Pelidnota punctata
(Linnaeus, 1758)
Grapevine Beetle, Spotted June Beetle, Spotted Pelidnota
Pelidnota punctata is a scarab beetle in the Rutelinae, commonly known as the grapevine or spotted . are approximately 2.5–3 cm long with variable coloration ranging from off-yellow to auburn red, marked by four black spots on each side of the . The exhibits regional variation: northern typically have darker legs and more pronounced spotting, while southern populations may lack spots entirely and have lighter legs. It is distributed across eastern North America from Ontario to Florida and west to Texas and South Dakota.
Pronunciation
How to pronounce Pelidnota punctata: //pɛˈlɪdnəʊtə pʌŋkˈtɑːtə//
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Identification
Distinguished from similar scarab beetles by the combination of size (2.5–3 cm), oval body shape, and the distinctive four-spot pattern on each . Regional color variation can complicate identification: specimens from northern range with dark legs and prominent spotting are most recognizable, while southern specimens with reduced markings may require careful comparison. The curving, fast pattern is also characteristic. Similar to other Pelidnota but spot pattern and geographic range help differentiate.
Images
Appearance
measure 2.5–3 cm in length. The body is oval and robust. Coloration varies regionally: off-yellow to auburn red background with four black spots running down each side of the . Fine black lines divide the edges of the elytra. Northern form has darker legs and more numerous, darker spots; southern form has lighter legs and spots may be reduced or absent.
Habitat
Forests, thickets, and woodlands. Also found in vineyards and gardens. are attracted to lights at night. Larval development occurs in soil and rotting wood.
Distribution
Eastern North America: Ontario, Quebec, and Manitoba in Canada; United States from Maine south to Florida, and west to Texas, South Dakota, and Kansas. Most common in north-central United States and eastern Canada.
Seasonality
active primarily during summer months. Adults emerge in July. Complete spans two years.
Diet
feed on leaves and fruit of grapevines (Vitis spp.), both wild and cultivated. Larvae feed on rotted wood in soil and decaying organic matter.
Host Associations
- Vitis - food sourceleaves and fruit of wild and cultivated grapevines
Life Cycle
laid in rotten wood, tree stumps, or soil near plants. Larvae hatch and burrow into soil, feeding on rotted wood; may reach 5 cm in length. occurs in shallow underground chambers. emerge in July. Complete development from egg to adult requires two years.
Behavior
Strong, fast fliers with characteristic curving path. Nocturnally attracted to artificial lights. are active during summer. Relatively minor pest of vineyards despite feeding on grape foliage and fruit.
Ecological Role
Larvae contribute to decomposition of rotting wood and organic matter in forest soils. serve as herbivores, consuming grape foliage and fruit with minimal economic impact. Part of as prey for insectivorous birds and other .
Human Relevance
Minor agricultural pest of grapevines; damage to vineyards is usually limited and does not require control measures. Attracted to outdoor lighting, which may bring them into proximity with human residences. Subject of taxonomic confusion in early 20th century when split into 11 , later synonymized.
Similar Taxa
- Other Pelidnota speciesSimilar body form and size; distinguished by specific spot pattern and coloration details
- Other Rutelinae scarabsShare general scarab beetle ; P. punctata identified by four-spot elytral pattern and regional color variants
More Details
Taxonomic history
In 1915, Thomas Casey split this into 11 different based on variable coloration and spotting patterns. These names were subsequently relegated to synonymy by later , recognizing the extensive natural variation within a single species.