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False Bruce Spanworm

Macaria loricaria

A species of Macaria

Macaria loricaria, the false Bruce spanworm or Eversmann's peacock, is a moth of the family Geometridae. It is found from Fennoscandia and the Baltic states to Sakhalin. It is also found in North America, where it is found from Alaska to Newfoundland and New York, south to Colorado. The wingspan is 25–29 mm for males. Females are wingless. Adults are on wing from mid July to August in Europe and from late June to late July in North America. The larvae feed on Salix and Betula species as well as Populus tremuloides in North America. Larvae can be found from May to July It overwinters as an egg.

General Info About False Bruce Spanworm
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Attributes of False Bruce Spanworm
Colors
Brown
Gray
White
Habitat
Mixedwood; deciduous forest
Adult Food Sources
Nectar from flowering plants, honeydew, tree sap, water with dissolved minerals, fruit juices
Larva Food Source
Leaves of coniferous trees, pine needles, spruce needles, fir needles, larch needles
Biting/stinging
Not reported
Allergy-causing
Not reported
Defensive attack
Not reported
Venomous
Not reported
Phytophagous
Not reported
Predatory
Not reported
Biting animal or pet
Not reported
Mouthparts Type
Siphoning mouthparts
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Species Status of False Bruce Spanworm
Stable population, rare
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Distribution Area of False Bruce Spanworm
Fennoscandia, Baltic states, Sakhalin, North America, Alaska, Newfoundland, New York, Colorado
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Predators of Adult False Bruce Spanworm
Birds, bats, small mammals like shrews and rodents, predatory insects such as mantises and dragonflies
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Interesting Facts About False Bruce Spanworm
False Bruce Spanworm larvae can alter their body color to closely match the twigs they reside on, making them nearly invisible to predators.
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Scientific Classification of False Bruce Spanworm
Tips for Finding False Bruce Spanworm
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Youth Habitat of False Bruce Spanworm
Forests and Woodlands, Agricultural and Cultivated Areas
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Habitat Preferences of False Bruce Spanworm Through Different Life Stages
Eggs of false Bruce Spanworm are typically laid on host plants. Caterpillars are found on or near their food sources, usually the leaves of trees or shrubs. Pupation often occurs in a concealed location on or near the ground, potentially under leaf litter or in crevices. Adult false Bruce Spanworm are nocturnal and are attracted to light, so they may be spotted on or near light sources at night. If one intends to search for the various stages, examine the host plants for eggs and caterpillars, sift through leaf litter for pupae, and employ light traps or visit lit areas after dark to observe adults.
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When is the Best Time to Observe False Bruce Spanworm
The ideal time to find false Bruce Spanworm greatly depends on the life stage. For caterpillars, late spring to early summer is appropriate, whereas adults are more often seen from late summer to autumn, primarily at night times.
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What is the Best Weather to Observe False Bruce Spanworm
Adult false Bruce Spanworm are more active on warm, dry, and calm nights, making these conditions optimal for observation. Meanwhile, the larvae prefer similar temperate conditions during daylight hours.
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How and Where Can You Find False Bruce Spanworm at Different Life Stages
Egg Eggs of false Bruce Spanworm are typically laid on the underside of host plant leaves and can be found by carefully inspecting these areas for small, round, or ovate objects of a color that may blend with the foliage.
Larva Caterpillars of false Bruce Spanworm can be found on host plants where they feed. Look for notched leaves or frass (caterpillar droppings) on or below leaves of host plants as indicators of their presence.
Pupal Pupae of false Bruce Spanworm may be found attached to twigs, leaves, or bark of host plants or hidden in leaf litter. Searching in these areas requires a gentle approach to avoid disturbing the pupae.
Adult Adult false Bruce Spanworm moths are nocturnal and attracted to light sources. A simple approach to locate them is by setting up a white sheet with a light shining on it at night, where they may land and be observed.
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Harmful Effects of False Bruce Spanworm
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Hurt Plant

Larvae of false Bruce Spanworm feed on leaves, potentially leading to defoliation. The severity of the damage may vary, but host plants can often experience growth reduction and in severe cases, death.

More Effects of False Bruce Spanworm

Common Questions People Also Ask
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