Efficacy of entomopathogenic nematodes against Spodoptera littoralis (Boisd.) and Agrotis ipsilon (H.) (Lepidoptera: Noctuidae)

Egyptian Journal of Biological Pest Control

Table 4 Efficacy of different concentrations of the entomopathogenic nematode Heterorhabditis bacteriophora (HP88) against larval instars of Agrotis ipsilon under laboratory condition

Nematode concentrations	Mean % of larval instars at different exposure times
IJs/dish	2nd instar				3rd instar				4th instar				5th instar				6th instar
	24 h	48 h	72 h	Average	24 h	48 h	72 h	Average	24 h	48 h	72 h	Average	24 h	48 h	72 h	Average	24 h	48 h	72 h	Average
50	31.11	57.77	73.33	54.07	28.88	55.55	64.44	49.63	8.88	73.33	84.44	55.55	15.55	31.11	48.89	31.85	15.9	40.9	68.18	41.66
100	42.22	75.55	97.77	71.85	32.55	44.18	86.04	54.26	18.18	47.72	90.9	52.27	6.81	52.27	84	47.69	13.33	35.55	80	42.96
200	55.55	75.55	100	77.03	62.22	73.33	100	78.52	28.88	64.44	100	64.44	27.27	54.54	100	60.60	17.77	40	97.78	51.85
400	35.55	51.11	100	62.22	22.72	65.9	100	62.87	17.77	73.33	100	63.7	26.66	64.44	100	63.7	24.44	60	100	61.48
800	82.22	95.55	100	92.59	53.33	97.77	100	83.7	15.9	95.45	100	70.45	58.13	81.39	100	79.84	46.67	64.44	100	70.37
1600	73.33	93.33	100	88.89	55.55	91.11	100	82.22	35.55	86.66	100	74.07	44.18	100	100	81.39	42.85	90.47	100	77.77
F value	6.51				5.64				2.02				7.92				7.37
LSD	18.452				19.774				18.548				21.274				17.114