Accession Number : ADA290967

Title :   Biological and Host Range Studies with Bagous affinis, An Indian Weevil that Destroys Hydrilla Tubers. Aquatic Plant Control Research Program.

Descriptive Note : Final rept.,

Corporate Author : AGRICULTURAL RESEARCH SERVICE GAINESVILLE FL

Personal Author(s) : Buckingham, Gary R. ; Bennett, Christine A.

PDF Url : ADA290967

Report Date : DEC 1994

Pagination or Media Count : 56

Abstract : Hydrilla verticillata (L.f.) Royle (common name hydrilla) is a noxious aquatic plant introduced into the United States from Africa through the aquarium industry. Two reproductive structures that enable hydrilla to withstand extremely harsh weather conditions are turions or winter buds (dense clusters of apical leaves that are produced in the leaf axils, green and ovoid-conical shaped buds) and bubil like hibernacular structures, commonly, but incorrectly, called tubers (formed at the ends of stolons buried in the substratum). Tubers can remain dormant in the sediment for several years and remain viable. Hydrilla plants may he found in lakes, rivers, drainage and irrigation canals, ponds, and streams. Severe infestations of hydrilla can restrict boat traffic and interfere with fisheries and waterflow. Hydrilla is a nuisance adventive submersed aquatic plant that reproduces by fragmentation, tubers (which may remain dormant in the substrate for several years and yet remain viable), turions, as well as by seeds (in the monoecious variety). This plant is one of the most prolific problem aquatic plants in the United States, causing problems in many lakes and reservoirs with recreation and navigation. It is extremely difficult to control because of its varied methods of reproduction. Hydrilla is found in many southern states, California, and recently Virginia; it is removed in most cases by mechanical methods or by using herbicides. Mechanical removal tends to increase the spread of hydrilla because of fragmentation; while herbicides are used in various places, a major concern exists for the environment and water quality.

Descriptors :   *PLANT GROWTH, *HOSTS(BIOLOGY), *AQUATIC PLANTS, *BIOLOGICAL WEED CONTROL, REMOVAL, WEATHER, BIOLOGY, SUBSTRATES, CLUSTERING, NAVIGATION, HIGH DENSITY, RIVERS, AFRICA, WATER QUALITY, FISHERIES, WATER TRAFFIC, LAKES, SEDIMENTS, RECREATION, RESERVOIRS, IRRIGATION SYSTEMS, HERBICIDES, SEEDS, REPRODUCTION(PHYSIOLOGY).

Subject Categories : Biology
      Agronomy, Horticulture and Aquiculture

Distribution Statement : APPROVED FOR PUBLIC RELEASE