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Popular Insects
The tanner

The tanner

Prionus coriarius

A species of Prionus, Also known as The sawyer

The tanner (Prionus coriarius) who sounds like they have a name that comes straight out of a horror movie. To avoid this association, they are typically called tanner beetles. They are a deep brown, somewhat resembling tanned leather. They are also one of the largest beetles in Europe.

General Info About The tanner
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Attributes of The tanner
Colors
Brown
Black
Habitat
rotten wood
Adult Food Sources
Sap from deciduous trees, bark of trees, leaves of shrubs, floral nectar, leaves of broad-leaved trees
Larva Food Source
Roots of deciduous trees, roots of shrubs, roots of apple trees, roots of hop plants, roots of oak trees
Biting/stinging
Not reported
Allergy-causing
Not reported
Defensive attack
Not reported
Venomous
Not reported
Non-poisonous
The The tanner is non-toxic and generally doesn't pose a risk to human health. No need for excessive worry.
Borer
The The tanner can bore into the wood and may damage its structure, or even harm the health of trees. Stay alert if you frequently observe it in your house.
Pollinator
Not reported
Pest-Eating Predatory
Not reported
Phytophagous
The The tanner 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 The tanner
It is common in most of Europe and it is present in North Africa and in the Near East.
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Distribution Area of The tanner
Europe, North Africa, Turkey, Caucasus, Transcaucasia, Iran
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Appearance of The tanner
Prionus coriarius can reach a length of 1.8 - 4.5 cm. The female is larger than the male. Body is shiny, dark brown to black. The neck shield bears on each side three clearly distinct teeth. The serrated antennae of the male are composed of 12 segments. The ventral surface of the female is hairless, while in the male is pubescent. The larvae can reach a length of about 6 cm.
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How to Identify The tanner?

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Life Cycle of The tanner
Egg The egg of the tanner serves as the starting point for life, often laid in protected environments. The small, oval-shaped egg matures until a larva is ready to emerge.
Larva As larvae, the tanner undergoes significant growth. These grubs have a voracious appetite and are typically whitish, segmented, and legless. They increase in size through a series of molts.
Pupal Transformation occurs during the pupal stage. The pupa of the tanner is immobile and encapsulated within a cocoon-like structure, as it reorganizes its anatomy into adult form.
Adult Emerging from the pupa, the adult the tanner’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.
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Adult Size of The tanner
1.8 - 4.5 cm
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Predators of The tanner Larvae
Birds, small mammals, reptiles, other insect predators
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Predators of Adult The tanner
Birds, bats, reptiles, arachnids, large insects
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Interesting Facts About The tanner
Though formidable in appearance, the larvae of the tanner play a critical role in decomposing dead wood, recycling nutrients back into the ecosystem.
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Scientific Classification of The tanner
Tips for Finding The tanner
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Youth Habitat of The tanner
Forests and Woodlands, Rotting and Decaying Matter
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Adult Habitat of The tanner
Forests and Woodlands
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How Can You Attract The tanner
Adult the tanner are attracted to decaying wood and the scent of fermenting fruit which can be used as bait in traps.
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Habitat Preferences of The tanner Through Different Life Stages
The eggs of the tanner are typically deposited in the soil near the roots of hardwood trees, where the larvae, once hatched, burrow to feed on the decaying wood and roots. As they progress through larval stages, they can be found within the subterranean woody structures they consume. Searching for these larvae involves carefully excavating around the roots of host trees. Pupation usually occurs in the soil close to the food source. To find pupae, one might need to dig deeper near the tree bases. Adult the tanner are often located on or near the trunks of host trees, particularly at dusk when they are most active. Seeking out adults would entail inspecting tree trunks and branches, especially those of oak or willow, during crepuscular hours when they are likely to emerge.
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When is the Best Time to Observe The tanner
The best time to find the tanner is during the evening or at night as many are nocturnal and more active during these hours.
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What is the Best Weather to Observe The tanner
Warm and humid weather conditions are often most suitable to find the tanner as they prefer moist environments for both activity and breeding.
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How and Where Can You Find The tanner at Different Life Stages
Larva Larvae of the tanner are wood-borers, typically residing within dead or decaying wood. To find them, search for trees with signs of damage and boreholes, and carefully examine or dissect the wood to locate the larvae inside.
Pupal Pupae of the tanner can be found in similar locations as the larvae, within the wood. Look for them in chambers just beneath the bark or deeper within the wood as they transition into adults.
Adult Adult the tanner are often found on or near host trees. To find them, search around the base of susceptible trees at night using a flashlight, or set up light traps that attract them using UV light or pheromone lures.
Are The tanner harmful?
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Harmful Effects of The tanner
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Forestry Pest

The larvae of the tanner pose a significant threat to agriculture, indiscriminately attacking root systems of a variety of crops. Infestation results in disrupted water and nutrient uptake, leading to stunted growth and reduced yields. A severe infestation can kill young plants, while moderate levels weaken plants, making them more susceptible to other stressors. This can have dire economic impacts for farmers and can affect the supply of food products for humans.

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