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Joined underwing moth

Joined underwing moth

Catocala junctura

A species of Underwings

The wingspan is 70–75 mm or more. The forewings are grayish to brownish with prominent black bands above, and whitish below. The upperside of the hindwings is orange red, with two roughly concentric blackish bands on each wing and lacking hairs at the base. The outer band separates a margin that is lighter in color than the rest of the upper hindwing. The inner band does not reach the trailing edge; its hindward tip forms a hook which points back at the wing base or almost so. The underside of the hindwings is whitish along the leading edge; the trailing three-quarters of the wing are orange red. The inner black band is present on the underwings also. As in many relatives, the foreleg tibia of this species possess no spines, while the tarsi carry three rows of spines. Adults are on the wing from June to September depending on the location. There is probably one generation per year. The caterpillars feed on willow species (Salix) and – in the west of their range – Fremont cottonwood (Populus fremontii).

General Info About Joined underwing moth
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Attributes of Joined underwing moth
Adult Food Sources
Flower nectar, honeydew, sap, ripe fruit juices, decaying fruits
Larva Food Source
Oak leaves, willow leaves, poplar leaves, birch leaves, elm leaves
Biting/stinging
Not reported
Allergy-causing
Not reported
Defensive attack
Not reported
Venomous
Not reported
Non-poisonous
Not reported
Borer
Not reported
Pollinator
Not reported
Pest-Eating Predatory
Not reported
Phytophagous
Not reported
Predatory
Not reported
Biting animal or pet
Not reported
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Species Status of Joined underwing moth
Widespread
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Predators of Joined underwing moth Larvae
Rodents, birds, spider wasps, assassin bugs, parasitic wasps
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Predators of Adult Joined underwing moth
Bats, birds, praying mantises, spiders
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Interesting Facts About Joined underwing moth
Joined underwing moth have a unique defense mechanism; they flash vivid hindwing colors when disturbed, startling potential predators.
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Scientific Classification of Joined underwing moth
Tips for Finding Joined underwing moth
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Youth Habitat of Joined underwing moth
Forests and Woodlands
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Habitat Preferences of Joined underwing moth Through Different Life Stages
The eggs of joined underwing moth are typically found on the undersides of leaves of host plants in woodland habitats. Caterpillars prefer the foliage of their specific host trees, often secreted during the day and feeding at night. Pupae are likely to be in the soil or leaf litter, close to the host plant. Adults, being nocturnal, are frequently encountered on tree trunks, near the host plant, or occasionally around lights at night. Searching for these insects, one would scour the host trees and surrounding leaf litter, checking under leaves for eggs, or visit wooded areas with a flashlight after dusk to spot the adult joined underwing moth.
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When is the Best Time to Observe Joined underwing moth
The best time to find adult joined underwing moth is during the night, as they are nocturnal and attracted to light sources. For the larval stages, daytime searching is more effective.
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What is the Best Weather to Observe Joined underwing moth
Mild, warm weather without strong winds or heavy rain is ideal for finding joined underwing moth, as extreme conditions can reduce their activity and make them more difficult to locate.
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How and Where Can You Find Joined underwing moth at Different Life Stages
Egg Eggs of joined underwing moth are typically laid on the host plant species. Identify these plants and inspect their leaves for clusters of tiny, round or oval-shaped eggs.
Larva Caterpillars of joined underwing moth can be found on or near their host plants. Search for them by carefully examining the leaves, stems, and branches for signs of feeding or the presence of frass (caterpillar droppings).
Pupal Pupae of joined underwing moth are often in concealed locations such as under loose bark or in leaf litter near the host plant. Gently sift through potential hiding spots to find them without causing harm.
Adult Adults of joined underwing moth are most active at night and can be found using light traps or by searching around outdoor lights. During the day, they may rest on tree trunks or camouflage against bark, which can be spotted by close inspection.
Are Joined underwing moth harmful?
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