Pyributicarb is a monothiocarbamic ester used as a herbicide which also demonstrates some fungicidal activity. It is used for the control of grasses in rice paddy fields. It is almost insoluble in water and is not persistent in paddy fields with a half-life of 13-18 days. It is highly toxic to aquatic organisms. It does not appear to be highly toxic to mammals but may be an irritant.
Data alerts
The following alerts are based on the data in the tables below. An absence of an alert does not imply the substance has no implications for human health, biodiversity or the environment but just that we do not have the data to form a judgement.
Environmental fate
Ecotoxicity
Human health
Environmental fate Moderate alert: Drainflow: Slightly mobile
Sterol biosynthesis inhibitor. Systemic, absorbed by the roots, leaves and stem and translocated to active growth sites where it inhibits elongation of the roots and aerial parts.
Example manufacturers & suppliers of products using this active now or historically
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Example products using this active
Seezet Flowable
Opryzaguard
Formulation and application details
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ENVIRONMENTAL FATE
Property
Value
Source; quality score; and other information
Interpretation
Solubility - In water at 20 °C (mg l⁻¹)
0.32
Q3 Q = Miscellaneous data from online sources 3 = Unverified data of known source
Low
Solubility - In organic solvents at 20 °C (mg l⁻¹)
28000
Q3 Q = Miscellaneous data from online sources 3 = Unverified data of known source
Methanol
-
780000
Q3 Q = Miscellaneous data from online sources 3 = Unverified data of known source
Acetone
-
33000
Q3 Q = Miscellaneous data from online sources 3 = Unverified data of known source
Ethanol
-
560000
Q3 Q = Miscellaneous data from online sources 3 = Unverified data of known source
Ethyl acetate
-
Melting point (°C)
86
Q3 Q = Miscellaneous data from online sources 3 = Unverified data of known source
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Boiling point (°C)
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-
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Degradation point (°C)
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-
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Flashpoint (°C)
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-
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Octanol-water partition coefficient at pH 7, 20 °C
P
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Log P
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-
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Fat solubility of residues
Solubility
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-
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Data type
-
-
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Density (g ml⁻¹)
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Dissociation constant pKa) at 25 °C
-
-
-
-
Vapour pressure at 20 °C (mPa)
0.269
Q3 Q = Miscellaneous data from online sources 3 = Unverified data of known source
at 40 °C
Low volatility. If applied directly to plants, drift is a concern & mitigation is advisable
Henry's law constant at 25 °C (Pa m³ mol⁻¹)
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Volatilisation as max % of applied dose lost
From plant surface
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From soil surface
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Maximum UV-vis absorption L mol⁻¹ cm⁻¹
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Surface tension (mN m⁻¹)
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Degradation
Property
Value
Source; quality score; and other information
Interpretation
General biodegradability
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Soil degradation (days) (aerobic)
DT₅₀ (typical)
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DT₅₀ (lab at 20 °C)
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DT₅₀ (field)
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DT₉₀ (lab at 20 °C)
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DT₉₀ (field)
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DT₅₀ modelling endpoint
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Note
General literature: soil half life in paddy fields 13-18 days
Dissipation rate RL₅₀ (days) on plant matrix
Value
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Note
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Dissipation rate RL₅₀ (days) on and in plant matrix
Value
-
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Note
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Aqueous photolysis DT₅₀ (days) at pH 7
Value
-
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Note
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Aqueous hydrolysis DT₅₀ (days) at 20 °C and pH 7
Value
-
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Note
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Water-sediment DT₅₀ (days)
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-
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Water phase only DT₅₀ (days)
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Air degradation
As this parameter is not normally measured directly, a surrogate measure is used: ‘Photochemical oxidative DT₅₀’. Where data is available, this can be found in the Fate Indices section below.
Decay in stored produce DT₅₀
-
Soil adsorption and mobility
Property
Value
Source; quality score; and other information
Interpretation
Linear
Kd (mL g⁻¹)
-
Q3 Q = Miscellaneous data from online sources 3 = Unverified data of known source
Slightly mobile
Koc (mL g⁻¹)
1885
Notes and range
General literature
Freundlich
Kf (mL g⁻¹)
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Kfoc (mL g⁻¹)
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1/n
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Notes and range
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pH sensitivity
-
Fate indices
Property
Value
Source; quality score; and other information
Interpretation
GUS leaching potential index
-
-
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SCI-GROW groundwater index (μg l⁻¹) for a 1 kg ha⁻¹ or 1 l ha⁻¹ application rate
Value
Cannot be calculated
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Note
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Potential for particle bound transport index
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Potential for loss via drain flow
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-
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Photochemical oxidative DT₅₀ (hrs) as indicator of long-range air transport risk
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Bio-concentration factor
BCF (l kg⁻¹)
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CT₅₀ (days)
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Known metabolites
None
ECOTOXICOLOGY
Terrestrial ecotoxicology
Property
Value
Source; quality score; and other information
Interpretation
Mammals - Acute oral LD₅₀ (mg kg⁻¹)
> 5000
Q3 Q = Miscellaneous data from online sources 3 = Unverified data of known source
Rat
Low
Mammals - Short term dietary NOEL
(mg kg⁻¹)
-
-
-
(ppm diet)
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-
Mammals - Chronic 21d NOAEL (mg kg⁻¹ bw d⁻¹)
-
-
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Birds - Acute LD₅₀ (mg kg⁻¹)
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Birds - Short term dietary (LC₅₀/LD₅₀)
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Birds - Chronic 21d NOEL (mg kg⁻¹ bw d⁻¹)
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Earthworms - Acute 14 day LC₅₀ (mg kg⁻¹)
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Earthworms - Chronic NOEC, reproduction (mg kg⁻¹)
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Soil micro-organisms
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Collembola
Acute LC₅₀ (mg kg⁻¹)
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Chronic NOEC (mg kg⁻¹)
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Non-target plants
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Honeybees (Apis spp.)
Contact acute LD₅₀ (worst case from 24, 48 and 72 hour values - μg bee⁻¹)
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Oral acute LD₅₀ (worst case from 24, 48 and 72 hour values - μg bee⁻¹)
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Unknown mode acute LD₅₀ (worst case from 24, 48 and 72 hour values - μg bee⁻¹)
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-
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Chronic
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Bumblebees (Bombus spp.)
Contact acute LD₅₀ (worst case from 24, 48 and 72 hour values - μg bee⁻¹)
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-
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Oral acute LD₅₀ (worst case from 24, 48 and 72 hour values - μg bee⁻¹)
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-
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Mason bees (Osmia spp.)
Contact acute LD₅₀ (worst case from 24, 48 and 72 hour values - μg bee⁻¹)
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-
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Oral acute LD₅₀ (worst case from 24, 48 and 72 hour values - μg bee⁻¹)
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-
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Other bee species (1)
Acute LD₅₀ (worst case from 24, 48 and 72 hour values - μg insect⁻¹)
-
-
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Mode of exposure
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Other bee species (2)
Acute LD₅₀ (worst case from 24, 48 and 72 hour values - μg insect⁻¹)
-
-
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Mode of exposure
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Beneficial insects (Ladybirds)
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-
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Beneficial insects (Lacewings)
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Beneficial insects (Parasitic wasps)
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Beneficial insects (Predatory mites)
-
-
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Beneficial insects (Ground beetles)
-
-
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Aquatic ecotoxicology
Property
Value
Source; quality score; and other information
Interpretation
Temperate Freshwater Fish - Acute 96 hour LC₅₀ (mg l⁻¹)
> 11.0
Q3 Q = Miscellaneous data from online sources 3 = Unverified data of known source
Oncorhynchus mykiss
Moderate
Temperate Freshwater Fish - Chronic 21 day NOEC (mg l⁻¹)
-
-
-
Tropical Freshwater Fish - Acute 96 hour LC₅₀ (mg l⁻¹)
Lewis, K.A., Tzilivakis, J., Warner, D. and Green, A. (2016) An international database for pesticide risk assessments and management. Human and Ecological Risk Assessment: An International Journal, 22(4), 1050-1064. DOI: 10.1080/10807039.2015.1133242
Environmental fate
Warning:
Human health
