Table 10
of
A
the Response of Some Common Nuisance
Macrophytes to
(Modified from
Cooke et al. 1986)
Species That Usually Increase
A.
(alligatorweed)
1.
(hydrilla)
2.
Najas
(bushy pond weed)
3.
Species That
Decrease
B.
(coontail)
1.
(Brazilian elodea)
2.
spp. (milfoil)
3.
Najas
(southern naiad)
4.
C.
Species That Are Unaffected or Whose Response is Variable
Eichhomia crassipes (waterhyacinth)
1.
canadensis (elodea)
2.
Cooke et al. (1986) describe and review case histories for several cli-
matic regions of the United States and provide a detailed summary of the pub-
lished responses of 74 species of aquatic plants to summer, winter, and annual
Table 10 is a summary of the responses of
exposure to water level drawdown.
Some of these case histories are summarized
some of the most common plants.
herein to indicate the effectiveness of this method.
Eurasian watermilfoil
has become a nuisance in
Tennessee Valley Authority reservoirs, particularly those with small (0.2 to
The herbicide 2,4-D is effective
1.0 m) annual water level fluctuations.
against this plant in cove areas, but winter water level
has been
The normal 3-m
at
found to be the most effective means of control.
ills all of the plants along
Bar and Chickamauga Reservoirs
Because these reservoirs are multipurpose, the use of
drained shorelines.
4t
Hill
2,4-D
drawdowns is sometimes limited (Smith 1971).
110
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