Is it true that microinjectors can be both passive and active application devices?

Microinjectors indeed can be classified as both passive and active application devices, which makes the answer 'Yes' accurate.

In passive microinjectors, the delivery of the active ingredient relies on the natural processes such as diffusion or capillarity. These devices do not require any external power and generally utilize gravity or fluid pressure. This type of device is often simpler and can be effective in certain situations, such as providing a slow release of a treatment over time.

On the other hand, active microinjectors utilize some form of energy, such as mechanical or electrical power, to introduce the pesticide. This may allow for more precise control over the application rate and effectiveness of the pest control measures, making them suitable for challenging environments or situations where specific targeting is necessary.

Understanding these two categories aids in selecting the appropriate method for pest management based on the target pest and the specific conditions of the area being treated.