Historic note

Group Title: Research Report - University of Florida Agricultural Research and Education Center ; BRA1983-19
Title: Herbicides for strawberry row middles
Full Citation
Permanent Link: http://ufdc.ufl.edu/UF00056155/00001
 Material Information
Title: Herbicides for strawberry row middles
Series Title: Research Report - University of Florida Agricultural Research and Education Center ; BRA1983-19
Physical Description: Book
Language: English
Creator: Gilreath, J. P.
Publisher: Agricultural Research and Education Center, IFAS, University of Florida
Publication Date: 1983
 Record Information
Bibliographic ID: UF00056155
Volume ID: VID00001
Source Institution: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: oclc - 62507803

Table of Contents
    Historic note
        Historic note
        Page 1
        Page 2
Full Text


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

site maintained by the Florida
Cooperative Extension Service.

Copyright 2005, Board of Trustees, University
of Florida


Cf Agricultural Research & Education Center
IFAS, University of Florida
^-) 5007-60th Street East
Bradenton, Florida 34203

Bradenton AREC Research Report BRA1983-19 July 1983


J. P. Gilreath2

Weed control in row middles of strawberry fruiting fields is a continual
problem for most Florida growers. Although Devrinol is labeled for use
in strawberries, it seldom offers season long control due to the long
growing season, diversity of weed species present at different periods of
the production season and the leaching effect of the large quantities of
water applied during the season for plant establishment and frost protec-
tion. As a result, use of some contact herbicide is a necessity and
ideally it should be applied in combination with a preemergence herbicide
in order to reduce the number of applications. In response to this's:'ed
an experiment was conducted in winter-spring 1981 to evaluate three
contact herbicides (Paraquat, Diquat and Hoe 00661), alone and in combination
with Devrinol, for control of established winter weeds and residual control
of subsequent weed flushes during the harvest season.

Herbicide treatments (Table 1) were applied to row middles of fruiting
strawberries on January 8, 1982 using a CO2 backpack sprayer equipped
with a TK-4 flood-jet nozzle delivering 42.9 gallons of spray per acre.
Treatment plots were arranged in a randomized complete block design and
replicated four times. Row width was 4 feet with 2 feet wide raised,
mulched beds. Plot length was 12 feet. Weed control was evaluated
January 18 and April 27, 1982 using a 0 to 10 scale where 0 = no control
and 10 = 100% control. Weed pressure was not high in the test area,
especially with regard to grass species.

All herbicide treatments were equally effective in controlling Carolina
geranium and Evening primrose when evaluated 10 days after application
(Table 1). By the end of April differences were observed between
treatments for residual broadleaved weed control, although control was
generally poor and, in most cases, commercially unacceptable. Treatments
containing Devrinol provided the best control, which is as one would
-xpect, since this is a preemergence material which offers residual control.
Squally effective were both rates of Paraquat and Hoe 00661 which illustrates
-hat broadleaved weed pressure was not intense and thus by offering

"Mention of a specific herbicide does not constitute an endorsement by the
author or the University of Florida.
"Assistant Professor (Weed Scientist)


complete kill in January, these treatment plots were maintained somewhat
weed-free. The relatively poor performance of Devrinol was due to the
extreme leaching conditions to which the herbicides were subjected and
its poor activity on the principle weed species present. No major
flushes of broadleaved weed emergence occurred after the first rating
period. Although treatments containing Devrinol provided good to excellent
control of grass weeds in late April there were no significant differences
between any of the treatments due to the extreme variability between
replicates and.the low grass weed pressure. Based on these results
there appeared to be no advantage to using more than 0.5 lb. a.i./A of
Paraquat. For long term control of broadleaved weeds, Paraquat seemed
to do a better job than Diquat. Under the conditions of this expe-
riment, there was no advantage to including Devrinol with a contact
herbicide; in fact, economically.one might be better off to merely rely
on contact herbicides alone.

Table 1. Influence of herbicide treatment on weed controlz in strawberry
row middles. Dover, FL. 1982.

Rate January 18 April 27
Treatmenty (lb. a.i./A) Carolina Evening
Geranium Primrose Broadleaf Grass

Untreated check 3.2b 3.0b 0.8c 6.2a
Paraquat 0.5 9.8a 9.0a 5.0ab 5.4a
Paraquat 1.0 9.8a 9.5a 6.6a 7.2a
Diquat 0.5 9.8a 8.8a 4.0b 6.6a
Diquat 1.0 9.8a 9.0a 3.9b 5.0a
Hoe 00661 0.75 9.4a 9.7a 7.2a 7.0a
Hoe 00661 1.0 9.8a 9.8a 5.5ab 6.2a
Paraquat + Devrinol 0.5 + 2.0 9.6a 8.9a 7.6a 9.2a
Hoe 00661 + Devrinol 0.75 + 2.0 9.0a 9.5a 7.4a 7.9a
Hoe 00661 + Devrinol 1.0 + 2.0 9.8a 9.6a 7.8a 8.4a
Diquat + Devrinol 0.5 + 2.0 10.Oa 9.3a 6.6a 9.8a

ZWeed control was evaluated on a 0 to
100% control.
YApplications containing Paraquat and
8 oz./100 gal.

10 scale where 0 = no control and 10

Diquat included. X-77 at a rate of

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