Isolation, identification and efficacy of three bacterial isolates against the red palm weevil, Rhynchophorus ferrugineus (Olivier) (Coleoptera: Curculionidae)

Egyptian Journal of Biological Pest Control

Table 2 The LT₅₀ and LT₉₀ of second instar Rhynchophorus ferrugineus larvae exposed to three different concentrations of three tested bacterial isolates under controlled laboratory conditions

Conc. (CFU/ml)	Isolates	Slope	LT₅₀ (days)	Confidence intervals (95%)		LT₉₀ (days)	Confidence intervals (95%)		Intercept (a)	χ²
Conc. (CFU/ml)	Isolates	Slope	LT₅₀ (days)	Lower	Upper	LT₉₀ (days)	Lower	Upper	Intercept (a)	χ²
1 × 10⁴	K. pneumoniae	11.95	6.25	3.50	6.89	8.00	7.17	24.80	− 9.49	2.59
	S. marcescens	2.71	5.25	4.53	6.25	15.62	11.23	29.99	− 1.95	9.04
	B. thuringiensis	2.44	6.39	5.78	7.26	21.38	16.15	32.90	− 1.97	4.19
1 × 10⁶	K. pneumoniae	4.34	2.35	1.67	2.83	4.64	3.87	6.27	− 1.61	18.16
	S. marcescens	7.23	2.83	2.39	3.23	4.26	3.69	5.50	− 3.21	22.22
	B. thuringiensis	6.42	2.81	2.53	3.07	4.45	4.03	5.11	− 2.88 ±	8.66
1 × 10⁸	K. pneumoniae	4.33	2.28	1.54	2.78	4.50	3.74	6.24	− 1.54	19.84
	S. marcescens	6.32	2.51	1.47	3.19	4.00	3.16	8.60	− 2.52	55.34
	B. thuringiensis	7.95	2.67	2.01	3.26	3.88	3.20	6.62	− 3.40	45.47