MEANS EVEN AND COMPLETE DISTRIBUTION
Equipment and formulations only get you so far. Proper application is critical for achieving complete, fast distribution and ensuring predictable results when protecting trees. The ISA’s Tree Injection Best Management Practices guide highlights root flare application and proper drilling as fundamentals for success. Here are some ways to put that to work for you:
Optimal injection zone: Root Flares
There are several reasons why injecting into the root flare is recommended:
- Root flares have a greater ability to ‘heal’ (CODIT) from tree injection wounds versus trunk tissue.
- The root flare is made up of significantly more active xylem (sapwood). This provides faster uptake and enhanced distribution of the product throughout the trunk and canopy.
- Sideways movement of product is greater in the root flare than in trunk tissue, resulting in more even crown distribution.
PIGTAILS – Here’s a tip: a sharp bit drilled into healthy tissue will make a wood “pigtail”. When you stop making pigtails, change drill bits to ensure you are making clean cuts.
These guidelines apply regardless of the tree injection device that is used
Inject into the root flare. Go as low as you can if the flares are not accessible.
Keep It Clean
Use a stiff brush to clean dirt and debris off the bark prior to drilling.
Use only razor-sharp, high-helix drill bits. Replace the bits every 5-10 trees.
Not Too Deep
Drilling past the active xylem tissue can cause unnecessary wounding.
That can affect uptake
Different species of trees have different tissue structures that can greatly affect uptake. As a general rule, ring porous trees are faster to inject than diffuse porous trees.
Both drought conditions and water-logged soils can decrease uptake time. In dry conditions, properly irrigate a tree prior to injection for faster uptake.
Trees growing in stressful conditions often respond by growing thinner layers of new xylem tissue, which can slow down uptake time.
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