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

Egyptian Journal of Biological Pest Control

Table 3 Efficacy of different concentrations of the entomopathogenic nematode Heterorhabditis bacteriophora (HP88) against larval instars of Spodoptera littoralis under laboratory condition

Nematode concentrations	Mean % mortality 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	44.44	68.88	100	71.11	51.11	80	100	77.04	17.78	73.33	100	63.70	20	77.77	97.77	65.18	22.22	48.88	68.89	46.66
100	57.77	82.22	100	80	44.18	72.09	100	72.09	28.89	73.33	100	67.41	31.82	100	100	77.27	13.33	35.55	84.44	44.44
200	64.44	100	100	88.15	71.11	100	100	90.37	60	71.11	100	77.04	70.46	100	100	90.15	22.22	66.66	100	62.96
400	97.78	100	100	99.26	100	100	100	100	88.89	100	100	96.30	100	100	100	100.00	24.44	86.67	100	70.37
800	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100.00	48.89	100	100	82.97
1600	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100.00	37.78	84.44	100	74.07
F value	2.59				2.64				2.39				1.66 insig.				6.19
LSD	23.895				24.378				34.072								19.498