Cape lappet moth

Systematic position. The Cape lappet moth (Pachypasa capensis) belongs to the order Lepidoptera and the family Lasiocampidae. It is a large moth species native to Africa, primarily known for its role as a significant defoliator in both agricultural and forest ecosystems.

Affected crops. The species exhibits a broad host range, posing a threat to various plant species. It is particularly damaging to commercial citrus orchards, apple trees, and pears. Furthermore, the larvae are frequently observed feeding on various indigenous trees like acacias and eucalyptus, causing widespread damage in managed environments.

Biology and life cycle. The life cycle consists of the egg, larval (caterpillar), pupal, and adult stages. Females lay their eggs in clusters on branches or leaves. Larvae emerge and progress through several instars, feeding voraciously. They often pupate in protected sites, such as bark crevices or folded leaves, and overwinter as larvae in cooler conditions.

Nature of damage and economic impact. The primary economic impact stems from larval feeding activity. As caterpillars grow, their appetite increases, leading to severe defoliation. This rapid consumption of foliage reduces the tree's ability to produce energy, resulting in stunted fruit development, poor yields, and, in severe infestations, the death of young saplings.

• Regular scouting of orchards to detect early larval activity.
• Manual removal of caterpillar colonies and egg clusters.
• Application of microbial insecticides based on Bacillus thuringiensis.
• Use of targeted contact insecticides when infestation levels exceed economic thresholds.
• Implementation of Integrated Pest Management (IPM) to preserve beneficial predators.