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.

The first group included 8 isolates causing apple ring rot and pear ring rot.

The apple ring rot is an serious fruit disease.

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.

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 provide reference for pear storage,pathogen of pear ring rot was separated and purified cultured,and pathogenicity of pathogen was test,taking Pyruspytifolia Nakai cv.