Microinfusion is defined as

Microinfusion is defined as

• A. An injection method that uses pressure to deliver a small quantity of a concentrated pesticide directly into the vascular system of a tree.
• B. A method of applying a pesticide solution directly into the soil.
• C. A spray method for foliar surfaces.
• D. A leaf-drench liquid application.

Answer: (A)

Microinfusion is the targeted delivery of a pesticide by injecting a small, concentrated dose directly into the tree’s vascular system under pressure, so the chemical moves systemically with the sap to reach tissues throughout the tree. This method bypasses surface barriers and relies on the plant’s own transport system to distribute the pesticide, making it effective against pests that dwell inside wood or tissues. It differs from soil applications, which depend on root uptake; from foliar sprays, which only treat leaf surfaces; and from leaf-drench or other surface applications, which don’t rely on systemic movement. The defining feature is injecting under pressure into the tree’s vascular system for internal distribution.

Microinfusion is the targeted delivery of a pesticide by injecting a small, concentrated dose directly into the tree’s vascular system under pressure, so the chemical moves systemically with the sap to reach tissues throughout the tree. This method bypasses surface barriers and relies on the plant’s own transport system to distribute the pesticide, making it effective against pests that dwell inside wood or tissues. It differs from soil applications, which depend on root uptake; from foliar sprays, which only treat leaf surfaces; and from leaf-drench or other surface applications, which don’t rely on systemic movement. The defining feature is injecting under pressure into the tree’s vascular system for internal distribution.