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Product Name

Paclobutrazol

Function

Plant Growth Regulator

Specification

95%Tech, 250 g/l SC, 15%WP

Chemical Name

(1a,2b,4aa,4bb,10b)-2,4a,7-trihydroxy-1-methyl-8-methylenegibb-3-ene-1,10-dicarboxylic acid 1,4a-lactone

CAS No.

76738-62-0

Empirical Formula

C15H20ClN3O

Chemical Formula of Active Ingredient

Toxicology

Oral Acute oral LD50 for male rats 2000, female rats 1300, male mice 490, female mice 1200, guinea pigs 400-600, male rabbits 840, female rabbits 940 mg/kg. 

Skin and eye Acute percutaneous LD50 for rats and rabbits >1000 mg/kg. Mild skin irritant; moderate eye irritant (rabbits). Not a skin sensitiser (guinea pigs). 

Inhalation LC50 (4 h) for male rats 4.79, female rats 3.13 mg/l air. 

NOEL (1 y) for dogs 75 mg/kg daily; (2 y) for rats 250 mg/kg diet. 

ADI (JMPR) 0.1 mg/kg b.w. [1988]. 

Other Not mutagenic. 

Toxicity class WHO (a.i.) III

Applications

Mode of action Plant growth regulator taken up into the xylem through the leaves, stems, or roots, and translocated to growing sub-apical meristems. Produces more compact plants and enhances flowering and fruiting.  Uses Used on fruit trees to inhibit vegetative growth and to improve fruit set; on pot-grown ornamentals and flower crops (e.g. chrysanthemums, begonias, freesias, poinsettias and bulbs) to inhibit growth; on rice to increase tillering, reduce lodging, and increase yield; on turf to retard growth; and on grass seed crops to reduce height and prevent lodging. To be applied as a foliar spray, as a soil drench, or by trunk injection. Has some fungicidal activity against mildew and rusts. Phytotoxicity Non-phytotoxic, though it intensifies greening. Some spotting has been noted on periwinkle foliage at higher temperatures.

Package

5L/Drum, 10KG/Carton, etc

 

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