Antifungal activity of local isolates of Beauveria bassiana (Balsamo) Vuillemin against Verticillium dahliae Kleb. causing wilt disease of cotton

Egyptian Journal of Biological Pest Control

Table 3 Percentage of inhibition of Verticillium dahliae by Beauveria bassiana under in vitro conditions

Isolate code	Isolate PHCVd3			Isolate PHCVd47
Isolate code	Mycelial growth (mm)^a	MGI (%)	Bell’s scale**	Mycelial growth (mm)^a	MGI (%)	Bell’s scale**
Application of B. bassiana to the medium, 2 days before V. dahliae
ET 10	33.3 c*	62.8	S2	31.4 c	55.8	S3
ET 101	29.0 c	67.6	S2	27.2 c	61.7	S2
BMAUM-M6-4	43.3 b	51.6	S3	41.7 b	41.3	S4
Bb1	15.8 d	82.3	S1	16.0 d	77.5	S1
Bb18	13.2 d	85.3	S1	13.0 d	81.7	S1
Control	89.5 a	0.0	–	71.0 a	0.0	–
CD _{(p= 0.01)}	13.8			14.5
Application of B. bassiana and V. dahliae to the medium at 2 days
ET 10	32.3 c*	63.9	S2	33.2 c	53.2	S3
ET 101	38.3 c	57.2	S3	38.4 b	45.9	S4
BMAUM-M6-4	45.9 b	48.7	S4	40.6 b	42.8	S4
Bb1	17.4 d	80.6	S1	25.6 d	63.9	S2
Bb18	19.9 d	77.8	S1	17.2 e	75.8	S1
Control	89.5 a	0.0		71.0 a	0.0	–
CD _{(p= 0.01)}	13.5			9.7

^aData are means of five replicates, *Means followed by different letters within a column are significantly different according to Duncan's test (P ≤ 0.01), MGI: Mean growth inhibition (%), CD: Critical difference, **Bell’s Scale: S1: Antagonist completely overgrew test pathogen, S2: Antagonist overgrew 2/3rd growth of test pathogen, S3: Antagonist colonized half of test pathogen, S4: Test pathogen overgrew 2/3rd growth of antagonist and S5: Test pathogen completely overgrew antagonist