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Group Title: Caterpillar control on cabbage.
Title: Caterpillar control on cabbage. Winter 1987-88
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Permanent Link: http://ufdc.ufl.edu/UF00075821/00006
 Material Information
Title: Caterpillar control on cabbage. Winter 1987-88
Series Title: Caterpillar control on cabbage.
Translated Title: Research Report - University of Florida Central Florida Research & Education Center ; 88-05 ( English )
Physical Description: Serial
Language: English
Creator: Leibee, Gary L.
Savage, Kenneth E.
Publisher: University of Florida, Central Florida Research & Education Center
Publication Date: 1988
 Record Information
Bibliographic ID: UF00075821
Volume ID: VID00006
Source Institution: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: oclc - 144607785

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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




3O



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

Research Report SAN 88-05 October 1988

CATERPILLAR CONTROL ON CABBAGE I, WINTER, 1987-88

Gary L. Leibee and Kenneth E. Savage


'Gourmet' cabbage was transplanted on October 28, 1987, in
Myakka fine sand at the University of Florida's Central Florida
Research and Education Center in Sanford. A plot consisted of
three 50' rows with 12" plant spacing. Only the middle row was
treated with insecticide. Each plot was separated by four
unplanted rows; row spacing was 30". Nemacur 15G 2 lb ai/acre was
applied pretransplant in a 15" band for nematode control. Randox
4EC and Vegedex 4EC, both at 2 lb ai/acre, were applied for weed
control two days after transplant. 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
December 2, 7, 14, 21, and 28, 1987, and January 4, 1988.
) Insecticides and rates per acre tested were Dipel ES (Abbot) at 8
BIU alone and tank mixed with fenoxycarb 2E (Abbot) at 0.06, 0.12,
and 0.24 lb ai, Pydrin 2.4 EC (E. I. duPont deNemours & Co., Inc.)
at 0.2 lb ai, Larvin SC 3.2 F (Rhone-Poulenc) at 0.75 lb ai, and
Orthene 75 SP (Chevron Chemical Co.) at 1.0 lb ai. The wetting
agent, X-77 (Chevron Chemical Co.), was added to the spray mixture
at the rate 2.4 ml/gallon. Plants were sampled on December 1, 4,
9, 16, 23, and 30, 1987, January 6, 13, 21, and 29, February 3, 11,
and 17, 1988, to determine larval numbers. Randomly selected
plants from the middle row were cut off at ground level. Due to
increasing plant size, two plants per plot were sampled on the
first five dates, 1 on the next three, 1/2 on the next 2, and 1/4
on the last two. The plant samples were placed into berlese
funnels and subjected to heat for 24 hrs. Larvae were collected
into 70% ethyl alcohol and categorized according to species and
size (small, medium, or large). Plots were rated for damage based
on the general appearance of the plants on February 24, 1988 using
a scale of 1-6 similar to Greene et al., Jour. of Econ. Entomol.
62(4):798-800.

The infestation consisted of a heavy population of imported
cabbageworm, Pieris rapae (Linnaeus), and a very light population
of diamondback moth, Plutella xvlostella (Linnaeus). Based on the
overall plot damage ratings, all the insecticidal treatments
produced very clean cabbage, but upon close inspection (February
9 24, 1988), some feeding damage was evident on the wrapper leaves
in some treatments and not in others. The three fenoxycarb plus
Dipel ES and the Orthene treatments produced exceptionally clean








cabbage; i. e., no evidence of insect feeding damage. A slight
amount of damage was evident in the following treatments, listed
in order of increasing amounts of damage; Dipel ES alone, Pydrin,
and Larvin. It is interesting to note that the X-77 treatment
alone reduced the number of larvae and the amount of damage
relative to the untreated control. No problems with formulation
were encountered and no phytotoxicity was observed.












Table 1. Effect of various insecticide treatments on the
number of imported cabbageworm larvae, Pieris rapae (Linnaeus), in
cabbage.



Insecticide and Larvae/plant (Jan. 29)1
rate (ai/acre) -------------------------------
small medium large total DR2


Untreated check 3.50 a 2.50 a 2.50 a 8.50 a 5.00

Water + X-77 0.00 b 0.00 b 1.50 a 1.50 b 4.00

Dipel ES 8 BIU 0.00 b 0.00 b 0.00 b 0.00 b 1.25

Dipel ES 8 BIU +
Fenoxycarb 2E 0.06 0.00 b 0.00 b 0.00 b 0.00 b 1.00

Dipel ES 8 BIU +
Fenoxycarb 2E 0.12 0.00 b 0.00 b 0.00 b 0.00 b 1.00

Dipel ES 8 BIU +
Fenoxycarb 2E 0.24 0.00 b 0.00 b 0.00 b 0.00 b 1.00

Pydrin 2.4 EC 0.2 0.00 b 0.00 b 0.00 b 0.00 b 1.00

Larvin SC 3.2F 0.75 0.00 b 0.00 b 0.00 b 0.00 b 1.00

Orthene 75 SP 1.0 0.00 b 0.00 b 0.00 b 0.00 b 1.00


iMeans within each column followed by the same letter are not
significantly different at the .05 level by DMRT. Analyses
of variance were performed on transformed data (sqrt (X + 0.5)).

2Damage rating (DR) scale similar to that of Greene et al. J.
Econ. Entomol. 62(4):798-800: 1 = no apparent insect feeding;
2 = minor insect feeding on wrapper leaves only; 3 = moderate
insect feeding on wrapper leaves only; 4 = moderate insect feeding
on wrapper leaves, minor feeding on head, head unmarketable during
normal market conditions; 5 = moderate to heavy feeding damage on
wrapper leaves, moderate number of scars on head; 6 = considerable
insect feeding on wrapper leaves with numerous feeding scars on
head.









Table 2. Effects of various insecticide treatments on the
number of diamondback moth, Plutella xvlostella (Linnaeus), larvae
in cabbage.


Larvae/plant (Jan. 21)1
Insecticide and -------------------------------
rate (ai/acre) small medium large total DR2


Untreated check 0.50 NS 1.00 NS 2.00 a 3.50. a 5.00

Water + X-77 1.00 0.50 0.50 b 2.00 ab 4.00

Dipel ES 8 BIU 0.00 1.00 0.00 b 1.00 b 1.25

Dipel ES 8 BIU +
Fenoxycarb 2E 0.06 0.00 0.50 0.00 b 0.50 b 1.00

Dipel ES 8 BIU +
Fenoxycarb 2E 0.12 0.00 0.00 0.00 b 0.00 b 1.00

Dipel ES 8 BIU +
Fenoxycarb 2E 0.24 0.00 0.00 0.50 b 0.50 b 1.00

Pydrin 2.4 EC 0.2 0.00 0.00 0.00 b 0.00 b 1.00

Larvin SC 3.2F 0.75 1.00 0.00 0.00 b 1.00 b 1.00

Orthene 75 SP 1.0 0.00 0.00 0.00 b 0.00 b 1.00


Means within each column followed by the same letter are not
significantly different at the .05 level by DMRT. Analyses
of variance were performed on transformed data (sqrt (X + 0.5)).

2Damage rating (DR) scale similar to that of Greene et al., J.
Econ. Entomol. 62(4):798-800: 1 = no apparent insect feeding;
2 = minor insect feeding on wrapper leaves only; 3 = moderate
insect feeding on wrapper leaves only; 4 = moderate insect feeding
on wrapper leaves, minor feeding on head, head unmarketable during
normal market conditions; 5 = moderate to heavy feeding damage on
wrapper leaves, moderate number of scars on head; 6 = considerable
insect feeding on wrapper leaves with numerous feeding scars on
head.




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