0.5 31.0 b-f
Orthene 75 SP 1.0 28.6 b-f
Monitor 4 E 0.5 19.0 c-1
Monitor 4 E 1.0 14.0 c-i
Orthene 5% bait 1.0 49.0 b
MO 070616 1.92 EC 0.0112 21.0 b-j
MO 070616 1.92 EC 0.0225 33.0 b-e
SDO 43775 2.4 EC 0.05 29.0 b-f
SDO 43775 2.4 EC 1.0 30.0 b-h
Ammo 2.5 EC 0.04 27.0 b-g
Ammo 2.5 EC 0.05 21.0 e-j
Ammo 2.5 EC 0.08 14.0 c-i
PP 321 1 EC 0.01 6.0 jkl
PP 321 1 EC 0.015 6.0 h-i
PP 321 1 EC 0.020 6.0 jkl
PP 321 1 EC 0.025 2.0 1
Pay-off 2.5 EC 0.04 30.0 b-f
Pounce 3.2 EC 0.1 23.0 b-j
Pounce 3.2 EC 0.2 26.0 b-i
Larvin 3.2 F 0.45 3.0 kl
Larvin 3.2 F 0.75 12.0 g-i
Bolstar 6 EC 0.5 5.0 i-1
Bolstar 6 EC 1.0 15.0 c-i
Lannate 1.8 L 0.23 18.0 c-k
Lannate 1.8 L 0.45 10.0 e-i
Lannate 1.8 L 0.90 11.0 f-1
Parathion 15 WP 0.25 12.0 d-l


*Means follows by the same letter are not significantly
different at the 0.05 level by DMRT. ANOVA was performed
on transformed (arc sine) data.




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