Virulence effect of Metarhizium anisopliae (Met.) and Beauveria bassiana (Bals.) fungi against the peach fruit fly, Bactrocera zonata (Saunders) (Diptera: Tephritidae)

Egyptian Journal of Biological Pest Control

Table 2 Lethal time values (LT₅₀ and LT₉₀ (day)) for Bactrocera zonata fly treated with different fungal concentrations of Metarhizium anisopliae and Beauveria bassiana under laboratory conditions

Fungus concentration (conidia/ml)	LT₅₀ (day)	LT₉₀ (day)	χ²	χ² tabulated	p	Slope ± SE
M. anisopliae
2.3 × 10⁶	9.48	42.99	8.16	12.6	0.23	1.95 ± 0.20
1.2 × 10⁶	13.69	65.95	8.29	12.6	0.39	1.88 ± 0.21
6.0 × 10⁵	18.27	81.58	6.38	12.6	0.38	1.97 ± 0.24
4.0 × 10⁵	24.37	98.90	5.53	11.1	0.35	2.11 ± 0.32
2.0 × 10⁵	28.58	100.1	3.84	9.5	0.43	2.65 ± 0.46
B. bassiana
2.3 × 10⁶	13.33	51.64	9.52	12.6	0.23	2.18 ± 0.23
1.2 × 10⁶	17.55	65.34	12.00	12.6	0.09	2.42 ± 0.26
6.0 × 10⁵	22.44	99.75	11.58	12.6	0.07	1.98 ± 0.25
4.0 × 10⁵	28.99	103.99	10.11	11.1	0.49	2.31 ± 0.36
2.0 × 10⁵	30.03	124.52	3.76	7.8	0.39	3.76 ± 0.65

LT₅₀—Median time needs to achieve 50% mortality of the tested individuals, χ²—Chi-square, P—probability level of 5%, SE—standard error