Quali-Pro Pac-Low Tree Growth Regulator

Quali-Pro Pac-Low Plant Growth Regulator Label (PDF)

Quali-Pro Pac-Low Plant Growth Regulator SDS (PDF)

Quali-Pro Pac-Low 2C is a xylem mobile plant regulator that slows vegetative growth as well as creating other physiological effects by inhibiting gibberellin biosynthesis. This product reduces the above ground vegetative growth and changes specific morphological characteristics of the plant. This product is most effective when applied to the soil near the base of the tree either by soil injection or with basal soil drench.

This product can be used on listed trees found in such areas as urban environments, utility rights-of-way, residential areas and other non-crop areas.

The activity of this product occurs following root uptake and xylem translocation throughout the tree canopy. This occurs within a few weeks, although maximum growth inhibition may not be fully visible for up to 18 months following application.  Initial effects of this product may be observed as intense greening of the foliage with no phytotoxicity. Trees treated with this product will exhibit shorter internodes, a reduction in the diameter growth of the main stem wood, thicker leaf cuticles, and an increase in fine root growth in some species. Smaller leaf size and enhanced flowering may also be observed in some species.

Application Methods (Please carefully read and follow the label)

This product may be applied as a basal drench or by soil injection. Application should be made as close to the tree and the soil interface as possible to obtain the most consistent results. ·

Basal Drench

Prior to application, make a 2” deep furrow around the base of the tree near the point of contact between the soil and the tree trunk. Apply the required dose [see Table 1 on the label for rates based on tree size and species]. The diluted mixture of this product may be carefully poured into the furrow around the tree trunk with a graduated container/jug or with a handheld hose connected to a truck-mounted tank/hydraulic sprayer. After applying, refill the furrow with untreated soil to avoid possible ground runoff.

Soil Injection

The diluted mixture of this product should be injected approximately 3 inches to 6 inches deep. Use injection equipment capable of delivery at 60-150 psi. Injection orifices should be oriented to release the diluted product horizontally at the point of injection. The required dose should be divided evenly among injection sites spaced as uniformly as possible around the tree trunk. The injection sites should be positioned to release the this product diluted mixture as close as possible to the point of contact between the soil and the tree beneath the soil so that the active ingredient may be readily absorbed by the tree. Injection sites should also be located next to buttress roots. For trees less than 6 inches DBH, use at least 4 evenly spaced injection sites per tree.

Application Timing

Applications can be made throughout the year, weather permitting, except when the soil is frozen or saturated with water. Note: this product is absorbed by plant roots and translocated to the growing tissues in response to evaporative water loss (transpiration). If applications are made after fall leaf drop, uptake of this product will not occur until development of new leaves in the spring and resumption of evaporative water loss.

Mixing Procedures

When mixing large amounts of this product, use a suspension aid to improve suspension of the diluted mixture at a rate of approximately ½ pint to 2 pints per 100 gallons. To re-suspend a solution that has settled, use 1 to 2 pints of a suspension aid per 100 gallons. Follow all label directions and precautions on the product label of the suspension aid. If applying mixture to compacted soils, high clay content soils, or other hard-to-wet soils, use a nonionic, organosilicone wetting agent (surfactant) to increase penetration of the soil. Mix approximately ½ ounce surfactant per 3 gallons or 1 pint surfactant per 100 gallons. Follow all label directions and precautions on the product label.

Active Ingredients:  22.9% Paclobutrazol

EPA Number:  53883-519