Shortstop 2SC Plant Growth Regulator

Shortstop 2SC Plant Growth Regulator

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Product Overview

Shortstop 2SC is a systemic plant growth regulator (PGR) formulated with 22.3% paclobutrazol that aids to slow above-ground vegetative growth in trees and shrubs. Inhibits gibberellin biosynthesis to shorten the length between internodes of branches. Increases the root production to reduce pruning and improve drought tolerance. Alters the leaf physiology that may help the plant survive pest infestations and prevent water loss in hot, dry weather. Improves root structure to optimize water and nutrient transfer from the soil, lowering stress and the effects of building damage. Produces more chlorophyll to improve energy efficacy and to create attractive deep green foliage for overall appearance. Available in a 1-gallon jug.

Features and Specs

Active Ingredient Paclobutrazol - 22.3%
For use in Elm, Maple, Oak, Boxwood, Burning Bush, Rhododendron, and more trees and shrubs that are listed on the label.
Application See the product label for the complete application instructions.
Pet safe Yes, if used as directed on the label.
Yield One gallon of Shortstop 2SC will make 12 gallons of diluted mixture.
Formulation Liquid Concentrate.
NOT FOR SALE TO AK, CA, DC, ME, ND
Dimensions 6.00 x 5.00 x 7.00 inches.
Special Features Aids tree survival and halts defoliation during water shortage due to severe drought.
Shipping Weight 10.00 lbs
Manufacturer Arborjet (Mfg. Number: 040-1200)

Details

FEATURES:

  • Less time spent shearing and shaping
  • Reduces debris and disposal costs
  • Reduces pruning frequency
  • Increases drought resistance
  • Increases disease suppression
  • Improved overall appearance

BENEFITS:

  • Redistributed Energy - reduces pruning and improves drought tolerance
  • Enhanced Root Hair Growth - improves translocation of water and nutrients found in the soil
  • Reduced Production of Gibberellic Acid - shortens the length between internodes of branches and 80-95% less annual branch growth
  • Increased Production of Abscisic Acid - prevents water loss to aid in drought stress management and top-growth production
  • Increased Production of Chlorophyll - increases energy optimization and attractive deep green foliage

USE DIRECTIONS

Controlling the Growth of Trees
Application Timing

  • Applications can be made throughout the year, weather permitting, except when soil is either saturated with water or frozen. Note: Shortstop 2SC is absorbed by plant roots and translocated to the growing tissues in response to evaporative water loss (transpiration). If applications of Shortstop 2SC are made after fall leaf drop, uptake will not occur until the development of new leaves in the spring and resumption of transpiration.

Mixing Directions

  • Applications are made with a diluted mixture composed of one part Shortstop 2SC to 11 parts water. Mix 10.7 fl oz (317 mL) of Shortstop 2SC with water to make one gallon of diluted mixture. One gallon of Shortstop 2SC will make 12 gallons of diluted mixture.

Application Methods

  • Apply Shortstop 2SC either as a basal drench or by soil injection. Only trees that are well established in their final location should be treated with Shortstop 2SC. Do not treat trees less than 1.5 inches in diameter at breast height. Note: Application rates for trees from 1.5 to 3.9 inches in DBH should be reduced by 50% for use rates of 0.75 - 2.5 grams per inch and by 25% for use rates of 2.75 - 4.0 grams per inch DBH. Diameter at breast height, or DBH, is a standard method of expressing the diameter of the trunk of a standing tree. Tree trunks are measured at the height of an adult’s breast, which is generally defined as a height of 4.5 feet above the ground. Trunk diameter (the distance through the center of the trunk from one side to the other) can be determined precisely by using a caliper, or by using a measuring tape to determine the circumference (the linear distance around the surface of the tree). The trunk diameter can then be calculated by dividing the circumference of the trunk by 3.142. Example: 25 inch circumference / 3.142 = 8 inch diameter.

Basal Drench

  • Shortstop 2SC may be applied to the soil as a basal drench to reduce above-ground vegetative growth. Apply the required dose of a diluted mixture of Shortstop 2SC based on the tree size (Diameter at Breast Height; DBH) and species. Prior to application, make a 2 - 5 inches deep furrow around the base of the tree near the point of contact between the soil and the tree trunk. Apply the required dose. Carefully pour the diluted mixture of Shortstop 2SC into the furrow with a graduated container/jug or with a handheld hose connected to a truck-mounted tank/hydraulic sprayer. To avoid possible product runoff after applying, refill the furrow with untreated soil.

Soil Injection

  • Inject the diluted mixture of Shortstop 2SC into the root zone, approximately 6 inches deep. Use soil injection equipment capable of delivery at 100 to 200 psi. Orient injection orifices to release the diluted product horizontally at the point of injection. Divide the required dose evenly among injection sites spaced as uniformly as possible around the tree trunk. Position the injection sites to release Shortstop® 2SC diluted mixture as close as possible to the point of contact between soil and unthickened bark beneath the soil so that the active ingredient may be readily absorbed by the tree. Locate injection sites next to buttress roots. For trees, less than 6 inches DBH, use at least 4 evenly spaced injection sites per tree.

Controlling the Growth of Woody Shrubs
Soil Injection/Basal Drench

  • Soil injections or basal drenches of Shortstop 2SC are an effective tool for controlling the growth of woody shrubs in landscape settings. The growth control is approximately 90% and lasts for 1 - 2 years, depending on the length of the growing season. Applications are made with a diluted mixture composed of 1 part Shortstop 2SC to 11 parts water. Mix 10.7 fl oz (317 mL) of Shortstop 2SC with water to make one gallon of diluted mixture. One gallon of Shortstop® 2SC will make 12 gallons of diluted mixture.
  • Identify the shrub species and calculate the size of the “shrub crown”.
    • The size (or volume) of the “shrub crown” is calculated by using the volume formula L x W x H (in feet).
    • When measuring crown volume, include only significant branches. Do not include stems or the trunk in the volume calculations if it is not within the crown itself.
    • Determine how much Shortstop 2SC diluted mixture should be used on the selected woody shrubs. Match the total shrub volume in cubic feet with the volume amounts in Table 3 to determine the total volume. If the amount needed is found to be between two volumes, select either the average of the two volumes or the higher of the two volumes.

Basal Drench

  • Prior to application, dig a shallow furrow 2 - 6 inches deep around the base of the tree near the point of contact between the soil and the tree trunk. Carefully pour the diluted mixture of Shortstop 2SC evenly around the tree into the furrow with a graduated container/jug or with a hand-held hose connected to a truck-mounted tank/ hydraulic sprayer. To avoid possible product runoff after applying, refill the furrow with untreated soil. Restriction: Do not apply product to the soil when soil is already saturated. Heavy rainfall or irrigation in treated areas may cause the active ingredient to move laterally on slopes and collect in low areas. These areas may undergo more severe growth control for a longer period of time.

Soil Injection

  • Inject the Ready to Use solution approximately 2 - 6 inches deep at 50 - 200 psi using the volumes in Table 3. Orient injection orifices to release the diluted product horizontally at the point of injection. Divide the required dose evenly among injection sites spaced as uniformly as possible around the base of the tree. Position the injection sites to release the diluted Shortstop 2SC as close as possible to the point of contact between the soil and the plant beneath the soil so that the solution is readily absorbed by the roots. Use at least 4 injection sites evenly spaced around the plant.

Notes for Woody Shrubs Soil Applications

  • Newly planted or containerized shrubs need only 60% of the prescribed volume. For single stem applications, place the product closely around the shrub base. For multiple stem applications, place the product close around the base and within stem groupings. Intermittent trimming to keep a tight formal appearance will not remove enough product to lose growth control in most shrubs. To limit unwanted surface runoff in outdoor ornamental uses, do not apply when growth media is saturated.

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