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Mepiquat Chloride


Synonyms: 1,1-dimethylpiperidinium Chloride (IUPAC); 'Bonvinot' (Lainco); 'Mepex' (DuPont); 'Pix' (BASF, Nufarm Ltd); 'Roquat' (Rotam); mixtures 'Terpal' (+ ethephon) (BASF, Bayer CropScience, DuPont). Other products 'PixUltra' (with borate additive) (BASF); 'Ponnax' (BASF); 'Ancla' (Afrasa); 'Chamatkar' (Gharda); 'Compact' (Winfield Solutions); 'Concorde' (Nufarm Ltd); 'Frastar' (Nippon Soda); 'Megahix' (Hekta351); 'Mepichlor' (Arysta LifeScience N. America); 'Mepstar' (Albaugh); 'Pix Plus' (with Bacillus cereus) (Arysta LifeScience N. America, BASF); 'Superix' (Doğal); 'Tac' (Cequisa); 'Vallix 5' (IQV); mixtures 'Cyclade' (+ chlormequat chloride + ethephon) (BASF); 'Médax' (+ prohexadione-calcium) (BASF); 'Stronghold' (+ chlormequat chloride) (BASF); 'Banshee' (+ ethephon) (Barclay); 'Cyter' (+ chlormequat chloride) (BASF, de Sangosse); 'Guilder' (+ ethephon) (Nufarm UK); 'Mepex Gin Out' (+ kinetin) (DuPont, Nufarm Ltd); 'Stance' (+ cyclanilide) (Bayer CropScience). Discontinued products 'MepPlus' * (with Bacillus cereus, strain Bp01) (Micro Flo); mixtures 'Mepex Plus-CP' * (+ 4-indol-3-ylbutyric acid + cytokinins + gibberellic acid) (DuPont); 'Terpitz' * (+ ethephon) (Me2).
CAS No.: 24307-26-4
EC No.: 246-147-6
Molecular Weight: 149.7
Molecular Formula: C7H16ClN
Structural Formula: Mepiquat Chloride
Form Colourless, odourless, hygroscopic crystals.
M.p. >300 °C V.p. <1 × 10-11 mPa (20°C)
Kow logP = –3.55 (pH 7)
Henry c. 3 × 10-17 Pa m3 mol-1 (20°C)
S.g./density 1.166 (room temperature)
Solubility In water >50% w/w (20°C). In methanol 48.7, n-octanol 0.962, acetonitrile 0.280, dichloromethane 0.051, acetone 0.002, toluene, n-heptane and ethyl acetate <0.001 (all in g/100 ml, 20 °C).
Stability Hydrolytically stable (30 d, pH 3, 5, 7 and 9, 25°C). Stable in artificial sunlight.


Mepiquat chloride inhibits the biosynthesis of gibberellic acid. Mode of action Plant growth regulator, absorbed and translocated throughout the plant. Used on cotton to reduce vegetative growth and to advance maturation of the bolls; and to inhibit sprouting in onions, garlic and leeks. Used in combination with ethephon to prevent lodging (by shortening the stem and strengthening the stem wall) in cereals, grass seed crops and flax. Typical application rates in cotton are up to 0.075 kg/ha, and in cereals up to 0.7625 kg/ha.


TC 99%; SL, various a.i. concentration

Standard Packaging

25kg/drum; 200L drum, 5L, 10L, 20L, 25Lcan, 1L bottle.

Packaging photos coming soon

Risks and Safety Information

Meqiquat Chloride is regulated by UN as Class 6 Toxic substance.

Acute oral LD50 for rats 270 mg/kg. Skin and eye Acute percutaneous LD50 for rats >1160 mg/kg. Not irritating to skin and eyes (rabbits). Not a skin sensitiser. Inhalation LC50 (7 h) for rats >2.84 mg/l air.

Warning, toxic!

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