Cashew nut borer

Systematic position. The cashew nut borer (Atheloca subrufella) belongs to the order Lepidoptera and the family Pyralidae. As a specialized pest, it is recognized for its capacity to cause significant economic disruption in tropical orchards, particularly within cashew-producing regions.

Host crops. The primary host for Atheloca subrufella is the cashew tree (Anacardium occidentale). The insect specifically targets the reproductive structures, posing a threat to both the inflorescences and the developing nut clusters, which are crucial for yield production.

Biology and life cycle. The life cycle consists of four distinct stages: egg, larva, pupa, and adult. The larvae are the primary damaging stage, characterized by rapid growth and high feeding activity. Under favorable tropical conditions, the pest can complete multiple generations in a single year, often coinciding with the peak flowering and fruiting period of the host tree.

Nature of damage and pest importance. Larvae bore into the floral buds and young fruits, creating tunnels that lead to the necrosis and premature shedding of the plant organs. This feeding behavior severely reduces the number of healthy nuts per cluster. In cases of high infestation, the pest can lead to catastrophic yield losses, making it a priority for plantation management.

Protection measures. Effective control requires a proactive management approach.

• Regular field scouting to detect early signs of larval damage.
• Targeted application of insecticides during the early flowering stages.
• Sanitary measures, such as the removal and destruction of infested flower panicles.
• Integration of natural biological control agents to keep pest population levels below the economic injury threshold.