Bio-efficacy of eco-friendly insecticides against Spodoptera littoralis (Lepidoptera: Noctuidae) in sugar beetroot ecosystem

Abstract

The field study conducted at Sakha Agricultural Research Station over two consecutive sugar beet growing seasons (2021-2022) aimed to assess the effectiveness of three eco-friendly insecticides in controlling Spodoptera littoralis (Boisduval) (Lepidoptera: Noctuidae) infestations while considering their impact on associated predator populations. The tested insecticides included Abhold® 36% SC (Spinetoram 6% + Methoxyfenozide 30%), Robek® WP 50% (Acetamiprid 22.7% + Bifenthrin 27.3%), and Pyridalyl 50% EC. Results revealed significant efficacy of all three insecticides in reducing S. littoralis larval populations, with Abhold®) demonstrating sustained efficacy over time causing an overall reduction of 93.05 and 97.34% during the 1^st and 2^nd seasons. However, Robek®) and Pleo®) treatments led to rapid reductions in associated predator populations, while Abhold®) maintained a more balanced approach, preserving predator populations. These findings highlight the importance of considering not only pest control efficacy but also the potential impacts on predator populations for long-term ecosystem stability in agricultural settings. Further research is warranted to comprehensively assess the ecological implications of these insecticides.