Control efficacy of cyazofamid·azoxystrobin 24％SC against potato black scurf
[Aims]The aim of this study is to find more fungicides for effective control of potato black scurf.[Methods]The laboratory activity and field efficacy of cyazofamid·azoxystrobin 24％SC was determined by mycelial growth rate method,pot test,disease nursery experiments and field trials.[Results]The EC50 value of cyazofamid·azoxystrobin 24％SC was 0.33 mg/L,which was lower than that of difenoconazole·azoxystrobin 32.5％SC and thifluzamide 24％SC.Among the trials of the three different fungicides,treatment of 150 mL/ha of cyazofamid·azoxystrobin 24％SC showed the best efficacy against potato stem base and tuber black scurf,with a field control effect rate reaching up to 71.15％.[Conclusions]Ditch application of cyazofamid·azoxystrobin 24％SC demonstrated excellent control against potato black scurf,with a recommended dosage ranging from 150 to 230 mL/ha.
potato black scurfcyazofamid·azoxystrobin 24％SCbioactivitycontrol efficacy
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