Pachymerus lacerdae

Pachymerus lacerdae is a species of beetle belonging to the family Bruchidae (seed beetles) within the order Coleoptera. This insect is recognized as a significant pest that specializes in infesting the seeds of various palm species. It poses a notable threat to botanical nurseries and agroforestry projects that rely on palm seed propagation.

The primary hosts of this beetle include seeds from palm genera such as Attalea and Syagrus. The larvae are the stage of the life cycle responsible for the damage, as they bore into the hard-coated seeds to consume the endosperm. This feeding behavior makes the seeds non-viable and destroys their potential for germination.

Regarding its biology, adult females deposit eggs on the surface of mature or developing fruits. Upon hatching, the larvae penetrate the seed coat and spend their entire developmental period inside the seed, where they eventually pupate. The duration of the life cycle is significantly influenced by ambient climate conditions, typically favoring warm and humid environments.

The damage caused by Pachymerus lacerdae is characterized by distinct, circular exit holes found on the seeds after the adult beetles emerge. The economic impact is profound in commercial palm cultivation, as the destruction of seeds directly correlates to the loss of propagation stock, reducing overall yield and potentially affecting the genetic diversity of the palm population.

Management and control strategies include:

• Strict implementation of phytosanitary measures during the transit of seeds.
• Visual inspection and mechanical removal of infected seeds before storage.
• Application of controlled atmosphere techniques to eradicate larvae within the seeds.
• Regular monitoring of seed warehouses using pheromone traps to detect adult activity.