Vol. 15—1961 - NorthEastern Weed Science Society

532.
PROGRESSREPORT ON THE FIELD TESTING OF
VARIOUSHERBICIDES FOR AQUATICWEEDCONTROL
by
JASON M. CORTELL, Biologist
ALLIED BIOLOGICAL CONTROLCORPORATION
Boston, Massachusetts
In recent years, a consicerab1e research effort has
been made in Getermining the potentials of Si1vex anc Granular
2,4-D formulations as effective aquatic herbicides.
Examination of the literature indicates that Si1vex
2-(2,4,5-Tr~chlorophenoxy)propionic acid,propy1ene glycol
formulation, was found to be highly effect.ive in the control
of a large complex of aquatic vegetation, such as: Myrionhyllum
sp., NYrnphaea, sp. NUPhar sp., ~rasenia sp., Cabomba sp., Elodea
sp., Ceratophyllum sp., Pontederia sp., Sagittaria sp.,
Ca1litriche sp., Juncus ap , , Typha sp , (1,2,8,10,12).
Similarly,field studies using various formulations
of granular 2,4-D have indicated satisfactory results in the
control of many susceptible forms, such as: MyrioQhyllgm-sp.,
Cabornba sp., Elode~ sp., Nymphaea sp., Nupher sp., Luclwigia,sp.,
Trapa sp., (4,5,7,9,11,12). .
While Silvex and Granular 2,4-D appear to be effectivu
against a wice range of species, nearly all repo~ts indicate
their ineffectiveness in the control of pond weeds, Potamogeton
sp.
Since this 'species and other highly resistant forms,
play an important role in thE ;co10gy of a weed infested pond,
their control is cvns Lder-od to be highly desirable.
Flanagan (1960) reported excellent control was obtained
of Potamogeton ap , with Sinliazine at 3.0 ppm. (3). A progress
report on the usc of Aqua Ld.n' Herbicide by Green (1960) LndLcat ed
that subm,~rged anc floating forms appoared to be susceptible
to this chamical (6).
The purpose of this study is to evaluate the
effectiveness of certain herbicides for use iri the control of
aquatic vegetation, with particular reference to species of
Potamogeton sp.