Title: Growth Retardants for aquatic vegetation management
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 Material Information
Title: Growth Retardants for aquatic vegetation management
Physical Description: Book
Creator: Sutton, David L.
Publisher: Agricultural Research Center, University of Florida
 Record Information
Bibliographic ID: UF00076444
Volume ID: VID00001
Source Institution: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: oclc - 144610898

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GROWTH RETARDANTS FOR AQUATIC VEGETATION MANAGEMENT-

David L. Sutton
Assistant Professor (Assistant Agronomist)
University of Florida Agricultural Research Center,
Fort Lauderdale, Florida 33314


ABSTRACT

Excessive growth of vascular aquatic plants and algae presents many
problems in management of the aquatic environment. Complete removal of
this vegetation may not always be desirable, and in some cases, the
maintenance of a reduced volume of plant populations may be a useful
management tool. Regulation of this biomass with growth retardants may
offer a means to reduce the rapid growth of aquatic weed species or slow
their growth rate to the extent that desirable plants could compete with
them for space.

In Florida, hydrilla (Hydrilla verticillata Royle) is the most
troublesome submersed aquatic plant. Regrowth of-this plant from tubers,
turions, and crowns, is one of the major problems when established popula-
tions of hydrilla are eliminated by present control methods. Use of
growth retardants selective toward hydrilla would help suppress the rate
of regrowth after removal of hydrilla stands and may allow effective com-
petition from desirable vegetation.

Screening trials are in progress with compounds which have already
shown growth retarding effects on terrestrial plants. These compounds
Share applied to 3.7-liter glass jars containing hydrilla growing in
0.1-strength Hoaglands nutrient solution under controlled environmental
conditions. Initial results indicate that some growth retardants will
reduce the growth rate of hydrilla with no visual damage to the plants.
For example, hydrilla plants exposed to a 5 ppmw concentration of a
compound containing 8.8% methyl 2-chloro-9-hydroxyfluorene-9-carboxylate,
2.1% methyl 9-hydroxyfluorene-9-carboxylate, and 1.6% methyl 2,7-dichloro-
9-hydroxyfluorene-9-carboxylate (Maintain CF-125i/) weighed 0.41 g dry
weight after 4 weeks as compared to 0.77 g for the control plants. Visual
examination of the hydrilla plants indicate no appreciable damage.


SCooperative investigations of the Florida Agricultural Experiment
Station; U.S. Department of Agriculture; U.S. Army Corps of Engineers;
and the Central and Southern Florida Flood Control District. This
research was supported in part by a research grant from the Florida
Department of Natural Resources.
2/
SMention of a trademark name or a proprietary product does not con-
stitute a guarantee or warranty of the product by the University of
Florida or U.S. Department of Agriculture and does not imply its
approval to the exclusion of other products that also may be suitable.









D. Distribution List


Copy No.

I Dr. Alva P. Burkhalter
Aquatic Plant Research & Control Coordinator
Florida Department of Natural Resources
Room 595, Larson Building
Tallahassee, Florida 32304

2 Dr. Bryson L. James
Director & Professor (Orn. Hort.)
University of Florida IFAS
Agricultural Research Center
3205 S. W. 70 Avenue
Fort Lauderdale, Florida 33314

3 Dr. John F. Gerber
Assistant Dean
1022 McCarty Hall
University of Florida
Gainesville, Florida 32601

4 Mr. Robert D. Blackburn
Location Leader
USDA, ARS, SRAO
Florida Area Fort Lauderdale Location
3205 S. W. 70 Avenue
Fort Lauderdale, Florida 33314

5 Dr. Edward Gangstad
Department of the Army
Office of the Chief of Engineers
Washington, D. C. 20314

6 Mr. Robert J. Gates
Southwest Florida Water Management District
1000-Marine Parkway, Apt. 205A
New Port Richey, Florida 33552

7 Mr. Zeb C. Grant, Director
Maintenance & Operations
Central and Southern Florida Flood Control District
P. O. Box 1671
West Palm Beach, Florida 33408

8 Dr. William B. Ennis
USDA, ARS
Office of Director
Plant Industry Station
Beltsville, Maryland 20705




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