Final answer:
The subject of this question is Biology. Wood used for packaging or dunnage needs to be treated with chemicals to prevent insect infestations as a biological control measure.
Step-by-step explanation:
The subject of this question is Biology. In the context of the question, wood used for packaging or dunnage needs to be treated with chemicals to prevent insect infestations. This is a biological control measure to protect against insect populations and resistance.