Psilopholis vestita

Psilopholis vestita is a significant species of scarab beetle within the family Scarabaeidae. This insect is recognized as a serious agricultural pest, particularly in regions where tea and coffee plantations are the primary source of economic stability, causing notable losses in crop yield.

Taxonomically, the species belongs to the order Coleoptera. It has a broad host range, focusing primarily on the root systems of permanent crops. Young seedlings are particularly susceptible, as a few larvae can completely sever the main root, leading to rapid plant mortality in the field.

The biological cycle of this pest is characterized by a prolonged larval stage spent in the soil. The larvae, typical grubs, remain in the rhizosphere for several months or even years, feeding on organic matter and living roots. The adult stage, while less destructive to roots, also impacts the foliage and facilitates the spread of the population.

In terms of damage, infestation results in stunted plant growth, chlorosis, and widespread wilting. Because the damage occurs underground, early detection is difficult, making the pest particularly insidious. Once symptoms appear above ground, the damage to the root system is often irreversible.

Integrated Pest Management (IPM) is essential for controlling this beetle:

• Soil application of contact and systemic insecticides during high-risk seasons.
• Introduction of entomopathogenic fungi to suppress larval populations naturally.
• Mechanical cultivation to expose larvae to surface predators.
• Use of light traps to monitor adult flight periods and timing control measures.