Growth and Reproductive Physiology of Fluridone-susceptible and -resistant Hydrilla (Hydrilla Verticillata) Biotypes

Hydrilla is one of the most serious aquatic weed problems in the United States, and fluridone is the only U.S. Environment Protection Agency (USEPA)-approved herbicide that provides relatively long-term systemic control. Recently, hydrilla biotypes with varying levels of fluridone resistance have be...

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Bibliographic Details
Published in:Weed science 2007-09, Vol.55 (5), p.441-445
Main Authors: Puri, Atul, MacDonald, Gregory E, Haller, William T, Singh, Megh
Format: Article
Language:English
Subjects:
Agricultural management
aquatic weed
aquatic weeds
Biological and medical sciences
Biomass
Biomass production
biotypes
Chemical control
Flowers
fluridone
Fundamental and applied biological sciences. Psychology
Herbicide resistance
Herbicides
Hydrilla verticillata
noxious weeds
Parasitic plants. Weeds
phenotype
Photoperiod
Phytopathology. Animal pests. Plant and forest protection
Plant growth
plant reproduction
Plants
reproductive physiology
strain differences
strains
Urogenital physiology
Weed Biology and Ecology
Weeds
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Summary:Hydrilla is one of the most serious aquatic weed problems in the United States, and fluridone is the only U.S. Environment Protection Agency (USEPA)-approved herbicide that provides relatively long-term systemic control. Recently, hydrilla biotypes with varying levels of fluridone resistance have been documented in Florida. Several biotypes of hydrilla varying in resistance levels were maintained in 950-L tanks under ambient sunlight and day-length conditions from September 2004 to September 2005 in absence of fluridone. Phenotypic measurements were performed during this 1-yr period to monitor differences in growth and reproductive physiology. All fluridone-resistant biotypes (except R3) were growing at the same rate or greater than the susceptible hydrilla. These data suggested that there are no deleterious effects on growth and reproductive physiology because of development of fluridone resistance. Aggressive spread of fluridone-resistant dioecious hydrilla in aquatic ecosystems can severely affect hydrilla management and, consequently, cause substantial and long-lasting ecological and economic problems throughout the southern United States.
ISSN:0043-1745
1550-2759
DOI:10.1614/WS-07-020.1