CAS 76738-62-0 corresponds to Paclobutrazol, a triazole plant growth regulator that inhibits gibberellin synthesis to achieve crop dwarfism, control flowering, promote flowering, and enhance stress resistance. It also has certain fungicidal activity.

Core Basic Information
-Chinese name: Paclobutrazol
-English name: Paclobutrazol
-Chemical name: (2RS, 3RS) -1- (4-chlorophenyl) -4,4-dimethyl-2- (1H-1,2,4-triazol-1-yl) pentan-3-ol
-Molecular formula: C ₁₅ H ₂₀ ClN ∝ O
-Molecular weight: 293.79
-Appearance: White or off white crystalline solid
-Melting point: 165-166 ℃
-Solubility: Difficult to dissolve in water (about 26-35 mg/L), easily soluble in organic solvents such as methanol, acetone, dichloromethane, etc
-Toxicity classification: moderate toxicity (oral LD ₅₀ in rats is approximately 1300-2000 mg/kg)
-UN number: UN1325 (Class 4.1 flammable solid)

Main mechanism of action and application
1. Growth regulation: Inhibits endogenous gibberellin biosynthesis, shortens internodes, dwarves plants, promotes tillering and flower bud differentiation.
2. Stress resistance enhancement: increase chlorophyll content, enhance drought resistance, cold resistance, lodging resistance, and disease resistance.
3. Applicable crops: rice, wheat, fruit trees (apples, mangoes, lychees, etc.), vegetables, peanuts, cotton, etc.
4. Application methods: foliar spraying, soil treatment, seed soaking or seed mixing; The medicinal effect is long-lasting, and the residual period in soil can reach 0.5-1 year.
5. It also has antibacterial properties: it has a certain inhibitory effect on wheat powdery mildew, rice sheath blight, rapeseed sclerotinia rot, etc.

Precautions
-Residual risk: Slow degradation in soil can easily affect subsequent crops, and strict control of residues is required for exported vegetables (with a limit of 0.01 ppm or “not detectable” in many countries).
-Drug damage relief: When excessive use leads to excessive dwarfism, nitrogen fertilizer can be applied or gibberellin can be sprayed to alleviate it.
-Prohibited scenario: It is usually prohibited to use in green food production standards.

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Paclobutrazol CAS 76738-62-0
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