The Hidden Life Inside an Ordinary Acorn: Meet the Acorn Weevil Larva!
What may look like a tiny creature from a horror movie is actually an acorn weevil larva, a small insect that develops inside oak seeds. Female acorn weevils from the genus Curculio lay their eggs inside developing acorns. Once the eggs hatch, the larvae feed on the nutritious material inside, remaining hidden for weeks or even months as they grow.
When fully developed, the larva chews a small opening through the hard acorn shell and makes its way out, eventually reaching the surrounding soil. There, it continues its development underground, transforming into a pupa before emerging as an adult beetle. A small, round hole in an acorn is often a sign that a larva has already left. Adult acorn weevils have brownish or grayish bodies and a distinctive elongated snout that females use when laying their eggs.
Despite their unusual appearance, these larvae are generally harmless to people and pets. They are not venomous and do not pose a threat simply by being around oak trees. They are also part of the forest ecosystem, providing food for other organisms while oak trees support countless insects, birds, and mammals. If you collect acorns for decorations or crafts, check for small holes, cracks, and soft spots before bringing them indoors. If you find larvae outdoors, there is usually no need for pesticides; simply leaving them in their natural environment is perfectly fine.