[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. Among them, 72.2% propamocarb of 1203 and 902.5 ppm were the most effective both in Lab experiment and field test with efficacy 79.91% and 79.33% respectively in field test, and the efficacy of other fungicides was over 50%. Seven fungicides tested can be used to control nonsystematic symptom of opium poppy mildew.