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Group Title: Budworm control on sweet corn
Title: Budworm control on sweet corn. Fall 1983
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Permanent Link: http://ufdc.ufl.edu/UF00075813/00002
 Material Information
Title: Budworm control on sweet corn. Fall 1983
Series Title: Budworm control on sweet corn.
Translated Title: Research Report - University of Florida Central Florida Research and Education Center ; 85-5 ( English )
Physical Description: Serial
Language: English
Creator: Leibee, G. L.
Publisher: University of Florida, Central Florida Research and Education Center
Publication Date: 1983
 Record Information
Bibliographic ID: UF00075813
Volume ID: VID00002
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




I00


University of Florida
<-'- ~ CENTRAL FLORIDA RESEARCH AND EDUCATION C2NE n. d
Sanford, Florida. L

Research Report SAN 85-5 September l9f4

BUDWORM CONTROL ON SWEET CORN, FALL 19F.A.S. -Univ. of Florida

G. L. Leibee


'Silver Queen' sweet corn was planted September 12 in Myakka fine
sand on the University of Florida's Central Florida Research and Education
Center in Sanford. Lasso 15G 3 lb ai/acre was incorporated in a 15" band at
planting time for weed control. Treatments were applied to single row, 40'
plots with 12" plant spacing. Rows were spaced 5' apart. Treatments were
replicated five times in randomized complete blocks separated by 10' weed-
free alleys. Sprays were applied with a C02 pressurized sprayer mounted
on an Allis-Chalmers model G tractor. 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. Sprays were
applied October 5, 7, and 11. Twenty plants per plot were rated for
damage on October 12 as follows: O=no apparent feeding damage; 1=etching
or feeding holes in outer leaves, no whorl damage; 2=light whorl damage
(some whorl leaves without damage); 3-heavy whorl damage (all whorl leaves
damaged). Damage ratings were taken when the plants were 12 to 18" tall;
the stage considered most susceptible to bud destruction by fall armyworm,
Spodoptera frusiperda (J. E. Smith). Only the percentage of plants showing
ratings of 2 and 3 were included in the table since a rating of 1 was not
considered a threat to the plant.

The infestation of fall armyworms was considered very heavy. All the
plants were damaged in this experiment (no ratings of 0). Damage was
obvious and progressing quickly (due to very warm temperatures) when the
first application was made. Two more applications were made within one
week of the first due to the severity of the infestation. This frequency
of insecticide application is typical when heavy infestations are encountered
in central Florida. Sprays are often applied every day in these situations
until it is evident that new growth is not being damaged. The insecticides
providing worthwhile efficacy were Lannate 1.8L, Lorsban 4EC, Larvin 3.2F,
Pay-off 2.5EC, and Bolstar 6EC. Lannate 1.8L at .9 lb ai/acre resulted in
the least amount of damage. It is interesting to note that Lannate,
considered the standard budworm control in central Florida, has been reported
by several growers to have lost its effectiveness. This contradiction may
be due more to differences in application methods than to actual differences
in toxicity; i.e., the growers generally use aerial application versus the
method described in this experiment. The least effective insecticide was
Parathion 4E. The consensus by many researchers that synthetic pyrethroids,
in general, are not effective fall armyworm insecticides is supported by
the results of this experiment, except for Pay-off 2.5EC, which resulted
in control considered worthwhile. Even though differences were not
significant (P > .05), the addition of the synergists MGK 264 and pperonyl
butoxide (PBO) to Pydrin 2.4EC resulted in trends of increasing efficacy over
Pydrin 2.4EC alone, with PBO being the most effective. Rate responses
occurred with Lannate 1.8L, Lorsban 4EC, and Bolstar 6EC. No phytotoxicity
was observed.









Percentage of Percentage of
Insecticide and Damage plants with a plants with a
lb ai/acre rating* damage rating of 2* damage rating of 3*

Untreated check 2.38 a 39.0 ab 48.0 a
Pydrin 2.4EC .05 1.78 bc 22.8 abc 26.0 b
Pydrin 2.4EC .05 + .5 MGK 264 1.58 b-e 19.0 cd 19.0 bcd
Pydrin 2.4EC .05 + .5 PBO 1.48 c-g 19.0 a-d 13.0 b-g
Pydrin 2.4EC .10 1.60 bcd 17.4 cd 21.8 bc
Pydrin 2.4EC .10 + .5 MGK 264 1.52 c-f 21.0 abc 14.0 b-f

Pydrin 2.4EC .10 + .5 PBO 1.38 d-g 16.0 cd 10.0 b-g'
Pounce 3.2EC .1 1.46 c-g 15.0 cd 14.0 b-e
Pounce 3.2EC .2 1.40 d-g 17.0 bcd 11.0 b-g
-Ammo 2.5EC .08 1.34 d-g 12.0 c-f 10.0 b-g
Pay-off 2.5EC .04 1.22 d-g 13.0 c-f 4.0 d-g
Bay FCR 1272 2.0EC .044 1.44 d-g 13.6 cde 14.6 bcd

Larvin 3.2F .45 1.20 efg 15.0 cd 3.0 fg,
Larvin 3.2F .75 1.30 d-g 11.0 c-f 8.0 b-g
Lorsban 4EC .5 1.46 d-g 16.0 cd 14.0 bcd
Lorsban 4EC 1.0 1.18 fg 3.0 c-f 4.0 efg
Bolstar 6EC .5 1.42 d-g 15.0 cd 13.2 b-e
Bolstar 6EC 1.0 1.24 d-g 7.0 def 8.2 c-g

Lannate 1.8L .45 1.22 efg 10.2 c-f 5.0 d-g
Lannate 1.8L .45 + Coax 2 lb. 1.22 d-g 10.0 c-f 5.2 d-g
Lannate 1.8L .90 1.08 g 3.2 ef 2.0 g
Lannate 1.8L .90 + Coax 2 lb. 1.08 g 2.0 f 2.0 g
Parathion 4E .25 1.92 b 39.8 a 25.6 ab


*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 /x, respectively) prior to
analysis.


Compound


Source and Composition


Ammo


Bay FCR 1272



Larvin



Pay-off


FMC Corporation, a 2.5EC formulation
of cypermethrin.

Mobay Chemical Corporation, a 2.0EC
formulation of baythroid, a synthetic
pyrethroid.

Union Carbide Agricultural Products
Company, a 3.2F formulation of
thiodicarb.

American Cyanamid Company, a 2.5EC
formulation of flucythrinate, a
synthetic pyrethroid.




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