Which method is not primarily used to deliver pesticide into a tree's trunk or vascular system?

Which method is not primarily used to deliver pesticide into a tree's trunk or vascular system?

• A. Granular application
• B. Macroinfusion
• C. Microinfusion
• D. Soil injection

Answer: (A)

Understanding which pesticide delivery methods actually place product inside a tree’s vascular system versus staying in the soil or bark is key. Macroinfusion and microinfusion are techniques that introduce the chemical directly into the tree's vascular pathways through the trunk, delivering the product into the sapwood so it can circulate with the xylem/phloem. Soil injection places the pesticide into the root zone so the tree can take it up into the vascular system from the roots. Granular application, by contrast, is a soil-based treatment that stays largely in the soil or on the surface and relies on gradual movement into the root zone or soil-residue action; it is not a method designed to deliver pesticides directly into the trunk or vascular system. Therefore, granular application is not primarily used for trunk or vascular delivery.

Understanding which pesticide delivery methods actually place product inside a tree’s vascular system versus staying in the soil or bark is key. Macroinfusion and microinfusion are techniques that introduce the chemical directly into the tree's vascular pathways through the trunk, delivering the product into the sapwood so it can circulate with the xylem/phloem. Soil injection places the pesticide into the root zone so the tree can take it up into the vascular system from the roots. Granular application, by contrast, is a soil-based treatment that stays largely in the soil or on the surface and relies on gradual movement into the root zone or soil-residue action; it is not a method designed to deliver pesticides directly into the trunk or vascular system. Therefore, granular application is not primarily used for trunk or vascular delivery.