Entomopathogenic soil bacteria as biocontrol agents against Spodoptera litura (Fab): A sustainable approach

IF 2.4 3区生物学 Q1 ZOOLOGY

Journal of invertebrate pathology Pub Date : 2025-09-23 DOI:10.1016/j.jip.2025.108464

Pallvi Mehra , Arushi Mahajan , Prince Dhammi , Satish Koundal , Harvinder Singh Saini , Sanehdeep Kaur

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引用次数: 0

Abstract

Spodoptera litura (Fabricius) (Lepidoptera: Noctuidae), commonly known as the tobacco caterpillar, is a polyphagous pest found worldwide, causing considerable damage to a variety of agricultural crops. The overuse of chemical insecticides against S. litura has led to the development of resistance, residue problem and ecological imbalance. To address these issues, sustainable and eco-friendly alternatives like microbial control has emerged as a key strategy in integrated pest management. Therefore, the present study was undertaken to assess the insecticidal properties of soil bacteria as potential biocontrol agents against S. litura. Among the screened bacteria, Planococcus sp. (KIC5), Rhodococcus sp. (MG1) and Comamonas sp. (C2) caused 82, 80 and 78 % mortality respectively, compared to 8 % in control S. litura larvae treated with leaves dipped in PBS only. Besides larvicidal activity, these bacteria also prolonged the overall development period with a prolongation of 5.63 days due to MG1, decreased adult emergence and caused morphological abnormalities in S. litura. A remarkable effect was also observed on nutritional indices of S. litura larvae in the form of decreased relative growth rate (RGR), relative consumption rate (RCR), efficiency of conversion of ingested food (ECI), efficiency of conversion of digested food (ECD), and altered approximate digestibility (AD). The significant adverse effects of KIC5, MG1 and C2 on various biological and nutritional parameters of S. litura indicate their potential as effective biocontrol agents against S. litura.

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昆虫病原土壤细菌作为斜纹夜蛾（Spodoptera litura）的生物防治剂：一种可持续的方法。

斜纹夜蛾（Spodoptera litura (Fabricius)）（鳞翅目：夜蛾科），俗称烟草毛虫，是一种遍布世界各地的多食性害虫，对多种农作物造成相当大的危害。化学杀虫剂对斜纹夜蛾的过度使用导致了其抗药性、残留问题和生态失衡。为了解决这些问题，微生物控制等可持续和生态友好的替代方案已成为综合虫害管理的关键战略。因此，本研究旨在评价土壤细菌作为潜在的生物防治剂对斜纹夜蛾的杀虫性能。在筛选到的细菌中，Planococcus sp. （KIC5）、Rhodococcus sp. （MG1）和Comamonas sp. （C2）的死亡率分别为82%、80%和78% %，而对照的斜纹山楂幼虫仅用叶片蘸PBS处理，死亡率为8 %。这些细菌除具有杀幼虫作用外，还能延长斜纹夜蛾的整体发育周期，由于MG1的作用，延长了5.63 d，减少了成虫的羽化，并造成了形态异常。对斜纹夜蛾幼虫的营养指标也有显著影响，表现为相对生长率（RGR）、相对摄食率（RCR）、摄入食物转化效率（ECI）、消化食物转化效率（ECD）和近似消化率（AD）的降低。KIC5、MG1和C2对斜纹夜蛾的各种生物学和营养参数均有显著的不良影响，表明其具有作为斜纹夜蛾有效生物防治剂的潜力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of invertebrate pathology 生物-动物学

CiteScore

6.10

自引率

5.90%

发文量

审稿时长

1 months

期刊介绍： The Journal of Invertebrate Pathology presents original research articles and notes on the induction and pathogenesis of diseases of invertebrates, including the suppression of diseases in beneficial species, and the use of diseases in controlling undesirable species. In addition, the journal publishes the results of physiological, morphological, genetic, immunological and ecological studies as related to the etiologic agents of diseases of invertebrates. The Journal of Invertebrate Pathology is the adopted journal of the Society for Invertebrate Pathology, and is available to SIP members at a special reduced price.