Into which part of the tree should injections be placed?

Into which part of the tree should injections be placed?

• A. Inner heartwood only
• B. Outer bark surface
• C. Outer sapwood only
• D. Random trunk locations

Answer: (C)

When injecting a systemic pesticide, you want to deliver it into the tree’s living vascular tissue so it can move throughout the plant. The outer sapwood is the living conduction zone (xylem) that transports water and dissolved substances from roots to the canopy, so injections here allow the pesticide to circulate. The inner heartwood is dead and does not transport fluids, so injections there won’t distribute the chemical. The outer bark surface isn’t vascular tissue, and injecting at random trunk spots leads to inconsistent distribution and potential damage. So, the best place is the outer sapwood.

When injecting a systemic pesticide, you want to deliver it into the tree’s living vascular tissue so it can move throughout the plant. The outer sapwood is the living conduction zone (xylem) that transports water and dissolved substances from roots to the canopy, so injections here allow the pesticide to circulate. The inner heartwood is dead and does not transport fluids, so injections there won’t distribute the chemical. The outer bark surface isn’t vascular tissue, and injecting at random trunk spots leads to inconsistent distribution and potential damage. So, the best place is the outer sapwood.