Surinam cockroach

Systematic position: The Surinam cockroach (Pycnoscelus surinamensis) is a member of the order Blattodea and the family Blaberidae. It is a well-known pest that thrives in artificial environments, such as greenhouses, nurseries, and indoor plant collections.

Crops damaged: This insect is a significant concern for potted plants and ornamental horticulture. It frequently targets the root systems of tropical plants, including ferns, palms, orchids, and various broadleaf evergreens, often remaining hidden until significant damage to the plant's health has occurred.

Biology and life cycle: The species is primarily parthenogenetic, meaning females can reproduce without mating, which enables rapid colony expansion in greenhouses. These cockroaches are nocturnal and fossorial, spending most of their time burrowing in moist soil or organic mulch, where they are protected from environmental fluctuations.

Nature of damage and economic impact: The damage is caused by both adults and nymphs feeding on root hairs and primary roots. This subterranean activity deprives the plant of necessary nutrients and water. Affected plants show signs of chlorosis, wilting, and stunted growth, which can lead to significant economic losses in commercial nurseries.

Protection measures: Effective management relies on an integrated approach.

• Sterilizing potting soil before use to eliminate nymphs.
• Maintaining optimal soil moisture to discourage excessive burrowing.
• Applying soil-drench insecticides containing imidacloprid or similar systemic agents.
• Using sticky traps placed near pots to monitor adult movement.