Maleic hydrazide

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;
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

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]

References

^ Schoene, D. L.; Hoffmann, O. L. (1949-06-10). "Maleic Hydrazide, a Unique Growth Regulant". Science. 109 (2841): 588–590. Bibcode:1949Sci...109..588S. doi:10.1126/science.109.2841.588-a. PMID 17835381.
^ Nooden, Larry D. (February 1969). "The Mode of Action of Maleic Hydrazide: Inhibition of Growth". Physiologia Plantarum. 22 (2): 260–270. doi:10.1111/j.1399-3054.1969.tb07375.x. hdl:2027.42/74891.
^ "Peer review of the pesticide risk assessment of the active substance maleic hydrazide". EFSA Journal. 14 (6). June 2016. doi:10.2903/j.efsa.2016.4492.
^ Buckley, Denis (August 2006). "Maleic Hydrazide in potato volunteer control" (PDF). British Potato Council. Retrieved 8 June 2021.
^ Cunnington, Adrian (May 2019). "Maleic hydrazide as a potato sprout suppressant" (PDF). AHDB Potatoes. Retrieved 8 June 2021.

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[1] Schoene, D. L.; Hoffmann, O. L. (1949-06-10). "Maleic Hydrazide, a Unique Growth Regulant". Science. 109 (2841): 588–590. Bibcode:1949Sci...109..588S. doi:10.1126/science.109.2841.588-a. PMID 17835381.

[2] Nooden, Larry D. (February 1969). "The Mode of Action of Maleic Hydrazide: Inhibition of Growth". Physiologia Plantarum. 22 (2): 260–270. doi:10.1111/j.1399-3054.1969.tb07375.x. hdl:2027.42/74891.

[3] "Peer review of the pesticide risk assessment of the active substance maleic hydrazide". EFSA Journal. 14 (6). June 2016. doi:10.2903/j.efsa.2016.4492.

[4] Buckley, Denis (August 2006). "Maleic Hydrazide in potato volunteer control" (PDF). British Potato Council. Retrieved 8 June 2021.

[5] Cunnington, Adrian (May 2019). "Maleic hydrazide as a potato sprout suppressant" (PDF). AHDB Potatoes. Retrieved 8 June 2021.

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