Why do some trees make resin after being injured?
Quick Answer
Resin is a tree’s chemical defense. It seals wounds and can trap or repel insects and pathogens.
The Full Story
Many conifers, including pines and firs, respond to injury by producing sticky resin. This resin helps block the wound, slowing the spread of fungi and bacteria and making it harder for insects to burrow deeper into the wood. In some species, resin also contains compounds that are toxic or irritating to attackers. The defense is part of a tree’s immune-like system and can be triggered by drilling insects, storms, fire, or pruning. Amber is fossilized tree resin, showing how long this defense strategy has existed in plant evolution.
Key Facts
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