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How does PENTRA-BARK work?

All woody plants have microscopic openings in the exterior protective bark periderm layer called lenticels. These lenticels are functionally used for plant transpiration and pressure regulation.  Lenticels connect directly to the plant’s annual spiral openings or vascular metabolic transport system contained in the plant’s cambial phelloderm.

When PENTRA-BARK is applied to the woody bark periderm in combination with systemic pesticides it opens the lenticels and enables movement through the lenticels into the plant’s vascular transport system.


Trials with PENTRA-BARK

In the trial below, an inert dye was mixed with 3 oz. of PENTRA-BARK per gallon of water and applied onto the tree trunk with the basal bark application method.

The tree was dissected and examined 7 days after application. The inert dye had penetrated into the center of the tree within 7 days and the inert dye had also been transported throughout the tree’s vascular system as evidenced by the dye being found 24 feet up into the canopy of the tree. Translocation of systemic pesticides primarily occurs in the cambial zone.



Application Rates

Pentra-Bark should be used at 1% of the spray volume solution or 3 oz. per gallon of spray solution.


DBH       Smooth Bark Rough Bark                 
6" <1 pint 1 pint
12" 1 quart 1.5 quarts
18" 2 quarts 2.5 quarts
24" 2.5 quarts 3 quarts


Apply solution until saturation runoff occurs.  DBH measured at 4.5 feet from ground level.  Rough bark requires more solution for treatment.






$ 340