Paclobutrazol used in farm

Paclobutrazol is a triazole type plant growth retardant which blocks gibberellin biosynthesis and are involved in reducing abscisic acid, ethylene and indole-3-acetic acid while increasing cytokinin levels. It promotes fruit set in the states of inhibited development . It is also known that it protect plants against abiotic stresses. 

Uniconazol is another triazole type plant growth retardant. Though each plant hormone evokes many different specific biochemical, physiological, or morphological responses, the effects of different hormones overlap and may be stimulatory or inhibitory to regulate plant development and growth. 

Paclobutrazol(CAS NO:76738-62-0), it can be classified as the growth retardants, which can be sub-classified as gibberellin biosynthesis inhibitors or compounds which are not involved in inhibiting gibberellin biosynthesis. abscisic acid, cimetacarb, daminozide, dikegulac, maleic hydrazide, mefluidide, and morphologically active substances (morphactins: chlorfluren, chlorflurenol, dichlorflurenol, flurenol).

For Trees and Shrubs

Paclobutrazol(CAS NO:76738-62-0) is used by arborists to reduce shoot growth and has been shown to have additional positive effects on trees and shrubs. It is used to improve their resistance to drought stress, darker green leaves, higher resistance against fungi and bacteria, and enhanced development of roots. Cambial growth, as well as shoot growth, has been shown to be reduced in some tree species.

Paclobutrazol is absorbed by roots and stems, and to a lesser extent, by leaves. Therefore, it can be applied as a spray, sprench, drench, or bulb or young-plant dip. Sprays are more effective when they penetrate plant canopies so that there is contact with stems. Plants absorb paclobutrazol with 30 minutes, and so crops can be watered relatively soon after PGR application without losing efficacy. Once absorbed, the products have a fairly long residual effect, so they are often used on aggressive bedding plants and herbaceous perennials, as well as potted flowering plants such as poinsettia. In addition, paclobutrazol is used as a spray on some vigorous plug and liner crops, especially during periods of warm weather.

For Aggressive Crops

Early paclobutrazol applications are desirable once roots have reached the pot edges, typically seven to 10 days after transplant. Growers are encouraged to perform their own trials to determine appropriate rates for their growing conditions and specific crops. The effects are strongly recommended.

A wide range of paclobutrazol concentrations are used on floriculture crops. Factors that influence appropriate rates include the crop, the magnitude of the response desired, crop maturity, volume of application and growing climate. A paclobutrazol spray at 5 to 10 ppm can be appropriate for bedding plants with moderate vigor, whereas at least twice that may be needed for aggressive crops, especially when grown during the late spring. On aggressive herbaceous perennials, typical spray rates are 60 to 90 ppm. None of the products can legally be applied to vegetable or herb crops.


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