Isolation, identification and virulence of indigenous entomopathogenic fungal strains against the peach-potato aphid, Myzus persicae Sulzer (Hemiptera: Aphididae), and the fall armyworm, Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae)

Egyptian Journal of Biological Pest Control

Table 6 Median lethal concentration (LC₅₀) values for the indigenous strains of entomopathogenic fungi Beauveria bassiana and Metarhizium anisopliae bioassayed against 3rd instar larvae of fall armyworm Spodoptera frugiperda under laboratory conditions

EPF strains	Time (days)	LC₅₀ (conidia/ml)	Lower and upper 95% Fiducial Limits (conidia/ml)	X² (df = 30)*	P-value	Slope ± SE
Beauveria bassiana	10 d	2.839E + 07	1.818E + 07 – 4.423E + 07	33.379	≥ 0.001	0.472 ± 0.029
Metarhizium anisopliae	10 d	8.843E + 05	2.973E + 05 – 1.901E + 06	25.809	≥ 0.001	0.356 ± 0.025

*Since the significance level is less than 0.150, a heterogeneity factor is used in the calculation of confidence limits