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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