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Himachal Pradesh is a northern state of India and is situated to the southern of the mighty Himalaya. The agro-climatic conditions are conducive for the production of off-season vegetables. Biological control by entomopathogenic nematodes (EPNs) is one of the alternatives to manage the turnip moth, Agrotis segetum (Denis u0026 Schiffermuller) (Lepidoptera: Noctuidae). The present study was, therefore, undertaken with the objective to assess the virulence of local EPN isolates from Himachal Pradesh, Heterorhabditis sp., against pests to minimize the use of insecticides during crop protection. Against L3–L5 of A. segetum, Heterorhabditis indica was found highly effective, resulting in 33.33–93.33% mortality at 40 infective juveniles (IJs)/larva after 96 h of treatment. Among local isolates, Heterorhabditis sp. (HSG) influenced maximum mortality of L3 and L4, whereas in L5, H. bacteriophora (HRJ) influenced maximum mortality. The sensitivity of L3 to different EPNs was (7.0–16.6%) higher than that of L4. In soil bioassay carried out against L4 of A. segetum, H. bacteriophora (HRJ) was found highly effective, followed by Heterorhabditis sp. (HKM) and Heterorhabditis sp. (HSG) at 10,000 IJs/kg of soil. The mortality varied from 78.33 to 81.67% with local isolates after 7 days of treatment. The results suggested that EPNs can be used as one of the components for managing A. segetum under field and greenhouse conditions to reduce over dependence on insecticides.

egyptian journal of biological pest control

Biological control potential of North West Himalayan strains of heterorhabditid nematodes against the turnip moth, Agrotis segetum (Denis &amp; Schiffermuller) (Lepidoptera: Noctuidae)