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

Egyptian Journal of Biological Pest Control

Table 1 Efficacy of different concentrations of the entomopathogenic nematode Steinernema monticolum against larval instars of Spodoptera littoralis in the laboratory

Nematode concentrations	Mean % mortality of larval instars at different exposure times
IJs/dish	2nd instar				3rd instar				4th instar				5th instar				6th instar
IJs/dish	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	22.22	46.66	77.78	48.88	15.55	31.11	55.55	34.07	2.22	60	75.55	45.92	2.32	27.9	58.13	29.45	4.76	21.42	45.23	23.80
100	28.88	60	93.33	60.71	16.27	37.2	69.76	41.07	11.11	46.66	82.22	46.66	6.66	42.22	75.55	41.47	6.66	35.55	66.66	36.29
200	31.11	53.33	86.66	57.03	17.77	53.33	71.11	47.40	15.55	57.77	80	51.11	17.7	55.55	82.22	51.82	9.52	38.09	64.28	37.29
400	35.55	51.11	91.11	59.25	22.72	65.9	90.9	59.84	17.77	73.33	95.54	62.21	26.66	64.44	97.77	62.95	24.44	60	91.1	58.51
800	44.44	46.66	100	63.7	24.44	60	95.55	59.99	6.66	93.33	100	66.66	30.23	72.09	100	67.44	35.71	52.38	100	62.69
1600	31.11	57.77	100	62.96	40	55.55	100	65.18	17.77	84.44	100	67.40	34.88	67.44	100	67.44	42.85	61.9	100	68.25
F value	2.54				7.58				3.38				61.11				25.26
LSD	10.75				14.09				17.01				6.25				11.123