Analysis of the Inoculation Method of Trichoderma Ear Rot and the Resistance of New Maize Varieties
Ear rot is a serious disease of maize.The ear rot caused by Trichoderma spp.is increasing year by year in China.The development and utilization of resistant cultivars is the most economical,safe,and effective meth-od for controlling ear rot.Over the past three years(2020-2022),four methods of resistance identification have been compared,including silk spraying,silk channel injection,kernel injection,and the two toothpicks method.The re-sults showed that the silk channel injection method had moderate disease intensity,which could make different vari-eties show different levels of resistance responses after artificial inoculation.Silk channel injection was a desired and easy-to-operate inoculation method,which was conducive to the natural expansion and infection of pathogens.During 2021-2022,2.6％,13.6％,26.0％,44.4％,and 13.4％of new maize varieties were highly resistant,resistant,moderately resistant,susceptible and highly susceptible to Trichoderma ear rot,respectively.
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