Why is the cambium region of the tree attractive to some insects?

The cambium region of a tree is attractive to some insects because it is a rich source of nutrients and moisture, providing ideal conditions for feeding and reproduction. This layer of actively dividing cells is critical for the tree's growth and is often softer and more accessible than the harder outer bark. Insects such as bark beetles and certain aphids are drawn to the cambium for its high sugar content and the presence of other essential compounds. Additionally, the cambium's vulnerability during stress or injury makes it a prime target for infestations.