Maleic hydrazide sodium-Pesticide database

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Maleic hydrazide sodium

(Also known as: maleic hydrazide monosodium salt)

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
	Ecotoxicity Moderate alert: Fish chronic ecotoxicity: Moderate Warning: Significant data are missing	Human health High alert: Neurotoxicant

GENERAL INFORMATION

A plant growth regulator used to suppress growth and to induce dormancy in some crops

Example pests controlled

Growth; Suckers; Sprout suppression

Example applications

Lawns; Amenity turf; Non-cropped areas; Fruit including citrus; Potatoes; Carrots; Onions, shallots & garlic; Tobacco; Ornamental shrubs

Efficacy & activity

Availability status

Introduction & key dates

UK regulatory status

UK COPR regulatory status

Date COPR inclusion expires

UK LERAP status

EC Regulation 1107/2009 (repealing 91/414)

EC Regulation 1107/2009 status

Dossier rapporteur/co-rapporteur

Denmark/Belgium

Date EC 1107/2009 inclusion expires

EU Candidate for substitution (CfS)

Listed in EU database

Yes as hydrazide acid

Approved for use (✓) under EC 1107/2009 in the following EU Member States

ATAustria	BEBelgium	BGBulgaria	CYCyprus	CZCzech Republic	DEGermany	DKDenmark	EEEstonia	ELGreece
✓	✓			✓	✓	✓		✓
ESSpain	FIFinland	FRFrance	HRCroatia	HUHungary	IEIreland	ITItaly	LTLithuania	LULuxembourg
✓	✓	✓	✓	✓	✓	✓		✓
LVLatvia	MTMalta	NLNetherlands	PLPoland	PTPortugal	RORomania	SESweden	SISlovenia	SKSlovakia
			✓	✓		✓		✓

Approved for use (✓) under EC 1107/2009 by Mutual Recognition of Authorisation and/or national regulations in the following EEA countries

ISIceland	NONorway

Additional information

Chemical structure

Chemical formula

C₄H₃N₂NaO₂

Canonical SMILES

C(=CC(=O)[O-])C(=O)NN.[Na+]

Isomeric SMILES

C(=C\C(=O)[O-])\C(=O)NN.[Na+]

International Chemical Identifier key (InChIKey)

TZWQQLVMMAZOTJ-UHFFFAOYSA-M

International Chemical Identifier (InChI)

InChI=1S/C4H4N2O2.Na/c7-3-1-2-4(8)6-5-3;/h1-2H,(H,5,7)(H,6,8);/q;+1/p-1

2D structure diagram/image available?

Cambridge Crystallographic Data Centre diagrams

Common Name	Relationship	Link
maleic hydrazide	Parent

Plant Growth Regulator, Herbicide

Substance groups

Minimum active substance purity

Known relevant impurities

Substance origin

Suppresses sprout and bud growth, absorbed by leaves and roots and translocated. Enhances chlorophyll production.

US EPA chemical code

CLP index number

PIN (Preferred Identification Name)

sodium 6-oxo-1,6-dihydropyridazin-3-olate

sodium 6-oxo-1,6-dihydropyridazin-3-olate

1,2-dihydro-3,6-pyridazinedione sodium salt (1:1)

Other status information

Chemical subject to PIC regulations

Relevant Environmental Water Quality Standards

Herbicide Resistance Classification (HRAC)

Herbicide Resistance Classification (WSSA)

Insecticide Resistance Classification (IRAC)

Fungicide Resistance Classification (FRAC)

Examples of recorded resistance

White crystalline solid

Related substances & organisms

Example manufacturers & suppliers of products using this active now or historically

Example products using this active

Formulation and application details

Usually supplied in liquid formulations

ENVIRONMENTAL FATE

Source; quality score; and other information

Solubility - In water at 20 °C (mg l⁻¹)

Solubility - In organic solvents at 20 °C (mg l⁻¹)

Melting point (°C)

Boiling point (°C)

Degradation point (°C)

Flashpoint (°C)

Octanol-water partition coefficient at pH 7, 20 °C

Fat solubility of residues

Density (g ml⁻¹)

Dissociation constant pKa) at 25 °C

Vapour pressure at 20 °C (mPa)

Henry's law constant at 25 °C (Pa m³ mol⁻¹)

Maximum UV-vis absorption L mol⁻¹ cm⁻¹

Surface tension (mN m⁻¹)

Source; quality score; and other information

General biodegradability

Soil degradation (days) (aerobic)

DT₅₀ (typical)

DT₅₀ (lab at 20 °C)

DT₅₀ (field)

DT₉₀ (lab at 20 °C)

DT₉₀ (field)

DT₅₀ modelling endpoint

Dissipation rate RL₅₀ on plant matrix

Dissipation rate RL₅₀ on and in plant matrix

Aqueous photolysis DT₅₀ (days) at pH 7

Aqueous hydrolysis DT₅₀ (days) at 20 °C and pH 7

Water-sediment DT₅₀ (days)

Water phase only DT₅₀ (days)

Soil adsorption and mobility

Source; quality score; and other information

Notes and range

Notes and range

Source; quality score; and other information

GUS leaching potential index

SCI-GROW groundwater index (μg l⁻¹) for a 1 kg ha⁻¹ or 1 l ha⁻¹ application rate

Cannot be calculated

Potential for particle bound transport index

Potential for loss via drain flow

Bio-concentration factor

BCF (l kg⁻¹)

CT₅₀ (days)

Known soil metabolites

Major/Minor fraction

Estimated maximum occurrence fraction

Known groundwater metabolites

None

Other known metabolites

None

Terrestrial ecotoxicology

Source; quality score; and other information

Mammals - Acute oral LD₅₀ (mg kg⁻¹)

Q4 Q = Miscellaneous data from online sources
4 = Verified data

Mammals - Short term dietary NOEL

Mammals - Chronic 21d NOAEL (mg kg⁻¹ bw d⁻¹)

Birds - Acute LD₅₀ (mg kg⁻¹)

Q3 Q = Miscellaneous data from online sources
3 = Unverified data of known source

Anas platyrhynchos

Birds - Short term dietary (LC₅₀/LD₅₀)

Birds - Chronic 21d NOEL (mg kg⁻¹ bw d⁻¹)

Earthworms - Acute 14 day LC₅₀ (mg kg⁻¹)

Earthworms - Chronic NOEC, reproduction (mg kg⁻¹)

Soil micro-organisms

Acute LC₅₀ (mg kg⁻¹)

Chronic NOEC (mg kg⁻¹)

Non-target plants

Honeybees (Apis spp.)

Contact acute LD₅₀ (worst case from 24, 48 and 72 hour values - μg bee⁻¹)

Oral acute LD₅₀ (worst case from 24, 48 and 72 hour values - μg bee⁻¹)

Unknown mode acute LD₅₀ (worst case from 24, 48 and 72 hour values - μg bee⁻¹)

Bumblebees (Bombus spp.)

Contact acute LD₅₀ (worst case from 24, 48 and 72 hour values - μg bee⁻¹)

Oral acute LD₅₀ (worst case from 24, 48 and 72 hour values - μg bee⁻¹)

Mason bees (Osmia spp.)

Contact acute LD₅₀ (worst case from 24, 48 and 72 hour values - μg bee⁻¹)

Oral acute LD₅₀ (worst case from 24, 48 and 72 hour values - μg bee⁻¹)

Other bee species (1)

Acute LD₅₀ (worst case from 24, 48 and 72 hour values - μg insect⁻¹)

Mode of exposure

Other bee species (2)

Acute LD₅₀ (worst case from 24, 48 and 72 hour values - μg insect⁻¹)

Mode of exposure

Beneficial insects (Ladybirds)

Beneficial insects (Lacewings)

Beneficial insects (Parasitic wasps)

Beneficial insects (Predatory mites)

Beneficial insects (Ground beetles)

Aquatic ecotoxicology

Source; quality score; and other information

Fish - Acute 96 hour LC₅₀ (mg l⁻¹)

A4 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications )
4 = Verified data

Oncorhynchus mykiss

Fish - Chronic 21 day NOEC (mg l⁻¹)

A4 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications )
4 = Verified data

Pimephales promelas 32 day

Aquatic invertebrates - Acute 48 hour EC₅₀ (mg l⁻¹)

Aquatic invertebrates - Chronic 21 day NOEC (mg l⁻¹)

Aquatic crustaceans - Acute 96 hour LC₅₀ (mg l⁻¹)

Sediment dwelling organisms - Acute 96 hour LC₅₀ (mg l⁻¹)

Sediment dwelling organisms - Chronic 28 day NOEC, static, water (mg l⁻¹)

Sediment dwelling organisms - Chronic 28 day NOEC, sediment (mg kg⁻¹)

Aquatic plants - Acute 7 day EC₅₀, biomass (mg l⁻¹)

Algae - Acute 72 hour EC₅₀, growth (mg l⁻¹)

Algae - Chronic 96 hour NOEC, growth (mg l⁻¹)

Mesocosm study data

NOEAEC mg l⁻¹

NOEAEC mg l⁻¹

HUMAN HEALTH AND PROTECTION

Source; quality score; and other information

Threshold of Toxicological Concern (Cramer Class)

High (class III)

Mammals - Acute oral LD₅₀ (mg kg⁻¹)

Q4 Q = Miscellaneous data from online sources
4 = Verified data

Mammals - Dermal LD₅₀ (mg kg⁻¹ body weight)

Q3 Q = Miscellaneous data from online sources
3 = Unverified data of known source

Mammals - Inhalation LC₅₀ (mg l⁻¹)

Other Mammal toxicity endpoints

ADI - Acceptable Daily Intake (mg kg⁻¹ bw day⁻¹)

A5 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications )
5 = Verified data used for regulatory purposes

as maleic hydrazide

ARfD - Acute Reference Dose (mg kg⁻¹ bw day⁻¹)

A5 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications )
5 = Verified data used for regulatory purposes

AAOEL - Acute Acceptable Operator Exposure Level (mg kg⁻¹ bw day⁻¹)

AOEL - Acceptable Operator Exposure Level - Systemic (mg kg⁻¹ bw day⁻¹)

A5 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications )
5 = Verified data used for regulatory purposes

as maleic hydrazide

Dermal penetration studies (%)

Dangerous Substances Directive 76/464

Exposure Routes

No unacceptable risks to bystanders identified

No unacceptable risks to operators or other workers identified

EU MRL pesticide database

GB MRL Register

Drinking Water Standards

Drinking Water MAC (μg l⁻¹)

Mammalian dose elimination route and rate

Specific human health issues

Endocrine disruptor

XNo, known not to cause a problem

A3 A = Chromosome aberration (EFSA database)
3 = Negative

B0 B = DNA damage/repair (EFSA database)
0 = No data

C0 C = Gene mutation (EFSA database)
0 = No data

D0 D = Genome mutation (EFSA database)
0 = No data

E2 E = Unspecified genotoxicity type (miscellaneous data source)
2 = Mixed/ambiguous results

XNo, known not to cause a problem

Reproduction / development effects

Acetyl cholinesterase inhibitor

XNo, known not to cause a problem

XNo, known not to cause a problem

✓Yes, known to cause a problem

Respiratory tract irritant

Skin sensitiser

✓Yes, known to cause a problem

✓Yes, known to cause a problem

XNo, known not to cause a problem

✓Yes, known to cause a problem

XNo, known not to cause a problem

General human health issues

Potential liver toxicant
Possible mutagen
Ingestion might cause tremors and muscle spasms
IARC group 3 carcinogen

Handling issues

Value and interpretation

IMDG Transport Hazard Class 9
Not explosive or oxidising
Not expected to autoignite; Not highly flammable

CLP classification 2013

Health: H315, H319, H341, H335

WHO Classification

U (Unlikely to present an acute hazard)

Waste disposal & packaging

Packaging Group III (minor danger)

Shelf-life, storage, stability and reactivity

maleic hydrazide sodium

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