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[Field test and lab experiment on control efficacy of the pathogen of opium poppy mildew]
Zhao-xiang Chai1, Jin-hua Li, Min-quan Li
1Plant Protection Department of Gansu Agricultural University, Lanzhou 730070, Gansu, China.
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.
