Common name paclobutrazol (BSI, draft E-ISO, (m) draft F-ISO, ANSI)
IUPAC name (2RS, 3RS)-1-(4-chlorophenyl)-4, 4-dimethyl-2-(1H-1, 2, 4-triazol-1-yl)pentan-3-ol
Chemical Abstracts name (R*, R*)-(? -b-[(4-chlorophenyl)methyl]-a-(1, 1-dimethylethyl)-1H-1, 2, 4-triazole-1-ethanol
CAS RN [76738-62-0] stated stereoisomers
Biochemistry Inhibits gibberellin biosynthesis by inhibition of the conversion of ent-kaurene to ent-kaurenoic acid, and inhibits sterol biosynthesis by inhibition of demethylation; hence inhibits the rate of cell division.
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.
10ML ~200L for liquid formulations, 1G~25KG for solid formulations.