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ensure accuracy. Ecologically Based Pest Management: New
Solutions for a New Century tions of aquatic plants in fresh
water and brackish water systems (Charudattan et al., 1990).
However, despite this potential, commercial development and use
of microbial agents as bioherbicides to manage aquatic weeds has
lagged because of the high cost of registering microbial
herbicides under Federal Insecticide, Fungicide, and Rodenticide
Act (FIFRA) requirements and because of the technological
difficulties in producing practical levels of control under
field conditions (Charudattan, 1990b). Certain other
miscellaneous agents such as snails (Marisa cornuarientis and
Pomacea australis), the manatee (Trichechus manatus), the
crayfish (Orconectes causeyi), and competing plants (e.g.,
Eleocharis spp.) have been considered as biological-control a