TABLE 2.

Mortality (mean ± SE)% of L2 and L4 instar H. armigera treated with endophytic B. bassiana (Bb: 1 × 10⁸ conidia ml⁻¹) alone and in combination with B. thuringiensis (Bt1: 0.50; Bt2: 0.75; Bt3: 1.0 μg ml⁻¹).

Treatments	Second instar				Fourth instar
	Observed mortality (%)	Expected mortality	CTF	Type of interaction	Observed mortality (%)	Expected mortality	CTF	Type of interaction
Bb	27.13 ± 1.36d				19.69 ± 1.19e
Bt1	19.96 ± 1.11d				14.87 ± 1.07e
Bt2	33.64 ± 2.02d				25.74 ± 1.25de
Bt3	58.05 ± 2.80bc				49.36 ± 2.34bc
Bb + Bt1	49.07 ± 2.13c	47.09	4.03	Additive	35.92 ± 1.70cd	34.56	3.78	Additive
Bb + Bt2	77.40 ± 3.10a	60.77	21.48	Synergistic	58.82 ± 2.77a	45.43	22.76	Synergistic
Bb + Bt3	68.38 ± 3.03ab	85.18	−24.5	Antagonistic	53.45 ± 2.31ab	65.05	−21.70	Antagonistic
df	6		-	-	6		-	-
F	40.6		-	-	31.6		-	-
P	≤ 0.05		-	-	≤0.05		-	-

Means followed by the same letters within each column are not significantly different; HSD test P ≤ 0.05.