Maleic hydrazide

Maleic hydrazide, often known by the brand name Fazor, is a plant growth regulator that reduces growth through preventing cell division but not cell enlargement.^[1][2] It is applied to the foliage of potato, onion, garlic and carrot crops to prevent sprouting during storage.^[3] It can also be used to control volunteer potatoes that are left in the field during harvesting.^[4] It was first identified in the 1940s but was not used commercially in the United Kingdom until 1984. The banning of chlorpropham as a sprout suppressant in 2019 has led renewed interest in how maleic hydrazide can be used in potatoes.^[5]

Maleic hydrazide

Names
IUPAC name 1,2-dihydropyridazine-3,6-dione
Identifiers
CAS Number	123-33-1
3D model (JSmol)	Interactive image
ChEBI	CHEBI:81771
ChEMBL	ChEMBL1489913
ChemSpider	20632
ECHA InfoCard	100.004.201
EC Number	204-619-9
KEGG	C18474
PubChem CID	21954
RTECS number	UR5950000
UNII	TQ7L3FCV66
UN number	3082 3077
CompTox Dashboard (EPA)	DTXSID9020792
InChI InChI=1S/C4H4N2O2/c7-3-1-2-4(8)6-5-3/h1-2H,(H,5,7)(H,6,8) Key: BGRDGMRNKXEXQD-UHFFFAOYSA-N
SMILES C1=CC(=O)NNC1=O
Properties
Chemical formula	C4H4N2O2
Molar mass	112.088 g·mol−1
Density	1.6 g/cm3
Melting point	296–298 °C (decomposes)
Hazards
GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H315, H319, H335, H341
Precautionary statements	P201, P202, P261, P264, P271, P280, P281, P302+P352, P304+P340, P305+P351+P338, P308+P313, P312, P321, P332+P313, P337+P313, P362, P403+P233, P405, P501
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references