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The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Ecotoxicological information

Toxicity to terrestrial plants

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Administrative data

Link to relevant study record(s)

Reference
Endpoint:
toxicity to terrestrial plants: short-term (with study design considered suitable for long-term assessment)
Type of information:
experimental study
Adequacy of study:
key study
Study period:
1990-09-01 - 1991-09-01
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 208 (Terrestrial Plants Test: Seedling Emergence and Seedling Growth Test)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Analytical monitoring:
no
Vehicle:
yes
Species:
Avena sativa
Plant group:
Monocotyledonae (monocots)
Species:
Brassica rapa
Plant group:
Dicotyledonae (dicots)
Test type:
seedling emergence toxicity test
Study type:
laboratory study
Substrate type:
natural soil
Limit test:
no
Total exposure duration:
14 d
Test temperature:
ca. 20°C
pH:
6.5
Nominal and measured concentrations:
Nominal:
20, 40, 80, 160, 320 mg/kg soil (d.w.)
Reference substance (positive control):
yes
Remarks:
Trichloracetic acid
Key result
Species:
Avena sativa
Duration:
14 d
Dose descriptor:
EC50
Effect conc.:
137.7 mg/kg soil dw
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
phytotoxicity
Key result
Species:
Avena sativa
Duration:
14 d
Dose descriptor:
NOEC
Effect conc.:
20 mg/kg soil dw
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
phytotoxicity
Key result
Species:
Brassica rapa
Duration:
14 d
Dose descriptor:
EC50
Effect conc.:
90.1 mg/kg soil dw
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
phytotoxicity
Key result
Species:
Brassica rapa
Duration:
14 d
Dose descriptor:
NOEC
Effect conc.:
20 mg/kg soil dw
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
phytotoxicity
Key result
Species:
Brassica rapa
Duration:
14 d
Dose descriptor:
LOEC
Effect conc.:
320 mg/kg soil dw
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
phytotoxicity
Validity criteria fulfilled:
yes
Conclusions:
Monocot:
EC50: 137.7 mg/kg soil
NOEC: 20 mg/kg soil

Dicot:
EC50: 90.1 mg/kg soil
NOEC: 20 mg/kg soil
LOEC: 320 mg/kg soil
Executive summary:

The effect of 3-Methylpyrazol on the seedling emergence and vegetative vigour of monocot Avena sativa and dicot Brassica rapa crops was studied at nominal concentrations of 20, 40, 80, 160 and 320 mg a.i./kg soil. The growth medium used in the seedling emergence and vegetative vigour test was natural soil. On day 14, the surviving plants per pot were recorded and cut at soil level for measuring the plant fresh weight in the seedling emergence and vegetative vigour test, respectively.

The NOEC based on phytotoxic effects was 20 mg a.i./kg soil for Avena sativa and Brassica rapa.

Description of key information

Chronic toxicity to Brassics rapa


It is assumed to cover a sensitive stage in the life-cycle of a plant and therefore data obtained from this  study have been used as estimates of chronic toxicity.

Key value for chemical safety assessment

Short-term EC50 or LC50 for terrestrial plants:
90.1 mg/kg soil dw
Long-term EC10, LC10 or NOEC for terrestrial plants:
20 mg/kg soil dw

Additional information