TAILIEUCHUNG - Virulence of steinernima and heterorhabditis against black cutworm, Agrotis segetum (Lepidoptera: Noctuidae) in potato crop

The common cutworm (turnip moth) Agrotis segetum (Denis & Schiffermuller) is nearly cosmopolitan insect pest of potato. The efficacy of the entomopathogenic nematodes (EPN) Steinernema carpocapsae and Heterorhabditis indica was evaluated against different developmental stages of A. segetum under laboratory conditions. In laboratory studies, significant mortality of second instar larvae was recorded by H. indica ( per cent) and per cent by S. carpocapsae after 48 hrs of treatment at EPNs suspension of 50-300 IJs/ml (1 ml per larva). In the preliminary bioassay study, all the tested EPNs were capable to cause maximum mortality within three to five days of treatment. The highest mortality (100 per cent) of fourth instar larvae and pupae was observed at more than 200 IJs/ml nematodes suspension of S. carpocapsae and H. indica after five days of treatment. At nematodes suspension 50 IJs/ml, per cent mortality of fourth instar was recorded by S. carpocapsae and per cent by H. indica after five days of treatment. The pupae of A. segetum were less susceptible to EPNs infections as compared to larvae due to reduced number of portal entries. | Virulence of steinernima and heterorhabditis against black cutworm, Agrotis segetum (Lepidoptera: Noctuidae) in potato crop

• Sinh học
• Steinernima and heterorhabditis black cutworm
• Agrotis segetum
• Potato crop
• Five days of treatment
• Reduced number of portal entries