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record of the Institute for Food and
Agricultural Sciences and should be
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Copyright 2005, Board of Trustees, University
c University of Florida v Li AS .Y
C t CENTRAL FLORIDA RESEARCH AND EDUCATION ENTER
5v Sanford, Florida -L u
Research Report SAN 85-6 ,- September 1984
*. -univ. ot Florida
BUDWORM CONTROL ON SWEET CORN, WINTER, 1983
G. L. Leibee
'Bonanza' sweet corn was planted October 26 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 CO2 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 November 17, 22, and 28, and December 1 and 5. Twenty
plants per plot were rated for damage on December 12 as follows: 0-no
apparent feeding damage; l-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 frugiperda (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.
Due to cooler temperatures the infestation of fall armyworm was light.
All the treatments were effective and had significantly (P < .05) less
damage than the untreated check. As a result of the light infestation,
responses to changes in rate or the addition of adjuvants did not occur.
The least effective treatment was Parathion 15WP at .25 lb al/acre. No
phytotoxicity was observed.
Percentage of Percentage of
Insecticide and Damage plants with a plants with a
Ib ai/acre rating* damage rating of 2* damage rating of 3*
Untreated check 1.53 a 26 a 20 a
Pydrin 2.4EC .05 1.01 c 2 c 1 cd
Pydrin 2.4EC .05 + .5 MGK 264 1.06 bc 3 c 2 bcd
Pydrin 2.4EC .05 + .5 PBO 1.03 c 2 c 1 cd
Pydrin 2.4EC .10 1.08 bc 1 c 4 bc
Pydrin 2.4EC .10 + .5 MGK 264 1.03 c 0 c 2 cd
Pydrin 2.4EC .10 + .5 PBO 1.08 be 2 c 6 bc
Pounce 3.2EC .15 1.02 c 2 c 1 ed
Pounce 3.2EC .2 .97 c 0 c 0 d
Ammo 2.5EC .08 1.00 c 0 c 1 cd
Pay-off 2.5EC .04 .98 c 1 c 0 d
Bay FCR 1272 2.OEC .044 .99 c 0 c 0 d
Larvin 3.2F .45 1.02 c 2 c 0 d
Larvin 3.2F .75 .95 c 0 c 0 d
Lorsban 4EC .5 .98 c 1 c 0 d
Lorsban 4EC 1.0 1.02 c 0 c 1 cd
Bolstar 6EC .5 1.00 c 1 c 0 d
Bolstar 6EC 1.0 .99 c 0 c 0 d
Lannate 1.8L .45 .96 c 1 c 0 d
Lannate 1.8L .45 + Coax 2 lb .97 c 1 c 0 d
Lannate 1.8L .90 .97 c lc 0 d
Lannate 1.8L .90 + Coax 2 lb .97 c 0 c 0 d
Parathion 15WP .25 1.21 b 9 b 6 b
*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-1 /x, respectively) prior to
Source and Composition
Bay FCR 1272
FMC Corporation, a 2.5EC formulation of
Mobay Chemical Corporation, a 2.0EC
formulation of baythroid, a synthetic
Buckeye Cellulose Corporation, a feeding
stimulant formulated as a wettable powder.
Union Carbide Agricultural Products Company,
a 3.2F.formulation of thiodicarb.
American Cyanamid Company, a 2.5EC formulation
of flucythrinate, a synthetic pyrethroid.