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Elephant weevil

Elephant weevil

Orthorhinus cylindrirostris

A species of Orthorhinus

The elephant weevil (Orthorhinus cylindrirostris) gets its name from its long, trunk-like structure on its face. Its body has an unusual bumpy, spotted pattern to allow it to blend in with lichen. It's a wood boring insect that primarily feeds on eucalyptus species and fruit trees, and it causes damage to vineyards.

General Info About Elephant weevil
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Attributes of Elephant weevil
Colors
Brown
Black
White
Habitat
grape vine
Adult Food Sources
Leaves, flower buds, fruits, plant stems, sap
Larva Food Source
Plant roots, woody plant materials, bark
Biting/stinging
Not reported
Allergy-causing
Not reported
Defensive attack
Not reported
Venomous
Not reported
Non-poisonous
The Elephant weevil is non-toxic and generally doesn't pose a risk to human health. No need for excessive worry.
Borer
Not reported
Biting animal or pet
Not reported
Mouthparts Type
Chewing mouthparts
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Appearance of Elephant weevil
Color and size are extremely variable with the adult size ranging between 1 cm and 2 cm. Typically there is a tubercle on both sides of the pronotum, both elytron have two tubercles on the 2nd interstices. The 5th interstice has similar tubercle on posterior declivity. A male's antennae are much closer to the apex of the rostrum, they also have longer forelegs than females. The three basal tarsal segments are more expanded in the male than the female. Females are less cylindrical, more coarse and shorter than the males.
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How to Identify Elephant weevil?

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Life Cycle of Elephant weevil
Egg The eggs of elephant weevil are laid in clusters, and they are often oval or round. The size is very small and color can vary, generally blending with the environment for protection.
Larva Larvae of elephant weevil are worm-like with a hard head capsule and chewing mouthparts for feeding. They usually lack limbs, grow significantly in size, and molt several times.
Pupal In the pupal stage, elephant weevil undergoes transformation within a protective cocoon or cell. The insect is immobile, and its body reorganizes into the adult form with major changes in structure.
Adult Emerging from the pupa, the adult elephant weevil’s development is marked by the presence of wing cases and functional reproductive organs. The body is fully formed, capable of flight, and primarily focused on reproduction.
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Adult Size of Elephant weevil
1 - 2 cm
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Predators of Elephant weevil Larvae
Frogs, toads, birds, mantises
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Predators of Adult Elephant weevil
Birds, spiders, rodents, lizards
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Interesting Facts About Elephant weevil
Elephant weevil can manipulate its snout into a surprisingly varied range of shapes, aiding in its intricate feeding process.
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Scientific Classification of Elephant weevil
Tips for Finding Elephant weevil
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How Can You Attract Elephant weevil
For adult elephant weevil, foods or scents that attract them could be sweet fruits, fermenting substances, or host plant materials. For larval stages, suitable bait might include the specific plant material they feed on.
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Habitat Preferences of Elephant weevil Through Different Life Stages
The larvae of elephant weevil typically develop within hardwood trees, where they are found burrowing in tunnels they create to feed on the wood. To search for them, one would inspect trees showing signs of damage or boreholes, often around the trunk or branches. Adult elephant weevil can be found on the bark of the same trees or on nearby vegetation. To seek adults, searching on and around host trees, especially during mating season, increases the chances of encounter, as adults will often be present for both mating and oviposition.
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When is the Best Time to Observe Elephant weevil
The most appropriate time to find adult elephant weevil would be during their active periods which could be during the day or night depending on the species. For the larvae, it might be best when they are actively feeding which is often seasonally dependent.
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What is the Best Weather to Observe Elephant weevil
Adult elephant weevil are typically more active in warmer and drier weather, while rain might trigger the emergence of the larva from their host plant or substrate.
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How and Where Can You Find Elephant weevil at Different Life Stages
Adult To locate adult elephant weevil, check for them on or near their host plants, especially where flowers or ripe fruits are present. They may also be attracted to light traps at night.
Larva Finding larval elephant weevil requires searching their food sources, usually inside damaged plant tissue such as stems or roots, or under plant debris near the host plant.
Pupal Pupae of elephant weevil might be located in the soil or plant debris near the host plant. Gentle excavation nearby host plants could reveal their presence.
Are Elephant weevil harmful?
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Harmful Effects of Elephant weevil
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Agricultural Pests

The impact of elephant weevil ranges from mild to severe. Larvae bore into roots and stems, disrupting nutrient uptake. A small number can stunt growth, while severe infestations can kill plants. This extensive damage could impact crop yields, harm food security, and have economic consequences for farmers.

More Effects of Elephant weevil

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