Evaluation of Pathogenicity of Entomopathogenic Oomycetes Lagenidium giganteum and L. ajelloi against Anopheles Mosquito Larvae

Table 1

Lower and upper limits for LC₅₀ of Lagenidium giganteum and L. ajelloi zoospores of the A. gambiae larvae at various time intervals.

Fungal species	Time in hours	LC50 lower limit (zoospores/ml)	LC50 (zoospores/ml)	LC50 upper limit (zoospores/ml)	SE
L. ajelloi	24	2.14 × 10^4	1.18 × 10^5	2.15 × 10^5	±97148.20
	48	1.27 × 10^4	1.43 × 10^4	1.58 × 10^4	±803.61
	72	1.67 × 10^2	6.05 × 10^2	9.98 × 10^2	±285.609
	96	3.261	27.084	51.842	±22.72
L. giganteum	24		Nil
	48		Nil
	72	2.06 × 10^4	2.32 × 10^4	2.58 × 10^4	±1326.12
	96	2.87 × 10^3	3.51 × 10^3	4.14 × 10^3	±325.45

Larval mortalities increased with exposure time and lower LC₅₀ observed with L. ajelloi zoospores indicated that L. ajelloi is more toxic to A. gambiae larvae compared to L. giganteum.