Appendix 3:
Toxicity of Poast to fish, aquatic invertebrates, and aquatic plants.
Animal
Exposure
Response
Reference
Bluegill sunfish
(
Lepomis
macrochirus)
Bluegill sunfish
(
Lepomis
macrochirus)
Sheepshead minnow
(
Cyprinodon
variegatus), <24
hours old
Sheepshead minnow
(
Cyprinodon
variegatus)
2.2 ppm BAS 562 H under
flow-through
conditions for
28 days; depuration period
of 14 days
2.78 ±0.30 ppm (
measured
concentration) of
14
C-labeled BAS 9052
(
Poast
2
, 19.3% a.i.) under
flow-through conditions for
30 days; depuration period
of 14 days
Mean measured
concentrations of 0, 6.6, 13,
25, 50 or 98 mg ai/L
sethoxydim for 33 days
0, 2.7, 4.5, 7.2, 10.8, or 18.0
mg/L
Poast
for 96 hours
under static unaerated
conditions. [Note: No
substantial concentration
related effects on dissolved
oxygen or pH. Oxygen
depletion with time in both
exposed and control
groups.]
Low tendency of sethoxydim
or
its metabolites to
concentrate in bluegill
sunfish.
BCF:
whole body = 21 (elimination
half-life = 3.6 days)
edible tissue = 7 (elimination
half-life = 3.6 days)
nonedible tissue = 25
(elimination half-life = 3.6
days)
maximum BCF in whole fish
= 6.98 and maximum residue
level during uptake = 16.6
ppm;
maximum BCF in nonedible
tissue = 7.66 and maximum
residue concentration = 18.2
ppm;
maximum BCF in edible
tissue = 2.87 and maximum
residue concentration = 6.82
ppm;
NOEC = 98 mg ai/L
LOEC >98 mg ai/L
MATC >98 mg ai/L
96-hour LC
50
= 3.5 mg/L
(95% CI = 2.7-4.5 mg/L)
NOEC (survival) = 2.7 mg/L
(estimated)
2.7-18.0 mg/L caused loss of
equilibrium
and surfacing
during the test.
McKenna and Patel
1991
MRID 42118001-A
MRID 42118001-B
Vilkas and Kuc
1981a
MRID 00100537
Graves et al. 1995
MRID 43614601
Ward and Boeri
1989a
MRID 41510602
Appendix 3-2
Appendix 3: Toxicity of Poast to fish, aquatic invertebrates, and aquatic plants.
Animal
Exposure
Response
Reference
Sheepshead minnow
(
Cyprinodon
variegatus)
Channel catfish
(
Ictalurus punctatus),
300 treated and 300
untreated
Mean measured
concentrations of 0 or 145.8
mg/L sethoxydim (BAS
9052 H;
Poast
2
, 19.3% a.i.)
under static unaerated
conditions for 96 hours
0.084±0.001
14
C-labeled
BAS 9052 (
Poast
2
, 19.3%
a.i.) under static conditions
for 34 days; depuration
period of 14 days
water concentration was
achieved by applying
14
C-labeled BAS 9052 to
sandy loam soil at a
surface application rate of
0.5 lb ai/acre.
96-hour LC
50
>145.8 mg/L
No sublethal effects were
observed.
maximum
BCF during uptake
were: 0.747 in whole fish,
0.398 in edible tissues, and
0.714 in nonedible tissues
after 14-day depuration,
14
C-residue concentrations in
whole fish = 67.9% of
maximum during uptake;
14
C-residue concentrations in
nonedible tissues =76% of
maximum during uptake;
residue
concentration in
edible tissues = 10% greater
than the maximum during
uptake.
Ward and Boeri
1992a
MRID 42315101
Vilkas and Kuc
1981b
MRID 00100538
Appendix 3-3
Appendix 3: Toxicity of Poast to fish, aquatic invertebrates, and aquatic plants.
Animal
Exposure
Response
Reference
Invertebrates
Eastern oyster
(
Crassostrea
virginica),
embryos
Eastern oyster
(
Crassostrea
virginica), embryos
and larvae
Mysid shrimp
(
Mysidopsis bahia),
<24 hours old
Mysid shrimp
(
Mysidopsis bahia),
11 days old
Daphnia magna,
neonates (<24 hours
old)
Daphnia magna
Mean measured
concentrations of 0 or 109
mg/L sethoxydim tech for
48 hours under static
conditions
Nominal concentrations of
0.0-2.5 mg/L Poast for 96
hours under static unaerated
conditions
0 or 141.8 mg/L sethoxydim
(BAS 9052 H;
Poast
2
,
19.3% a.i.) under static
unaerated conditions for 96
hours
Nominal concentrations of
0.0-3.0 mg/L Poast for 96
hours under static unaerated
conditions
Nominal concentrations of
0, 0.54, 1.1, 2.2, 4.3, or 8.6
mg/L BAS 9052 06H (
Poast
2
, 19.3% a.i.) for 48 hours
under static conditions;
(mean measured
concentrations of 0, 0.57,
1.1, 2.4, 4.6 or 8.9 mg/L)
48-hour EC
50
>109 mg/L
NOEC = 109 mg/L
48-hour EC
50
= 0.9 mg/L
(95% CI = 0.6-1.0 mg/L)
96-hour LC
50
>141.8 mg/L
No
sublethal effects were
observed
96-hour LC
50
= 0.8 mg/L
(95% CI = 0.7-1.1 mg/L)
No sublethal effects were
observerd.
48-hour EC
50
= 2.6 mg/L
(95% CI = 2.0-3.3 mg/L)
NOEC = 1.1 mg/L
48-hour LC
50
= 78.1 mg/L
Linott 1992
MRID 42537401
Ward amd Boeri
1990
MRID 41607207
Ward and Boeri
1992b
MRID 42315102
Ward and Boeri
1989b
MRID 41510604
Blasberg et al. 1991
MRID 41885903
BASF 1982
1
MRID 00100536
Appendix 3-4