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Group Title: Budworm control on sweet corn
Title: Budworm control on sweet corn. 1981
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Permanent Link: http://ufdc.ufl.edu/UF00075813/00001
 Material Information
Title: Budworm control on sweet corn. 1981
Series Title: Budworm control on sweet corn.
Translated Title: Research Report - University of Florida Central Florida Research and Education Center ; 85-4 ( English )
Physical Description: Serial
Language: English
Creator: Leibee, G. L.
Publisher: University of Florida, Central Florida Research and Education Center
Publication Date: 1981
 Record Information
Bibliographic ID: UF00075813
Volume ID: VID00001
Source Institution: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: oclc - 144607564

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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
of Florida








c ^ HUME LIBRARY
S-gl University of Florida
CENTRAL FLORIDA RESEARCH AND EDUCATION CEN~E Ibo
Sanford, Florida
Research Report SAN 85-4 I.F.A.S.Sdtd beof RRf4da

BUDWORM CONTROL ON SWEET CORN, 1981

G. L. Leibee

'Silver Queen' sweet corn was planted October 5 in Myakka fine sand on
the University of Florida's Agricultural Research and Education Center in
Sanford. Furadan 10G 2 lb ai/acre and Lasso 15G 3 lb ai/acre were incorporated
at planting time in a 15" band for nematode and weed control, respectively.
A plot consisted of one 50' row with 12" plant spacing. Plots were separated
by two untreated rows (row spacing was 30"). Treatments were replicated in
five randomized complete blocks separated by 10' weed-free alleys. Sprays
were applied with a CO2 pressurized sprayer mounted on an Allis-Chalmers model
G tractor. Three nozzles were used per row; one overhead (TX 24) and one
drop (TX 12) on each side. The delivery rate was 50 gpa with a boom pressure
of about 40 psi and a speed of 3 mph. Sprays were applied October 27,
November 4, 12, and 18. Twenty plants per plot were rated for damage on
November 19 as follows: 0Ono damage; 1=etching only (evidence of foliar
feeding by newly hatched larvae); 2=light bud damage; 3=severe bud damage;
S and 4=bud completely destroyed. Damage ratings were taken when the plants
were 12 to 18" tall; the stage considered most susceptable to bud destruction
by fall armyworm, Spodoptera frugiperda (J. E. Smith). Only the percentage
of plants showing ratings of 3 and 4 were included in the table since the
lower ratings were not considered a threat to the plant.

The infestation level was considered heavy. All rates of Ambush, Ammo,
and Cymbush, Lannate at .50 lb, Larvin at .75 lb, and Monitor at 1.0 Ib
ai/acre were very effective in stopping severe bud damage. Lannate at .25
Ib, Orthene at 1.0 Ib, and U-56295 at .675 lb ai/acre were fairly effective
in stopping severe bud damage. Significant (P < .05) rate responses occurred
with Lannate, Larvin, Monitor, Orthene, and U-56295. The addition of Coax
at 2 Ib/acre significantly (P < .05) reduced the efficacy of Lannate at .125
lb ai/acre (Lannate at .25 lb ai/acre is the lowest label rate for sweet corn).
The efficacy of Monitor and Orthene was not significantly (P > .05) changed
by the addition of X-77. No phytotoxicity was observed.









Percentage of Percentage of
Insecticide and Damage plants with bud plants with bud
Ib ai/acre rating* severely damaged* destroyed*

Untreated check 3.54 a 44.0 a 55.0 a
Cymbush 3EC .04 .96 hi 0.0 g 0.0 g
Cymbush 3EC .06 .66 i 1.0 fg 0.0 g
Cymbush 3EC .10 .59 1 0.0 g 0.0 g
Ammo 2.5EC .06 .81 i 1.2 fg 0.0 g
Ammo 2.5EC .075 .65 i 1.2 fg 0.0 g

U-56295 85WP .45 2.17 de 21.0 bc 8.0 cd
U-56295 85WP .675 1.79 efg 9.4 def 5.0 d-g
Larvin 4.18F .45 1.94 efg 12.2 cde 2.2 efg
Larvin 4.18F .75 1.03 hi 0.0 g 0.0 g
Lannate 1.8L .125 2.49 c 31.0 ab 12.0 c
Lannate 1.8L .25 1.86 efg 13.0 cde 2.0 efg

Lannate 1.8L .50 1.53 gh 5.0 efg 0.0 g
Coax 2 lbs. 3.53 a 43.0 a 55.0 a
Lannate 1.8L .125 + Coax 2 Ibs 2.93 b 42.0 a 26.2 b
Orthene 75SP .50 2.16 de 25.0 abc 4.0 def
Orthene 75SP .50 + X-77 2.29 cd 34.0 ab 8.5 cde
Orthene 75SP 1.0 1.67 fg 13.0 cde 0.0 g

Monitor 4E .50 2.06 def 19.8 bc 3.0 efg
Monitor 4E .50 + X-77 2.04 def 21.0 bcd 3.0 fg
Monitor 4E 1.0 1.56 gh 6.6 ef 0.0 g
Ambush 2EC .10 1.06 hi 1.0 fg 0.0 g

*Means within each column followed by the same letter are not significantly
different at the 5% level by Duncan's Multiple Range Analysis. Damage ratings
and percentages were transformed (x2 and sine-l Fx, respectively) prior to
analysis.


Compound


Ammo


Coax


Cymbush


Larvin


Source and Composition


FMC Corporation, a 2.5 EC formulation of
cypermethrin.

Buckeye Cellulose Corporation, a feeding
stimulant formulated as a wettable powder.

ICI Corporation, a 3.0EC formulation of
cypermethrin.

Union Carbide Agricultural Products
Company, a 4.18F formulation of thiodicarb.


U-56295 Upjohn Company, a 85WP formulation of a
carbamate.


I




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