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Group Title: ARC-A research report - Agricultural Research and Education Center - RH-82-15
Title: Influence of selective herbicides on yield and vase life of leatherleaf fern
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Permanent Link: http://ufdc.ufl.edu/UF00066492/00001
 Material Information
Title: Influence of selective herbicides on yield and vase life of leatherleaf fern
Series Title: ARC-A research report
Physical Description: 4 p. : ; 28 cm.
Language: English
Creator: Stamps, R. H ( Robert Huguenor ), 1948-
Poole, R. T ( Richard Turk )
Agricultural Research Center (Apopka, Fla.)
Publisher: University of Florida, IFAS, Agricultural Research Center, Apopka
Place of Publication: Apopka FL
Publication Date: 1982
 Subjects
Subject: Leatherleaf fern -- Yields -- Florida   ( lcsh )
Plants -- Effect of herbicides on -- Florida   ( lcsh )
Genre: government publication (state, provincial, terriorial, dependent)   ( marcgt )
bibliography   ( marcgt )
non-fiction   ( marcgt )
 Notes
Bibliography: Includes bibliographical references (p. 3).
Statement of Responsibility: R.H. Stamps and R.T. Poole.
General Note: Caption title.
Funding: Florida Historical Agriculture and Rural Life
 Record Information
Bibliographic ID: UF00066492
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 - 71213805

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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









Influence of Selective Herbicides on Yield and

Vase Life of Leatherleaf Fern

R. H. Stamps and R. T. Poole
University of Florida 3 i ;
IFAS, Agricultural Research Center, Apopk
ARC-A Research Report RH-82-15
i.F.S.-Unriv of Florida
Research has shown thatmany selective herbicides known to be

effective suppressing various weeds are relatively safe to use in beds

of leatherleaf fern [Rumohra adiantiformis (G. Forst) Ching] (1,2,3,4,5).

Reduced weed growth with no apparent fern yield reduction is now commonly

attained commercially using selective herbicides applied preemergence to

the weeds. Previous studies have not, however, considered what effect the

herbicides have on postharvest vase life of cut fern fronds. This study

was initiated to determine what effect repeated applications of selective

herbicides have on yield and vase life of leatherleaf fern.

Materials and Methods

Herbicide applications to 2 year old leatherleaf fern beds started

November 7, 1979 and continued for 2 years. Table 1 lists names and

manufacturers of herbicides containing the active ingredients evaluated.

Treatments were untreated control, simazine + metolachlor at 1 + 2 lb ai

(active ingredient)/A (acre), oxadiazon + simazine at 1 + 1 lb ai/A and

oxadiazon at 2 lb ai/A. Each treatment was replicated 9 times. Granular

herbicide formulations were applied by hand every 4 months, immediately


No herbicides are presently registered for use on leatherleaf fern. Mention
of a herbicide does not constitute a recommendation by the authors and does
not imply its approval to the exclusion of other products.








after all plots, including controls, were weeded. Plots 4' x 8' were

located at the Agricultural Research Center Apopka, shaded with 73% shade

polypropylene fabric and fertilized monthly with granular 8-8-8 plus minors

fertilizer (461 lb N/A/yr). The soil type was Blanton fine sand. Fern was

harvested 11/20/79, 2/15/80, 5/29/80, 7/29/80, 9/5/80, 9/29/ 10/3/80,

12/10/80, 2/24/81, 4/12/81, and 9/23/81. Vase life determinations were made

by placing 20 fronds from each plot in 1/2 gallon beakers of deionized water

immediately after harvest. Stipe bases were recut before placing fronds in

water. Fern were held under simulated consumer use conditions in rooms

with light intensities of 150 foot-candles supplied by Cool White fluorescent

lamps 12 hours/day. Room temperatures were maintained between 65 78F

and relative humidity was 60 15%.


Table 1. Names and manufacturers of herbicides containing the

active ingredient evaluated.

Common name Trade
(ai) name Manufacturer

metolachlor Dual Ciba-Geigy
oxadiazon Progrow Ornamental
Herbicide I and Scotts
Ronstar Rhone-Poulenc
simazine Princep Ciba-Geigy


Results and Discussion

More fronds were harvested from control and simazine + metalachlor plots

than from oxadiazon treated plots (Table 2). The oxadiazon treated plots

sustained greater cold damage during the winter of 1980-81 because of a

heater malfunction. Despite this handicap the yield by weight was not

different for the control and oxadiazon treated plots due to the heavier


-2-







weight of fronds from the oxadiazon treated plots (Table 2). Research has

shown that frond weight and frond length are positively correlated (5),

therefore, fronds from the oxadiazon treated plots were generally longer

than those from the control. The yield by weight was greater (+ 20%) for

the simazine + metolachlor plots than the others, possibly due in part to

their being in the best cold protected area of the fernery.

Vase life of fronds from herbicide treated plots was not different

from the control at any harvest except for oxadiazon at 2 lb ai/A which

averaged almost 20% greater vase life than control in 1981 (Table 3).

Interestingly, fern harvested by commercial cutters in the afternoon on

9/30/80 lasted significantly longer (+ 31%) than the fern harvested on the

morning of 10/3/80. The possibility of such a diurnal effect on vase life

merits further study.

Summary

The herbicides tested did not reduce yields compared to control, in

fact, simazine + metolachlor actually increased yields. The herbicides also

did not reduce vase life. Harvest time may affect vase life of leatherleaf

fern.

Literature Cited

1. Poole, R.T. 1979. Influence of preemergence herbicides on weed control
and yield of leatherleaf fern, Rumohra adiantiformis (G. Forst) Ching.
Proc. Trop. Reg., Amer. Soc. Hort. Sci. 23: (In press).
2. Scudder, W. T., and L.L. Loadholtz. 1978. Weeds in leather-
leaf fern. Univ. of Fla. IFAS Agr. Res. Ctr. Apopka, Res. Rept. RH-78-5.
3. Stamps, R.H. 1980. Promising experimental preemergence herbicides for
suppressing weeds in leatherleaf fern. Univ. of Fla. IFAS Agr. Res. Ctr.
Apopka, Res. Rept. RH-80-14.
4. and D.D. Mathur. 1981. Herbicides and leatherleaf fern.
Univ. of Fla. IFAS Agr. Res. Ctr. Apopka, Res. Rept. RH-81-19.
5. and 1982. Herbicides for weed control in
leatherleaf fern. HortScience 17:201-203.









Table 2. Effects of herbicide treatments on yield and average frond
weights of leatherleaf fern.

Herbicide Rate in Yield Mean frond
weight
(formulation) lb ai/Az # bunches wt in Ibs in ounces

None 44.5 ay 34.6 b 0.50
Simazine (4G) + 1 +
metolachlor (15G) 2 50.2 a 41.4 a 0.53
Simazine (4G) + 1 +
oxadiazon (4G) 1 35.4 b 33.7 b 0.56
Oxadiazon (4G) 2 35.8 b 31.1 b 0.61

ZPounds active ingredient per acre.
YMean separation within columns by Duncan's multiple range test, 5% level.


Table 3. Effects of herbicide treatments on vase life of leatherleaf
fern fronds.

Herbicide Rate in Vase life in days
(formulation) lb ai/Az 7/29/80 9/5/80 9/23/81

None -11.4 ay 7.0 a 10.0 b
Simazine (4G) + 1 +
metolachlor (15G) 2 11.7 a 5.8 a 10.6 ab
Simazine (4G) + 1 +
oxadiazon (4G) 2 11.4 a 5.9 a 11.3 ab
Oxadiazon (4G) 2 11.8 a 6.2 a 11.8 a

ZPounds active ingredient per acre.
YMean separation within columns by Duncan's multiple range test, 5% level.




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