Tile AQUATIC PLANT MANAGEMENT SOCIETY, INC
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TIlE AQUATIC PLANT MANAGEMENT SOCIETY, INC. 29th ANNUAL MEETING ) ABSTRACTS • ~:l \~j ',\ ,- .. 6. ~•. '·s~.( '. ~'Il~./ ;,t,~)~t~ ~ f~~... .,/ . "t'1.'"f';' JULY 16~19, 1989 Scottsdale, Arizona, U.S.A. J • Implications of Changing Kanagement Pressures for Aquatic Vegetation in British Drainage Channel Systems K. J. Murphy Department of Botany University of Glasgow Glasgow Gl2 BQQ, Scotland large areas of lowland Britain are drained by artificial drainage channel systems or canalized streams. Aquatic weed problems are severe in many of these systems. Herbicides (e.g. lerbutryn, diquat. dichlobenil, glyphosate) and physical control measures are currently the principal management pressures ) )nfluencing drainage channel vegetation. There is a trend towards 1ncreased reliance on biological control, using grass carp and shading by bank vegetation. A limited range of established·phase survival strategies appears to characterize the plant populations which make up the aquatic weed communities of these habitats. Altered management regimes may cause major changes, in terms of community structure, biomass and composition of weed communities compriSing species which exhibit these currently· successful strategies: some predictions are made of likely changes in species dominance in response to altered management pressure. Control of Aquatic Plants in Texas Canals John H. Rogers, Jr. Water Research Field Station Department of Biological Sciences University of North Texas Denton, Texas 76203 Vascular aquatic plants such as lIydrlll2 verticillata, Alternanthera philoxerojdes, lYnh! latifolia, Leersia aquatjca Myriophyllum spicatum, and Eichhornia crassipes frequently cause problems in irrigation canals and ditches in Texas. Biological, physical, mechanical, and chemical methods are used to reduce populations of these species to acceptable levels and permit delivery of water for crop irrigation. Some unique circumstances in Texas have prompted creative and unique solutions. ) ) ... AQUAHOG UPDATE: Hew Tools and Applications to Heet Hechanlcal Water Hanagement/Aquatlc Plant Problems Aquatic Uses for Triclopyr Tom McNabb 8ill Kl ine Aquatics Unlimited/American Dow Chemical Co. Lake and Canal 115 Perimeter Center Place, Suite 590 2150 Franklin Canyon Road Atlanta, GA 30346. Martinez, CA 94553. An update on Triclopyr (Garlon 3A) efficacy for aquatic uses Applications have been developed to perform various water will be presented, and a summary of environmental and dissipation management tasks from plant control to sediment removal. The characteristics will also be discussed. Aquamog is a multipurpose marine maintenance vessel. Emergent and submerged plant control applications will be highlighted. Grass Carp for Control of Hydrilia and Hygrophlla In Agricultural and Urban Waterways. Sonar Treatment Techniques for large Water Bodies and Flowing Canals }: ) Vernon V. Vandiver, Jr. and David L. Sutton Dav id P. Tarver University of Florida - IFAS Fort Lauderdale Research and Education Center Eli lilly Elanco Products Co. 3205 College Avenue 1499 Morning Dove Road Ft. Lauderdale, Florida 33314-7799. Tallahassee, FL 32312. Grass carp ((tenQQ1!~r~~Qn idgl~ Val.) have been used for The use of Sonar has resulted in selective long term control the biological control of Hydrilla (Hvdrilla verticillata Royle) of hydrilia In numerous lakes and reservoirs. Scattered treatment and other aquatic weeds such as torpedograss (Panicum repens l.) sites, treated over a period of time, have consistently improved in canals and ditches in citrus groves and vegetable farms in efficacy in large systems. Efficacy in rivers and flowing canals south Florida. the triploid grass carp have proved most effective has been less consistent due to herbicide dilution. Under an in controll ing regrowth of weeds in an integrated control program. Experimental Use Permit (EUP)in the Spring of 1989, Sonar trials Grass carp have now been stocked in two urban canal systems for were applied to flowing canals to determine the concentration and Indian hygrophila [Hygrophila polysperma (Roxb.) T. Anderson] exposure time required for target species control. control. An Update on the Toxicological Data Generated Triploid Grass Carp Stocktng Project for the Aquatic Herblclde-Endothall lake Harlon, South Carolina Or. Abraham J. Tobia Steven J. de Kozlowski, South Carolina Water Resources Commission Manager of Toxicology, Pennwalt Corp. 1201 Main Street, Suite 1100 Agchem Division, Three Parkway, Room 619 Columbia, SC 29201 Philadelphia, PA 19102. lake Marion, a 110,OOO-acre reservoir, has experienced a The Pennwalt Corporation over the past several years has been rapid spread of hydrilla since it was first discovered in 1982. developing the necessary toxicological data on the aquatic Hydrilla now occupies an estimated 13,000 acres and severely herbiclde-Endothall to ensure its' registration by the United impairs public use and aCCess for much of the year. The State has States Environmental Protection Agency. We will discuss this data initiated a 3-year project to stock 300,000 triploid grass carp to in detail and present an update as to where we are in the augment herbicide applications and provide long-term control. registration process. Will also discuss our future directions for ecause this is the largest lake ever stocked with triploid grass this product. ~ .j arp, studies are being conducted to monitor aquatiC plant coverage, grass carp movement, water quality, and native fish popUlations. The first 100,000 grass carp have been released and preliminary radio tracking results indicate that most of the fish are remaining in the target area. • Practice of Biological Control of Aquatic Weeds In Egypt Ilydrilla Eradication in San Francisco: A Unique Experience Using the Grass Carp Nale Dechor'etz Ahmed F. Khattab &Zenab El-Gharably California Deparlment of Food &Agriculture Ministry of Irrigation, Water Research Center Conlrol and Eradication, 1220 N Street, Room A-357, 22 El-Galaa St., Cairo, Egypt Sacramento, California 94271-0001. A brief summary of results achieved during the last B years Detection biologisls found hydrilla on December 8, 1988 in a of using grass carp to control aquatic weeds In Egypt. Emphasis 0.8 ha asphalt-lined reservoir. Eradication program included will be placed on results from the large scale stocking of the draining the reservoir followed by removal of all plant material, Bassousia Canal with 105 kg of grass carp per ha in 1987. soil, and debris. Asphall and the clay lining underneath was removed from areas within the reservoir infested with hydrilla. CORPS of Eng. In-House A.P.C. Tubers were found under and embedded in the asphalt. The exposed )\ '~as were treated with metham prior to reasphalting and refill ing Edward D. Knight ,lhe reservoir. U.S. Army CORPS of Engineers Thermal Stratification and Submersed Application Techniques P.O. Box 1317 Palatka, Florida 32078 Kurt D. Getsinger, W. T. Haller, and A. M. Fox The Corp maintains the St. Johns River for noxious aquatic US Army Engineer Waterways Experiment Station plants from Jacksonville to Cocoa. A diverse plant community P.O. Box 631, dictates that application technology remain current to obtain an Vicksburg, Mississippi 39180 and efficient operation. Although technology change is not an University of ~lorida, IFAS everyday occurrence, innovative ideas that come from the field, Center for Aquatic Plants, 7922 N.W. 71st Street have a positive effect on the aquatic plant control industry. Gainesville, Fl 32606. lakes and reservoirs become thermally stratified during Hanaglng Honoeclous Hydrilla In the Potomac River summer months when most submersed plant control activities occur. Stratification can influence the distribution of herbicides in the Debra J. Jellick and Thomas R. Schueler water column. Dense plant growth at, or on, the water surface can increase the degree of stratification and further reduce mixing of Metropolitan Washington Council of Governments surface applied herbicides below the thermocline. 1875 Eye Street, N.W., Suite 200 Washington, D.C. 20006. Sinking agents, granules, and injection hoses are often used to improve herbicide deposition in the water column. little Hydrilla verticillata is being managed in the Potomac River research has been conducted on the relative benefits of these through mechanical harvesting to keep boating access open into and application techniques. This paper will review thermal out of public facilities. Seventeen sites are scheduled for stratification in reservoirs/lakes and discuss preliminary results multiple harvests of 106 acres within a 19-mile stretch of of an application techniques study being conducted by the USAEWES hydrilla-dominated shoreline. Total distribution of submerged and the UF Center for Aquatic Plants. aquatic vegetation increased from 400 acres in 1983 to 3,700 acres in 1988 from Washington, D.C. to Quantico, VA. Difficulties encountered include 2-3 ft. tidal ranges, inconvenient transfer ramps and disposal sites, multiple state/local jurisdictions, escaped floating fragments, and mobilization/demobilization costs. )) ) ... flowering Rush - A Recent Arrival In Western Water Systems Recent findings Regarding the Efficacy Fred l. Nlbllng. Jr. and John E. Boutwell of Benthic Barriers U. S. Bureau of Reclamation G. Douglas Pullman, Gloria Janik and Jeff Randle Denver, Colorado. Cygnet Enterprises flowering rush (~ytomu~ umb~ll!tl!.1~ l.). an introduced )014 North Bridge Street perennial aquatic plant. has become a troublesome weed in P.O. Box