Study on the Stage of Latent Infection and Regularity of Development of the Pear Ring Rot Disease after Postharvest

In order to make sure the latent infection and rotting stage of the ring rot disease caused by Physalospora piricola,the fruit was bagged and un-bagged at different after blossom,and the smearing and inoculation with Physalospora piricola spore were also conducted regularly during the growth of fruit.The results showed that the main infection time of P.piricola to the pear fruit was from 50 d to 70 d after blossom,the infection was also occurred after 110 d of blossom,but it was not easy to be infected within 50 d after blossom.The pathogen was easily infected the fruit through tiny wound.The rotting fruit was mainly took place at the stage of 40～60 d after harvest at the step-cooling storage condition.The fruit inoculated with spore solution at growth stage was more easily decayed than the control.