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August thorn

August thorn

Ennomos quercinaria

A species of Ennomos

The wingspan is 4 - 5 cm. The length of the forewings is 1.8 - 2 cm. The ground colour is orange yellow. The forewings are lightly or heavily speckled and have a dark marginal edge. Both forewings and hindwings are scalloped at the edges and have two cross lines. The discal spot is not always evident. It is similar to Ennomos alniaria, but distinguished by the postmedian line (outer line) curving inwards towards the costa.

General Info About August thorn
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Attributes of August thorn
Colors
Brown
Habitat
oak; beech; woodland; garden; vegetation; park; suburban area
Adult Food Sources
Flower nectar, sap from trees, ripe fruit juices, honeydew, water with dissolved sugars and salts
Larva Food Source
Oak leaves, hazel leaves, elm leaves, birch leaves, willow leaves
Biting/stinging
Not reported
Allergy-causing
Not reported
Defensive attack
Not reported
Venomous
Not reported
Non-poisonous
The August thorn 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 August thorn 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
Siphoning mouthparts
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Species Status of August thorn
It can be found in Europe.
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Distribution Area of August thorn
Europe, Belgium, Netherlands, Iberian Peninsula, Greece, Hungary, Romania, European Turkey, Ukraine, Iberian Peninsula, Italy, Sicily
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Life Cycle of August thorn
Egg The embryonic stage of august thorn starts with the egg, which is usually laid on foliage. The egg is minute, spherical or ovate, and initially might mimic plant structures in color and shape.
Larva Upon hatching, the larva of august thorn emerges as a caterpillar, differing greatly from the adult form. Its primary function is to eat and grow, moulting several times and typically exhibiting a cryptic coloration for camouflage.
Pupal The caterpillar of august thorn will eventually enter the pupal stage, creating a chrysalis for protection. Inside, significant reorganization occurs, transforming the creature. This stage is motionless, where the organism is vulnerable and often camouflaged.
Adult Emerging from the pupa, the adult august thorn’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 August thorn
4 - 5 cm
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Predators of August thorn Larvae
Birds, rodents, reptiles, amphibians, invertebrate predators such as beetles and ants
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Predators of Adult August thorn
Bats, birds, rodents, spiders, other insect predators
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Interesting Facts About August thorn
In a remarkable display of camouflage, august thorn caterpillars can mimic twigs to evade predators, altering their bodies to astonishingly resemble the color, shape, and even texture of real branches.
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Scientific Classification of August thorn
Tips for Finding August thorn
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Youth Habitat of August thorn
Forests and Woodlands
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Adult Habitat of August thorn
Forests and Woodlands
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How Can You Attract August thorn
Since august thorn caterpillars feed on a variety of deciduous trees, providing leaves from trees such as oaks or willows may serve as an effective lure.
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Habitat Preferences of August thorn Through Different Life Stages
The egg stage of august thorn is usually found on the underside of host tree leaves, particularly oak. Caterpillars, adorned with markings that camouflage them amongst foliage, tend to feed on the leaves of the same trees, making arboreal environments ideal for observation. Pupae may be encountered in leaf litter or in the soil beneath the host tree, utilizing the detritus as protection during metamorphosis. Adult august thorn, predominantly active at night, are frequently observed resting on tree trunks or amidst vegetation, where their wing patterns provide effective camouflage. Searching for these insects necessitates a focus on forested areas, inspecting the ground as well as the foliage at various heights.
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When is the Best Time to Observe August thorn
The best time to find adult august thorn is during their flight season which is typically from July to October. For larvae, shortly after hatching which occurs a few weeks after the adults lay eggs.
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What is the Best Weather to Observe August thorn
Look for august thorn during dry and mild nights for adults, as they are nocturnal and attracted to light. For caterpillars, a warm and humid day might be ideal when they are actively feeding.
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How and Where Can You Find August thorn at Different Life Stages
Egg Eggs of august thorn might be found on the underside of leaves of host plants. Careful inspection of these leaves, especially of trees like oaks, can help in spotting the eggs.
Larva August thorn caterpillars are twig mimics and can be found on or near their host plants. Look for them by inspecting branches and twigs of host trees where they might rest to evade predators.
Pupal Most august thorn pupate in the leaf litter on the ground, so searching through layers of leaves beneath host plants can lead to the discovery of their pupae.
Adult Adult august thorn can be found resting on tree trunks during the day. At night, they can be attracted to light sources such as light traps or white sheets with a bright light behind them.
Are August thorn harmful?
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Harmful Effects of August thorn
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Forestry Pest

Larvae of august thorn can cause mild to severe defoliation in broad-leaved forests, particularly during outbreak years. While a sparse population may only slightly slow tree growth, severe infestations can lead to significant leaf loss, weakening trees and making them more susceptible to secondary pests and diseases. The loss of foliage also impacts forest ecosystems and potentially timber value, affecting human economic interests.

More Effects of August thorn

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