| Popis: |
Spodoptera litura larvae were exposed to 10, 20, 30 and 40 infective juveniles (IJ) of each species of entomopathogenic nematodes (EPN): Heterorhabditis bacteriophora (HRJ), Heterorhabditis sp. (HSG), Heterorhabditis sp. (HKM)) and a commercial formulation of H. indica for four different time periods and they were found to be susceptible to all the EPN tested. Appreciably acceptable performance was attained by H. bacteriophora (HRJ), which exhibited 91.7% mortality of S. litura larvae in 96 h exposure period against third instar larvae, while H. indica produced 83.0% mortality. All the tested EPN species were also found to reproduce within the host and produce first generation infective juveniles. This study concluded that all the three tested indigenous EPN species produced > 90.0% mortality of third instar larvae of S. litura. All tested EPN were also found to replicate within the host and maximum production of IJ was recorded in H. indica (26.3 ± 3.76 × 103 IJ larva–1) and H. bacteriophora (HRJ) (26.0 ± 1.73 × 103 IJ larva–1) at the concentration of 40 IJ larva–1. |
