Shining leaf chafer

Systematic position: Anomala splendens belongs to the order Coleoptera, family Scarabaeidae, and subfamily Rutelinae. It is a member of the leaf chafer group, known for its distinct morphological features and significant impact on both vegetation and soil health throughout its life stages.

Host crops and damage: The pest attacks a wide range of agricultural and horticultural crops, including ornamental plants and fruit trees. Adult beetles are primarily folivorous, causing skeletonization of leaves, while the larvae, commonly known as grubs, live in the soil and feed on plant roots. This dual-action damage profile makes the pest particularly detrimental to young nursery plants and field crops.

Biology and life cycle: The life cycle of Anomala splendens involves distinct subterranean and aerial phases. Females lay eggs in the soil, where the larvae develop and pass through several instars. The larval stage is the longest part of the life cycle, focusing on root consumption. Upon reaching maturity, the larvae pupate in the soil, eventually emerging as adults to mate and complete the cycle.

Economic impact: The economic significance of this pest lies in the rapid destruction of plant health. In nurseries, infestation can lead to the complete loss of seedling batches. Furthermore, the damage to the root system caused by larvae creates entry points for soil-borne pathogens, potentially leading to secondary infections that worsen the overall plant condition.

Control measures: Management of Anomala splendens requires integrated pest management (IPM) practices:

• Cultural control via timely tillage to expose and mechanically kill soil-dwelling grubs.
• Chemical control using targeted soil insecticides or foliage sprays during adult flight periods.
• Biological control through the application of entomopathogenic nematodes or fungi like Metarhizium anisopliae.
• Crop rotation and soil management to reduce the attractiveness of the area for egg-laying females.