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Green Immigrant Leaf Weevil

Green Immigrant Leaf Weevil

Polydrusus formosus

A species of Polydrusus

Look for the green Immigrant Leaf Weevil in its preferred habitat, the yellow birch tree. It is an introduced species to North America, typically found in temperate climates. It is most active in the spring and summer when it congregates around nurseries. The insect is also a nuisance to some trees like oak, poplar, and willow. However, it is not considered a pest insect.

General Info About Green Immigrant Leaf Weevil
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Attributes of Green Immigrant Leaf Weevil
Colors
Brown
Black
Green
Habitat
broadleaved tree; bush; hedgerow; park; wasteland; birch; deciduous tree
Adult Food Sources
Leaves of shrubs and trees, soft young bark, buds, flowers, fruit
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
Mouthparts Type
Chewing mouthparts
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Distribution Area of Green Immigrant Leaf Weevil
This beetle is present in most of Europe and in the Nearctic realm.
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Predators of Adult Green Immigrant Leaf Weevil
Birds, small mammals, reptiles, predatory insects
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Interesting Facts About Green Immigrant Leaf Weevil
Green Immigrant Leaf Weevil can alter their gut bacteria to digest various leaves, a versatility not found in every insect.
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Scientific Classification of Green Immigrant Leaf Weevil
Tips for Finding Green Immigrant Leaf Weevil
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Youth Habitat of Green Immigrant Leaf Weevil
Forests and Woodlands, Grasslands and Prairies, Urban and Suburban Areas
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Habitat Preferences of Green Immigrant Leaf Weevil Through Different Life Stages
The larvae of green Immigrant Leaf Weevil typically reside in the soil where they feed on the roots of plants, requiring a search through the topsoil and examining root systems. Adults are commonly found on the foliage of a wide range of deciduous trees, such as elm, birch, and willow. Searching for them involves scanning leaves, flowers, and new shoots during the spring and summer when they are most active. Pupation occurs in the soil, therefore inspecting the soil in close proximity to host plants, especially during late summer, can yield sightings of the pupal stage.
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When is the Best Time to Observe Green Immigrant Leaf Weevil
The suitable time to find green Immigrant Leaf Weevil is typically during the warmer months when they are most active. Early mornings or late afternoons might be the best time to spot these creatures when they are less wary and are foraging for food.
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What is the Best Weather to Observe Green Immigrant Leaf Weevil
Mild, humid weather with little wind is ideal for finding green Immigrant Leaf Weevil, as excessively hot, dry, or windy conditions might cause the creature to seek shelter and become less active.
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How and Where Can You Find Green Immigrant Leaf Weevil at Different Life Stages
Larva Green Immigrant Leaf Weevil larvae are typically found in or around their food source, which may include plant roots or inside plant stems. To find larvae, inspect the base of plants or carefully dig around the roots while being mindful not to harm the plant or the larvae.
Pupal During the pupal stage, green Immigrant Leaf Weevil are often immobile and concealed within a cocoon or pupal chamber in soil or leaf litter. Locating them involves gently searching through such materials around the host plants or areas where larvae were found.
Adult Green Immigrant Leaf Weevil adults can be spotted on or around host plants as they feed. Observing flowers, leaves, or bark of trees during suitable weather conditions and at appropriate times of day can yield sightings. Visual surveys or sweep netting along vegetation can be effective methods for locating adult green Immigrant Leaf Weevil.
Are Green Immigrant Leaf Weevil harmful?
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Harmful Effects of Green Immigrant Leaf Weevil
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Garden and Landscape Pest

Adults and larvae of green Immigrant Leaf Weevil are known to feed on the leaves and stems of ornamental plants such as roses and fruit trees, causing defoliation and weakening of the plant structure. The severity ranges from mild aesthetic damage to more severe health impacts on the plants. In large numbers, they can lead to significant plant stress, potentially affecting human enjoyment and the value of the landscape.

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Agricultural Pests

When existing in small numbers, green Immigrant Leaf Weevil larvae may cause minor defoliation that's often cosmetic. However, severe infestations can lead to significant leaf loss, weakening host plants and reducing photosynthesis. This can diminish crop yields, impact food supply, and affect farm profits. Humans might face economic challenges and potential food shortages as a consequence.

More Effects of Green Immigrant Leaf Weevil

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