New Study Reveals Hidden Allies Against Banana Pest: Parasitic Wasps Offer Sustainable Control in Costa Rica

New Research Highlights Parasitoids as Key to Sustainable Banana Farming

A groundbreaking study published in the International Journal of Tropical Insect Science has uncovered natural parasitoid allies that could revolutionize pest management in Costa Rican banana plantations. Researchers investigated the parasitic wasps targeting Diaspis boisduvalii — a scale insect notorious for damaging banana crops and raising control costs.

Over a five-month field study across six plantations, scientists identified four parasitoid species: Aphytis sp., Coccobius sp., Plagiomerus peruviensis, and Ablerus sp. This marks the first recorded association between the Boisduval scale and three of these wasps. The results revealed that high insecticide use drastically reduced parasitism rates, while selective herbicide use affected each parasitoid species differently.

Interestingly, Plagiomerus peruviensis showed stronger resilience under herbicide conditions and appears to reproduce through thelytokous parthenogenesis — a form of asexual reproduction that could enhance population recovery and pest suppression.

The findings emphasize that reducing pesticide dependency can help restore natural pest regulation, promoting biodiversity and crop resilience. The authors urge further exploration of pesticide selectivity and biological interactions to enhance sustainable pest control strategies in tropical agroecosystems.

Reference

Solano-Gutiérrez, M. V, Guillén-Sánchez, C., & Hanson, P. (2025). Parasitoids (Hymenoptera) of Diaspis boisduvalii (Hemiptera: Diaspididae) in Costa Rican banana plantations: assessing responses to insecticide and herbicide use. International Journal of Tropical Insect Science. https://doi.org/10.1007/s42690-025-01638-w