[Field test and lab experiment on control efficacy of the pathogen of opium poppy mildew].

Objective: To screen effectual fungicides for field control because of the seriousness of opium poppy mildew and importance of chemical control on plant diseases.

Method: Seven fungicides were screened in Lab experiment and field test during 1996-1997.

Result And Conclusion: All of them and their different dosages were effective to control conidia of Peronospora arborescens.

[Study on the pathogen and its biological characteristics of opium poppy downy mildew].

Objective: To study the pathogen of opium poppy downy mildew and its biological characteristic for further research on the disease.

Method: Development of the disease was observed systematically in the field. Germination rate of sporangium in different temperature, pH and nutrition was examined with suspending-drop method.