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  CHEMICAL: Flurprimidol
SPECIMEN LABEL (60KB PDF)
SUPPLEMENTAL BULLETIN (48KB PDF)
MSDS (72KB PDF)
 

For regulation of shoot growth and overall canopy growth of a wide variety of ornamental trees. For use by professional arborists/applicators, grounds maintenance professionals, city foresters, electric utility foresters/contractors and landscapers.
 
 
 Mastiff is ideal for trees
• 
 Planted too close together
• 
 Too close to homes, decks
• 
 Along scenic lines of sight
• 
 Near utility and power lines
• 
 Along sidewalks or in vaults
 
 
  Boost Tree Health
 

Mastiff condenses shoot elongation and stimulates root development. This increases root-to-crown ratio which can increase stress resistance and speed recovery from stress brought on by drought, pollution, and
temperature extremes.
 
 Mastiff provides beneficial tree growth
reduction and lets you:
• 
 Reduce growth where trees are planted
too close together or in tightly landscaped areas.
 • 
 Manage growth of trees planted too
close to homes, decks, foundations,
or other structures.
• 
 Maintain scenic view with less trimming.
 • 
 Manage size and improve vitality of trees
in vaults, along sidewalks, in parking
lots, or in interior spaces.
 • 
 Extend trimming cycles, reducing labor
time and expenses.
•  
 Stimulate fibrous root systems.
 • 
 Improve vitality in overly mature trees
or those in mild decline.
 
  Ingredients
 
Active: Flurprimidol*
(CAS No. 56425-91-3)
48.1%
Other Ingredients 51.9%
Total 100.0%
* α-(1-methylethyl)-α-[4-(trifluromethoxy) phenyl]-5-pyrimidinemethanol

Contains 2.3 fl oz (65.6 grams) active ingredient per 4 fl oz (120 ml) bottle.
  EPA Reg. No. 67690-34-69117
EPA Est. 69117-NE
 
  Application Rate
 

Inject 1 ml every 4" around the base (flare) of the tree. Dosage may be increased to 2 ml per injection site for trees with diameters over 12".

Higher or lower dosages are recommended for selected species. See the Supplemental Species Rate Chart (48KB PDF) for details.

   
  Links
  Mastiff PGR Information Sheet
   
 

 
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  Manage Tree Growth
  Mastiff PGR is a plant growth regulator (PGR) which produces desirable growth reduction in a wide variety of ornamental trees. With a single Mastiff PGR application, vegetative growth generally is reduced by 40% to 70% over a three-year period. Results will vary depending upon tree species and local growing conditions.
 
 
 
  Ideal fof Municipal and Utility Corridor Trees
• 
 Under or near utility and power lines
• 
 Along rights-of-way
• 
 Near intersections or streetlights
• 
 Along scenic corridors
• 
 Where undergrowth limits signage visibility
 
 
 
 
Mastiff helps utility and ROW managers extend trimming cycles, reducing trimming in dangerous areas, and decrease vegetation-related power outage risks in utility corridors.

Mastiff helps municipal arborists maintain scenic views, control lines of sight near intersections, and keep signage visible in retail areas.
 
  Timing of Mastiff Injections
  Shoot growth is most common between April and June. Mastiff PGR applications made prior to shoot growth, either in early spring or the preceding fall, provide more first-year growth control than applications made at other times. Late spring, summer, or fall applications will provide growth reduction the following year. Regardless of application timing, growth reduction within the first year after treatment may not be as noticeable as in subsequent years. A single Mastiff PGR application provides tree growth regulation for approximately three years. Do not apply more than once every three years.
 
  Notice of Warranty
  ArborSystems warrants that this product conforms to the chemical description on the label and is reasonably fit for use under average conditions when used strictly in accordance with the directions on the labeling. ArborSystems does not make or authorize any agent or representative to make any other warranty, guarantee or representation, expressed or implied, concerning this product.