Preliminary Study on Effect of Maize Round Spot by a Biological Resistance Inducer

A home-made biological resistance inducer(BRI) induced successfully maize resistance to round spot caused by Cochliobolus carbonum though it could not inhibit the fungal conidial germination and mycelial growth.BRI induced the resistance and control effect with its concentration ranging from 10 to 100 μg/mL.One hour before inoculation of the pathogen,BRI was sprayed onto maize seedling and could induce the resistance and reduce the disease,and the resistance increased with the delay of pathogen inoculation.BRI controlled 77.46% of the disease when it was applied in 5 hours before the pathogen inoculation and its control effect gradually reduced when that in 6 hours.BRI controlled 60.95%-71.46% and 18.08% of the disease when the pathogens were inoculated with 1×103-5×104 spores/mL and 1×105 spores/mL,respectively.