Cassava moth

The cassava moth (Pyralis manihotalis) is a member of the order Lepidoptera and the family Pyralidae. It is recognized primarily as a significant pest of stored agricultural products, thriving in various tropical and subtropical environments around the world.

This species is known to infest a wide variety of plant-based materials. While it is particularly associated with the roots of the cassava plant, it also feeds on stored grain products, oilseeds, dried fruits, and other organic agricultural commodities. It is a persistent threat in environments where sanitation and humidity controls are inadequate.

The biology of the cassava moth involves a complete metamorphosis cycle consisting of egg, larva, pupa, and adult stages. The larvae are the primary damaging agents, exhibiting high voracity and developing rapidly when moisture levels are sufficient. The species can complete multiple generations in a single year, which poses a constant challenge for warehouse management.

The damage caused by Pyralis manihotalis is both qualitative and quantitative. Larvae consume the substrate and contaminate it with silk webbing, excrement, and cocoon fragments. This degradation often renders the stored products unsalable and unsuitable for human or animal consumption due to increased risks of secondary mold growth.

Effective management and control strategies are essential to minimize losses caused by this pest. Recommended practices include:

• Implementing strict temperature and humidity management within storage facilities.
• Regular fumigation of premises to eliminate hidden populations.
• Maintaining high standards of warehouse hygiene and removing spillages.
• Deploying pheromone traps to monitor adult flight activity and density.