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Chinese Rose Beetle (Adoretus sinicus)

The Chinese rose beetle is a member of the family of scarab beetles. It is a major pest to a wide variety of plants, attacking their leaves and defoliating them.

Chinese Rose Beetle

Scientific Classification

  • Family: Scarabaeidae
  • Genus: Adoretus
  • Scientific name: Adoretus sinicus

Physical Description and Identification

Adult

Size: 10 – 12 mm

Color: It is reddish-brown.

Other Characteristic Features: These beetles are oblong and oval-shaped, covered in dense, creamy, scale-like hairs, which give them a grayish appearance.

Adoretus sinicus

Larva

They are white and ‘C’- shaped. The larva passes through three instars, 19.6-22.8 days for the first instar, 14.5-16.8 days for the second, and 34.3 – 44.4 days for the third.

Chinese Rose Beetle Larva

Pupa

The pupae are 6-12 mm long and covered with short, dense hair. This stage lasts for 11 – 17 days.

Egg

Eggs are white and oval, measuring 1.5 x  1.0 mm. They hatch after 7-16 days.

Quick Facts

Lifespan1 week
DistributionNative: Japan and Taiwan Invasive: Southeast Asia and the Pacific islands
HabitatAgricultural land, plantations, managed forests, orchards, natural forests, urban areas, and coastal regions
PredatorsWasps and other beetles
Host plants Asparagus, beans, broccoli, cabbage, cacao, corn, cotton, cucumber, eggplant, ginger, grape, green bean, okra, rose, soybeans, strawberry, and sweet potato.
Diet of adultsPlant tissue of host plants
Chinese Rose Beetle Damage

Identifying the Damage Caused by Them

The leaves these beetles feed on are completely skeletonized, with nothing but the veins remaining.

Did You Know

  • Adult beetles only use one side of their mouth to feed at a time.
Chinese Rose Beetle Image
Chinese Rose Beetle Picture

Image Source: lh6.ggpht.com, lh3.googleusercontent.com, researchgate.net, ctahr.hawaii.edu, inaturalist-open-data.s3.amazonaws.com,

The Chinese rose beetle is a member of the family of scarab beetles. It is a major pest to a wide variety of plants, attacking their leaves and defoliating them.

Chinese Rose Beetle

Physical Description and Identification

Adult

Size: 10 – 12 mm

Color: It is reddish-brown.

Other Characteristic Features: These beetles are oblong and oval-shaped, covered in dense, creamy, scale-like hairs, which give them a grayish appearance.

Adoretus sinicus

Larva

They are white and ‘C’- shaped. The larva passes through three instars, 19.6-22.8 days for the first instar, 14.5-16.8 days for the second, and 34.3 – 44.4 days for the third.

Chinese Rose Beetle Larva

Pupa

The pupae are 6-12 mm long and covered with short, dense hair. This stage lasts for 11 – 17 days.

Egg

Eggs are white and oval, measuring 1.5 x  1.0 mm. They hatch after 7-16 days.

Quick Facts

Lifespan1 week
DistributionNative: Japan and Taiwan Invasive: Southeast Asia and the Pacific islands
HabitatAgricultural land, plantations, managed forests, orchards, natural forests, urban areas, and coastal regions
PredatorsWasps and other beetles
Host plants Asparagus, beans, broccoli, cabbage, cacao, corn, cotton, cucumber, eggplant, ginger, grape, green bean, okra, rose, soybeans, strawberry, and sweet potato.
Diet of adultsPlant tissue of host plants
Chinese Rose Beetle Damage

Identifying the Damage Caused by Them

The leaves these beetles feed on are completely skeletonized, with nothing but the veins remaining.

Did You Know

  • Adult beetles only use one side of their mouth to feed at a time.
Chinese Rose Beetle Image
Chinese Rose Beetle Picture

Image Source: lh6.ggpht.com, lh3.googleusercontent.com, researchgate.net, ctahr.hawaii.edu, inaturalist-open-data.s3.amazonaws.com,

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