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Acorn weevil

Acorn weevil

Curculio glandium

A species of Acorn weevils

The acorn weevil (Curculio glandium) can be distinguished by its large snout, which is often called a "rostrum". The females usually have a notably longer rostrum though. These bugs live in oak trees, and they use their long snouts to bore into acorns, which is where females lay their eggs. Then, the larvae feed on the inside of the acorn.

General Info About Acorn weevil
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Attributes of Acorn weevil
Colors
Brown
Habitat
oak
Adult Food Sources
Oak leaves, buds, flowers, acorns, fruits of oak trees
Larva Food Source
Oak acorn tissue, nut kernels, oak seed endosperm
Biting/stinging
Not reported
Allergy-causing
Not reported
Defensive attack
Not reported
Venomous
Not reported
Non-poisonous
The Acorn weevil is non-toxic and generally doesn't pose a risk to human health. No need for excessive worry.
Borer
Not reported
Pollinator
Not reported
Pest-Eating Predatory
Not reported
Phytophagous
The Acorn weevil feeds on plants, usually without causing significant harm. However, it's important to take the situation seriously if their numbers begin to increase significantly.
Predatory
Not reported
Biting animal or pet
Not reported
Mouthparts Type
Chewing mouthparts
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Species Status of Acorn weevil
It is native to eastern North America.
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Distribution Area of Acorn weevil
Britain
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Appearance of Acorn weevil
The larvae are short, and cylindrical in shape, and move by means of ridges on the underside of the body. Adults can reach a length of 4 - 8 mm.
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How to Identify Acorn weevil?

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Life Cycle of Acorn weevil
Egg The egg stage marks the beginning of the acorn weevil's life cycle. During this period, the eggs are often laid in clusters and are typically small and oval. The color may vary but usually blends with the environment to evade predators.
Larva As larvae, acorn weevils are worm-like with a soft body. They lack true legs, have distinct mouthparts for feeding, and undergo several molts, growing significantly in size with each shed. The larvae are often a different color from the adults.
Pupal During the pupal stage, acorn weevil undergoes transformation within a protective case. In this immobile phase, the body reorganizes into the adult form—developing wings, elytra, and fully formed legs. The pupa may change color before adulthood.
Adult Emerging from the pupa, the adult acorn weevil’s development is marked by the presence of wings and functional reproductive organs. The body is fully formed and hardened, and the adult is mobile, focusing on reproduction and dispersal.
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Adult Size of Acorn weevil
4 - 8 mm
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Predators of Acorn weevil Larvae
Birds, rodents, insects such as ants and predatory wasps
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Predators of Adult Acorn weevil
Birds, rodents, insects such as ants, predatory beetles, and earwigs, arachnids like spiders
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Interesting Facts About Acorn weevil
Despite their tiny size, acorn weevil can carry seeds up to 100 times their weight, exhibiting exceptional strength relative to their body mass.
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Scientific Classification of Acorn weevil
Tips for Finding Acorn weevil
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Youth Habitat of Acorn weevil
Forests and Woodlands
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Adult Habitat of Acorn weevil
Forests and Woodlands
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Habitat Preferences of Acorn weevil Through Different Life Stages
The larvae of acorn weevil typically develop inside oak acorns, where they find both protection and nourishment. To search for them, inspect fallen acorns under oak trees. Adult acorn weevil can be found mainly on the foliage and branches of oak trees during the warmer months when they emerge to feed and mate. Searching for adults would involve examining the leaves and bark crevices of oak trees, as they prefer these spots to find food and engage in courtship rituals. The pupae are often located inside the acorns or in the soil nearby, signifying their transitional stage, so carefully splitting open the acorns or gently sifting through the soil beneath the oak trees may reveal them.
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How and Where Can You Find Acorn weevil at Different Life Stages
Larva Acorn weevil larvae develop inside their food source, so to locate them, search for holes in nuts or acorns, which indicate the presence of larvae. Carefully open the nuts or acorns to find the larvae inside.
Pupal Acorn weevil pupae can be found within the soil or leaf litter. To locate them, gently sift through the top layer of soil or leaf litter in an area where infested nuts have fallen.
Adult Acorn weevil adults are typically found on or near host trees. To find them, inspect the foliage, bark, and branches of host plants during the early morning or late evening when they are most active.
Are Acorn weevil harmful?
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Harmful Effects of Acorn weevil
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Hurt Plant

Acorn weevil adults and larvae widely infest plants, displaying no specific preference, and cause mild to severe damage. Adults feed on, and lay eggs in, fruits and seeds. Larvae chew through plant tissues, which can lead to reduced crop yields and compromised plant health.

More Effects of Acorn weevil

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