Invasiveness of Thrips parvispinus in Bangladesh: A recent threat to crop production

Abstract Introduction: Thrips parvispinus (Karny) (Thysanoptera: Thripidae) is an emerging invasive pest that has rapidly expanded its geographical range, affecting agricultural production across multiple continents. Methods : This study investigated the presence, damage, and host range of T. parvispinus in Bangladesh through field surveys in key vegetable and fruit-growing regions. Thrips were collected from leaves, flowers, and fruits using aspirators, preserved in 70% ethanol, and identified morphologically under a stereo microscope following standard keys. Infestation levels, damage symptoms, and GPS-based distribution were recorded. Results : The study confirmed the presence and infestation of T. parvispinus on a number of agricultural crops, with chili ( Capsicum annuum ), eggplant ( Solanum melongena ), and papaya ( Carica papaya ) being the most severely affected. Infestation levels were particularly high in chili fields, where 10 thrips per flower were recorded, with an estimated yield loss ranging between 30 and 70% . Damage symptoms included leaf curling, necrotic streaks, flower abortion, and fruit malformation , which are typical of this pest elsewhere. Farmers majorly used synthetic pesticides to manage this pest. However, there was evidence that insecticide applications have failed to control T. parvispinus . This poses a risk of pesticide resistance and harm to other beneficial insects. These findings are similar to the impacts reported from Indonesia, India, Spain, and Florida, USA, where T. parvispinus has become a major agricultural threat. Conclusion : Given its rapid establishment and negative impacts, integrated pest management (IPM) strategies , including cultural practices, biological control, and strict phytosanitary measures, are essential to mitigate further spread. This study proposes for implementing proactive monitoring and sustainable pest control strategies to safeguard Bangladesh’s agricultural productivity.