Two-spotted beetle

Popillia biguttata belongs to the Scarabaeidae family within the order Coleoptera. This species is recognized in agricultural contexts for its potential to cause damage to vegetation. As a scarab beetle, it shares morphological similarities with other members of its genus, but its specific behavior and habitat requirements distinguish it within the local ecosystems.

This pest affects a wide range of host plants, including various broadleaf crops, horticultural plants, and orchard trees. The adult beetles exhibit phytophagous behavior, feeding primarily on foliage, while the larvae are subterranean, impacting the root systems of grasses and young agricultural crops during their development.

The life cycle of the insect consists of complete metamorphosis: egg, larva, pupa, and adult. Eggs are typically deposited in soil rich in organic matter. The larval stage, often referred to as a white grub, lives in the soil, feeding on roots and decaying organic material, which can cause significant damage to the host plant's ability to uptake water and nutrients.

The economic impact of the pest is twofold. Adult feeding leads to significant defoliation, which impairs photosynthesis and overall plant vigor, while larval feeding in the soil causes root pruning. This dual attack significantly reduces crop yield, decreases the plant's resistance to environmental stress, and can lead to plant mortality in high infestation scenarios.

Effective management requires an integrated approach to minimize the population density:

• Cultural practices such as deep tillage to disrupt the soil-dwelling larval stages.
• Monitoring flight activity of adults to determine optimal timing for pesticide application.
• Application of selective insecticides during the peak feeding phase of the adults.
• Biological control measures, including the use of parasitic nematodes or entomopathogenic fungi designed to target larvae in the soil.