author(s)
Gitanjali Devi, Mitul Saikia, Sudhansu Bhagawati and Badal Bhattacharyya

abstract
A field experiment was conducted at ICR Farm, AAU, Jorhat during the year 2019-20 to evaluate the efficacy of entomopathogenic nematode, Heterorhabditis bacteriophora at different application doses against cutworm, Agrotis ipsilon on potato. Lowest tuber damage was recorded at 5.0×10⁹ IJs/ha followed by at 2.5×10⁹ IJs/ha as compared to untreated control. Highest yield was recorded in the treatment at application dose 5.0×10⁹ IJs/ha. Cost benefit ratio revealed that application with higher dose of H. bacteriophora proved most effective followed by subsequent doses as well as neem pesticide.