are also used for control
(Goldsby, Bates, and Stanley 1978).
Water level manipulation was one of the
of plant control
in Louisiana, principally because herbicides were too costly, and harvesting
tended to spread the infestation
Lantz et al. (1964) and
Lantz (1974) have described the use of
for plant control in several
A mid-summer to mid-October
at Anacoco Reser-
voir opened it to recreation by eliminating water shield
and by controlling parrot feather
and water lily
(Nuphar odorata). However,
(muskgrass) increased. An infesta-
tion of pondweed (Potamogeton sp.) and naiads
reduced from 285 to 16 ha by a winter
at Bussey Reservoir.
of Lake Ocklawaha
Reservoir) in central
Florida was probably a failure.
Some nuisance plants were controlled, such as
and Brazilian elodea
(1975) attribute at least some of this response to a mild winter.
Beard (1973) described the successful use of a winter
The pondweeds Potamogeton robbinsii and P.
coontail, and milfoil were controlled, and 80 percent of the reservoir was
opened to fishing.
However, Geiger (1983) found that the mild, wet winter of the Pacific
Northwest (Oregon) was inappropriate for using
to control milfoil,
Effectiveness, Costs, and Feasibility
Alligatorweed and hydrilla are serious nuisances in some southern reser-
apparently does not control them (Table LO), while
foil, coontail, Brazilian elodea, and southern naiad are controlled.
prospective user of this procedure should be aware that responses to
are species-specific and that successful control of some species may mean that
resistant ones wil 1 proliferate.
may be solved by the use of