Egyptian Journal of Biological Pest Control

Table 3 Pathogenicity of 12 Bt isolates and a reference strain (HD1) against the 3rd instar larvae of D. melanogaster after 24 and 48 h post-treatment

From: Isolation and identification of Bacillus thuringiensis strains native of the Eastern Province of Saudi Arabia

Strain	D. melanogaster (Diptera)
	24 h		Mortality %	48 h		Mortality %
	LC₅₀ (μg/ml⁻¹)	Slope ± SE	Mortality %	LC₅₀ (μg/ml⁻¹)	Slope ± SE	Mortality %
1	25.18	0.8 ± 0.9	54	16.8	0.9 ± 0.9	60
2	56.7	1.7 ± 0.9	42	44.4	1.7 ± 1.0	48
3	22.1	0.4 ± 0.9	27	445.6	0.4 ± 0.9	30
4	31.4	1.8 ± 1.0	57	55.0	3.8 ± 1.3	61
5	66.6	5.2 ± 1.6	70	52.6	4.0 ± 1.8	75
6	62.5	4.8 ± 1.4	73	54.4	5.6 ± 1.6	80
7	125.4	0.4 ± 0.9	39	50.0	0.8 ± 0.9	50
8	59.4	3.7 ± 1.2	39	55.4	3.5 ± 2.5	46
9	48.1	4.2 ± 3.0	80	54.4	5.2 ± 1.6	93
10	55.0	4.4 ± 1.3	86	32.5	4.3 ± 1.7	86
11	19.9	0.4 ± 0.9	51	20.2	0.8 ± 0.9	63
12	37.8	3.0 ± 0.7	57	19.3	0.4 ± 0.9	70
HD1	36.6	1.3 ± 0.9	51	20.2	0.8 ± 0.9	63

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