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Group Title: Research report Bradenton Gulf Coast Research and Education Center - BRA1987-6
Title: Weed control in row middles of mulched cauliflower
CITATION PAGE IMAGE ZOOMABLE PAGE TEXT
Full Citation
STANDARD VIEW MARC VIEW
Permanent Link: http://ufdc.ufl.edu/UF00067762/00001
 Material Information
Title: Weed control in row middles of mulched cauliflower fall 1985
Series Title: Bradenton GCREC research report
Physical Description: 3, 4 leaves : ; 28 cm.
Language: English
Creator: Gilreath, J. P ( James Preston ), 1947-
Dusky, Joan A
Botts, D
Gulf Coast Research and Education Center (Bradenton, Fla.)
Publisher: Gulf Coast Research & Education Center, IFAS, University of Florida
Place of Publication: Bradenton FL
Publication Date: 1987
 Subjects
Subject: Cauliflower -- Weed control -- Florida   ( lcsh )
Cauliflower -- Mulching -- Florida   ( lcsh )
Genre: government publication (state, provincial, terriorial, dependent)   ( marcgt )
non-fiction   ( marcgt )
 Notes
Statement of Responsibility: J.P.Gilreath, J.A. Dusky and D.Botts.
General Note: Caption title.
Funding: Florida Historical Agriculture and Rural Life
 Record Information
Bibliographic ID: UF00067762
Volume ID: VID00001
Source Institution: Marston Science Library, George A. Smathers Libraries, University of Florida
Holding Location: Florida Agricultural Experiment Station, Florida Cooperative Extension Service, Florida Department of Agriculture and Consumer Services, and the Engineering and Industrial Experiment Station; Institute for Food and Agricultural Services (IFAS), University of Florida
Rights Management: All rights reserved, Board of Trustees of the University of Florida
Resource Identifier: oclc - 73260858

Table of Contents
    Copyright
        Copyright
    Introduction
        Page 1
    Results
        Page 2
        Page 3
    Tables
        Page 4
        Page 5
        Page 6
        Page 7
Full Text





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





SCentral Science
c Library

"SEP 23 1987
Gulf Coast Research & Educa ion Center
IFAS, University of Fl ridajniversity of Florida
5007 60th Street Ea t
Bradenton, Florida 3 203

Bradenton GCREC Research Report BRA1987-6 March 1987

WEED CONTROL IN ROW MIDDLES
OF MULCHED CAULIFLOWER
FALL 1985

J. P. Gilreath, J. A. Dusky and D. Botts1

Applications of several preemergence herbicides (Table A) were made to
transplanted, polyethylene mulched 'Snow Crown' cauliflower in the fall of
1985 on the Townsite Farm of South Bay Growers at South Bay, FL. Herbicides
evaluated are not presently labelled for use on cauliflower. Forty-eight
plants were transplanted in each plot on 12 September 1985 at a spacing of
12.75 inches apart in two rows spaced 18 inches apart on 4 feet wide, 6 inch
high beds spaced 6 feet apart on centers. Twenty-five feet long single bed
plots were arranged in a randomized complete block design with 4
replications. Plots actually consisted of the two 18 inch wide middles on
either side -of the bed with guard rows between plots. Soil in the
experimental area was a fine sand with a pH of 7.5 to 8.0 and 3.06 to 3.40%
colloidal organic matter content.

Weed species-.in 'the experimental area and their approximate relative
concentrations were 20% crabgrass (Digitaria ciliaris), 20% goosegrass
(Eleusine indica), 5% purslanc- (Portulaca oleracea), 15% ragweed (Ambrosia
artemisiifolia), 30% spiny pigweed (Amaranthus spinosus), and 5% eclipta
(Eclipta alba). Irrigation consisted of continuous application of water via
seepage irrigation (the principal irrigation system in this area).
Fertilizer was applied preplant at the normal commercial rate for that farm.
Normal disease and insect control practices were maintained for the season.
Weather during the production season was mostly normal for the area.

Treatments (Table A) were applied 22 September 1985 with a CO2 back pack
sprayer. All plots except the weedy check were oversprayed with 1.0 lb.
a.i./A paraquat just prior to application of the preemergence materials in
order to control the existing small weeds. Weed control was evaluated 22
Oct. and 8 Nov. 1985, using a pretransformed 0 to 10 rating scale where 0
indicates no control and 10 represents complete control. Marketable curds
were harvested 18 Nov. 1985. The curd diameter for each of 10 randomly
selected curds was measured and the weight of 10 curds was recorded.



1Associate Professor of Weed Science, Associate Professor of Weed Science at
Everglades Research and Education Center, Belle Glade, and Florida Fruit
and Vegetable Association, respectively.









Table A. List of treatments applied to cauliflower row middles.

Rate Method of
(lb.a.i./A) _application_

1. Weedy check -
2. Hoed check --
3. Antor 1.0 preemergence
4. Antor 2.0 preemergence
5. Antor 4.0 preemergence
6. Cinch 0.75 preemergence
7. Cinch 1.5 preemergence
8. Goal 0.5 preemergence
9. Goal 1.0 preemergence
10. Goal + Cinch 0.5 + 0.6 preemergence
11. Goal + Cinch 0.5 + 1.2 preemergence
12. Goal + Cinch 1.0 + 0.6 preemergence
13. Goal + Cinch 1.0 + 1.2 preemergence
14. Dual 2.0 preemergence



RESULTS

Early season control of crabgrass and goosegrass was excellent with no
differences observed among herbicide treatments (Table 1). All treatments,
except the 1.0 Ib.a.i./A rate of Antor, provided excellent control (rating
of 9.0 or greater) of common purslane and ragweed. Spiny pigweed control
was good (rating of 8.0 to 8.9) to excellent (rating of 9.0 to 10.0) with
all herbicides with no significant differences among them (Table 1 cont'd).
All combinations of Goal + Cinch and 4.0 Ib.a.i./A Antor provided excellent
control of eclipta at this time; whereas, eclipta control with 1.0 lb.a.i./A
Antor and Dual was unacceptable (rating of 7.0 or less). Eclipta control
was good to excellent with Cinch and Goal when applied alone and was not
different from the level of control obtained using the tank mix of these two
products.

Weed control was evaluated again 10 days prior to harvest. At this time,
grass control was equally excellent with 4.0 lb.a.i./A Antor, 1.0 Ib.a.i./A
Goal and combinations of Goal + Cinch (Table 2). Grass control provided by
the low rate of Antor and Cinch was marginally acceptable; whereas, good
control was provided by 1.5 lb.a.i./A Cinch. Similar results were observed
for control of broadleaf weeds at this time, with the exception that the low
rate of Antor (1.0 lb.a.i./A) provided unacceptable control. Again, tank
mixing 0.5 lb.a.i./A Goal with 0.6 or 1.2 lb.a.i./A Cinch provided broadleaf
weed control comparable to that obtained with 1.0 Ib.a.i./A Goal alone.

Neither curd diameter nor total weight of curds from 10 plants was
influenced by treatment (Table 3). Curds were small due to the close
spacing and excessive leaching of fertilizer by rain. The lack of a yield
reduction in the weedy check is common with short season crops, particularly
cool-season crops, which are grown on raised beds covered with plastic
mulch. Similar results have been observed (J.P. Gilreath, personal







3


observation) in many such cropping situations. The lack of yield reduction
with these herbicides indicates that 1) the root systems did not contact
herbicide and/or 2) the fact that these treatments represent the best from
previous research. The latter fact explains the absence of more pronounced
differences in weed control in this experiment, since many poor performers
were previously eliminated. Particularly promising is the tank mix of Goal
with Cinch since Cinch provides the annual grass control which is frequently
absent with Goal, and Goal provides the consistent control of many broadleaf
weed species which Cinch does not offer. This work is continuing.

Mention of a specific proprietary product does not constitute an endorsement
by the author or the University of Florida. Growers are encouraged to
consult their county extension agent for specific recommendations of labeled
compounds. None of the herbicides evaluated in this test are currently
labeled for this use.









Table 1. Effect of preemergence herbicide treatments on weed control in row
middles of mulched, transplanted 'Snow Crown' cauliflower. South Bay, FL.
22 October 1985.

Rate Control rating
Treatment (Ib.a.i./A) Crabgrass Goosegrass Purslane


Weedy check -- 0.0 bY 0.0 b 0.0 c
Hoed check -- 9.6 a 9.6 a 10.0 a
Antor 1.0 8.2 a 8.0 a 7.2 b
Antor 2.0 9.7 a 9.8 a 9.0 a
Antor 4.0 6.9 a 9.9 a 10.0 a
Cinch 0.75 8.7 a 8.6 a 9.2 a
Cinch 1.5 9.2 a 9.2 a 9.8 a
Goal 0.5 9.6 a 9.4 a 9.0 a
Goal 1.0 9.7 a 9.9 a 10.0 a
Goal + 0.5 9.8 a 9.9 a 10.0 a
Cinch 0.6
Goal + 0.5 9.9 a 9.6 a 9.7 a
Cinch 1.2
Goal + 1.0 9.8 a 9.7 a 10.0 a
Cinch 0.6
Goal + 1.0 10.0 a 10.0 a 10.0 a
Cinch 1.2
Dual 2.0 9.7 a 9.2 a 8.8 a


ZWeed control was evaluated using a pretransformed 0 to 10 rating scale
where 0 indicates no control and 10 represents complete control.

YTreatment means within columns followed by the same letter are not
significantly different at the 5% level as determined by Duncan's new
multiple range test.










Table 1. con't. Effect of preemergence herbicide treatments on weed control
in row middles of mulched, transplanted 'Snow Crown' cauliflower. South Bay,
FL. 22 October 1985.


Rate Control rating
Treatment (lb.a.i./A) Ragweed Spiny pigweed Eclipta


Weedy check -- 0.0 cY 0.0 b 0.0 d
Hoed check -- 10.0 a 10.0 a 10.0 a
Antor 1.0 4.6 b 8.2 a 7.0 bc
Antor 2.0 9.6 a 9.7 a 8.4 abc
Antor 4.0 9.8 a 10.0 a 10.0 a
Cinch 0.75 9.2 a 9.1 a 8.7 abc
Cinch 1.5 9.5 a 8.1 a 8.1 abc
Goal 0.5 9.6 a 9.7 a 9.1 ab
Goal 1.0 10.0 a 10.0 a 9.8 a
Goal + 0.5 9.8 a 10.0 a 10.0 a
Cinch 0.6
Goal + 0.5 10.0 a 9.8 a 10.0 a
Cinch 1.2
Goal + 1.0 9.8 a 0.0 a 9.9 a
Cinch 0.6
Goal + 1.0 10.0 a 10.0 a 10.0 a
Cinch 1.2
Dual 2.0 8.8 a 8.1 a 6.5 c


ZWeed control was evaluated using a pretransformed 0 to 10 rating scale
where 0 indicates no control and 10 represents complete control.

yTreatment means within columns followed by the same letter are not
significantly different at the 5% level as determined by Duncan's new
multiple range test.










Table 2. Effect of preemergence herbicide treatments on weed control in row
middles of mulched, transplanted 'Snow Crown' cauliflower. South Bay, FL.
8 November 1985.


Rate Control rating
Treatment (Ib.a.i./A) Grass weeds Broadleaf weeds


Weedy check -- 0.0 eY 0.0 f
Hoed check -- 9.4 a 9.7 a
Antor 1.0 7.1 d 6.1 e
Antor 2.0 7.8 cd 7.2 de
Antor 4.0 9.2 ab 9.0 abc
Cinch 0.75 7.2 d 7.8 cd
Cinch 1.5 8.4 abcd 8.0 bcd
Goal 0.5 8.9 abc 8.9 abc
Goal 1.0 9.6 a 9.3 ab
Goal + 0.5 9.4 a 9.2 ab
Cinch 0.6
Goal + 0.5 9.4 a 9.3 ab
Cinch 1.2
Goal + 1.0 9.3 a 9.5 a
Cinch 0.6
Goal + 1.0 9.7 a 9.6 a
Cinch 1.2
Dual 2.0 7.9 bcd 7.4 de


ZWeed control was evaluated using a pretransformed 0 to 10 rating scale
where 0 indicates no control and 10 represents complete control.

yTreatment means within columns followed by the same letter are not
significantly different at the 5% level as determined by Duncan's new
multiple range test.










Table 3. Effect of preemergence herbicide treatments on yield of mulched,
transplanted 'Snow Crown' cauliflower. South Bay, FL. 18 November 1985.


Rate Curd diameter Curd weight/10 plants
Treatment (lb.a.i./A) (inches) (Ibs.)


Weedy check 4.8 aY 10.7 a
Hoed check -- 4.7 a 0.2 a
Antor 1.0 4.2 a 8.2 a
Antor 2.0 4.8 a 11.5 a
Antor 4.0 4.6 a 10.0 a
Cinch 0.75 4.2 a 9.3 a
Cinch 1.5 4.4 a 10.1 a
Goal 0.5 4.6 a 9.7 a
Goal 1.0 4.4 a 9.5 a
Goal + 0.5 4.4 a 9.9 a
Cinch 0.6
Goal + 0.5 4.3 a 8.6 a
Cinch 1.2
Goal + 1.0 4.5 a 9.6 a
Cinch 0.6
Goal + 1.0 4.2 a 8.8 a
Cinch 1.2
Dual 2.0 4.5 a 9.6 a


ZAverage diameter of 10 randomly selected curds,

YTreatment means within columns followed by the same letter are not.
significantly different at the 5% level as determined by Duncan's new
multiple range test.




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