Electric resistance in the bark of Chinese chestnut was measured with electric multimeter for the first time, and the relationship between the severity of stem diseases and the resistance value was studied.

Effect of exogenous nitric oxide donor on plasmalemma H~+—ATPase and antioxidative enzyme activities of pear infected by Pnysalosproa piricola Nose.;

Effect of exogenous NO donor on chlorophyll of pear leaves that are infected with pnysalosproa piricola nose and fluorescence parameters;

Effect of Sodium Selenite on Activities of APX,SOD,GPX and GR when Pear Leave are Infected with Physalospora Piricola Nose;

Physiological responses of pear leaves infected by Physalospora piricola Nose;

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.

A preliminary study on the ring spot of California Privet;

The apple ring spot is an important disease and happens often at the apples growth and storage period.

On account of the experiment and analysis of pathogenetic Poeomia suffruticosa Andr,ring spot of Poeomia suffruticosa Andr is a fungal disease by microscopic identification,and the pathogeny is pseudocercospora variicola.