Abstract

Author:
Md. Rakibul Islam Jonya, Gopal Das, Masum Ahmad

Doi: 10.26480/trab.01.2026.26.32

This is an open access article distributed under the Creative Commons Attribution License CC BY 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited

In the present study, the impacts of six insecticides commonly used by Bangladeshi brinjal farmers were evaluated on the abundance and biodiversity of arthropod pests and beneficial insects in brinjal ecosystem. The tested insecticides were: Tracer 45 SC (Spinosad), Belt Expert 48 SC (Flubendiamide 24% + Thiacloprid), Caprid 95 SP (Cartap + Acetamiprid), Fairhit 20 EC (Pyriproxyfen + Fenpropathrin), Thiami 70 WDG(Thiamethoxam + Imidacloprid) and Lumectin 10 WDG (Lufenuron + Emamectin Benzoate). The experiment was conducted using a randomized complete block design (RCBD) with four replications. The samples were collected at 10-days interval throughout the cropping period using sweep net, pitfall traps and yellow sticky traps. We have identified 54 morphospecies under 36 families and 10 orders and classified into five functional categories namely: herbivores, predators, parasitoids, pollinators, and detritivores. Among the orders, Coleoptera (13) was the most dominant, followed by Hemiptera (10), Diptera (9), Hymenoptera (7), Lepidoptera (4), Araneae (3), Orthoptera (3), Neuroptera (2), Thysanoptera (2) and Ispotera (1). Among six tested insecticides, Thiami 70 WDG @ 0.3g/L provided the highest pest suppression but resulted in the lowest Simpson biodiversity index and highest equitability, indicating low compatibility with beneficial insects and potentially harmful for brinjal ecosystem. In contrast, Tracer 45 SC @ 0.4 ml/L provided the highest efficacy against pest while maintaining the highest biodiversity index and lowest equitability that is close to the control, highlighting its ecological compatibility. In conclusion, the present study showed that insecticide selection potentially influences pest control and arthropod biodiversity, therefore, Tracer 45 SC @ 0.4 ml/L is recommended for effective pest control and maintaining highest biodiversity and lowest equitability and can be integrated into sustainable brinjal IPM programs.