Prohexadione-calcium 
Action/Use:
- Plant Growth Regulator
Use:
Grass seed, peanuts, pome fruits; prevention of lodging in rice, wheat, and barley.
Identification
Common Name(s): Prohexadione-calcium (ISO, BSI, ISO draft)
Chemistry
Class: Cyclohexadione compound.
Properties: (Tech) Yellow powder with sweet smell. Melting point >360°C. Hardly soluble in organic solvents.
Registration
U.S.A.: Apogee* in grass seed, peanuts, and pome fruits.
Outside U.S.A.: Medax* in cereals; Regalis* in pome fruits.
Environmental Guidelines
Hazards: Fish: LC50 >150 ppm (carp), >100 ppm (rainbow trout). Bird: Oral LD50 >2000 mg/kg (bobwhite quail); Dietary Oral LC50 >5200 mg/kg (mallard duck). Bee: Topical LD50 >100 µg/bee (honeybee)
Water Solubility: 174.2 mg/l at 20°C
Safety Guidelines
Signal Word: CAUTION
Toxicity Class: III
Toxicity: (Rat): Oral LD50 >5000 mg/kg. Inhalation LC50 >4.21 mg/l. Dermal LD50 >2000 mg/kg
Handling/storage Cautions: Keep containers tightly closed and store in a cool, dark, and dry place. Keep away from oxidizing and alkaline materials, heat, steam pipes, and combustible materials. Keep out of reach of children. Avoid contact with mouth, skin, and eyes
Protective Clothing: Waterproof gloves. Chemical-resistant footwear plus socks. Protective eyewear. Approved respirator.
Suppliers and Branded Products
Basic Producers:
Formulators' Trade Names:
BASF Corporation (Apogee*, Baseline*, Regalis*)
Premix Products:
+ Mepiquat Chloride
- Medax* — BASF Corporation
