Isolation and Microscopic Investigation of Entomopathogenic Nematodes (EPNs) Occurring in Barak Valley, Assam

Sharma, Rupak; Singha, Baby; Choudhury, Subhadeep Roy; sharma, Gouridutt

doi:10.20546/ijcmas.2018.704.208

Cited by 2 publications

(1 citation statement)

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“…However, treatment with S. feltiae at 160 IJs/cm −2 was found to be the next effective treatment. Hence, the results of the present study corroborate the finding of Sharma et al (2018) who reported that P. brassicae caused larval net mortality of 86.2 and 66.5% under laboratory conditions, respectively. Similar results were also reported by (Askary and Ahmad, 2020).…”

Section: Discussionsupporting

confidence: 92%

Bio-efficacy of entomopathogenic nematodes, Steinernema feltiae and Heterorhabditis bacteriophora against the Cabbage butterfly (Pieris brassicae [L.]) under laboratory conditions

Kasi

Singh

Waiba

et al. 2021

Egypt J Biol Pest Control

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Background Entomopathogenic nematodes (EPNs) have the potential to supersede larvicidal activity for the management of various insect pests. Result Lab experiments were conducted to test the pathogenicity of 2 EPNs local species; Steinernema feltiae and Heterorhabditis bacteriophora at different (IJs/cm2) concentrations against the cabbage butterfly, Pieris brassicae (L.). The native isolate was obtained from soil samples, collected from Rajgarh, Hamachi Pradesh, India. Petri dish bioassay used the EPNs species (S. feltiae HR1 and H. bacteriophora HR2) at the concentrations (0, 10, 20, 40, 80, 160 IJs/cm2). Based on the pathogenicity of the strains, only 2 isolates effectively showed larvicidal activity. The highest (%) (72.08 and 67.42%), at the 2nd instar larval mortality was recorded in the treatments with H. bacteriophora and S. feltiae at160 IJs/cm2, respectively. At the 4th instar larvae, respective larval mortality (85.38, 69.50%) was recorded in treatment with H. bacteriophora, and S. feltiae, respectively, at160 IJs/cm2. In case of pupae, the mortality rates were (62.12, 58.58%) for H. bacteriophora and S. feltiae, respectively, at 160 IJs/cm2; (74 and 12%) for both the tested EPNs, respectively, at 80 IJs/cm2. Percent of P. brassicae larval mortality treated with the tested EPN isolates was significantly higher than the untreated control. Results revealed that the percent of larval mortality significantly increased with the increase in time periods, being maximum at 72 h. S. feltiae and H. bacteriophora, strains showed potent larvicidal activity at low concentration even at 48 and 72 h of exposure. Conclusion This study revealed that the local strains of EPNs (S. feltiae HR1 and H. bacteriophora HR2) were found as a biocontrol agent against P. brassicae.

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Section: Discussionsupporting

confidence: 92%