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Lethal effect of the entomopathogenic nematode, Steinernema feltiae, against prepupae of Helicoverpa armigera (Hb) (Lepidoptera: Noctuidae) in soil was evaluated. Plasma phenoloxidase activity of H. armigera prepupae against S. feltiae also was evaluated. In brief, 20–25 infective juveniles (IJs) of S. feltiae in 20 μl Ringer’s solution were injected into the hemolymph of H. armigera prepupae in different time intervals. In order to evaluate the effect of the Ringer’s solution, it was also injected into the larvae in a separate experiment as positive control. A third group of non-injected insects was used as negative control. Hemolymph of the insects was collected in different time intervals (0 to 24 h post injection). Phenoloxidase (PO) activity of H. armigera hemolymph was determined spectrophotometrically, using l-Dopa as substrate. The LC20, LC50, and LC80 values were 4.5, 19, and 76 IJs per insect, respectively. PO activity assay demonstrated higher levels of PO unit in nematode-injected insects compared to control groups. Nematode-injected insects showed the highest plasma PO activity 8 h post-injection.

egyptian journal of biological pest control

Effect of entomopathogenic nematode, Steinernema feltiae, on survival and plasma phenoloxidase activity of Helicoverpa armigera (Hb) (Lepidoptera: Noctuidae) in laboratory conditions