Fig. 4

Biocontrol abilities of the B.cereus 0–9, ΔamyS, ΔamyS/amyS and ΔamySec strains on wheat sharp eyespot. Fresh wheat roots were assessed according to the disease grading scale of wheat sharp eyespot, and the biocontrol abilities of the tested strains were calculated. The letter A stands for biocontrol capacity without the test strains; the letter B represents biocontrol capacity of the test strains; the symbol “**” indicates that the P value of the difference between the data of B. cereus 0–9 and the mutants was extremely significant (P < 0.01)