Field control effects of 5 fungicides on rice blast and their impact on rice yield
[Aims]This study aims to select the best fungicide with obvious effect on controlling rice blast and increasing yield,and to provide scientific basis for the prevention and control of rice diseases.[Methods]Using the method of field efficacy trial,variance analysis was conducted on 5 fungicides commonly used to control rice blast,and then the field control effects of the five fungicides were evaluated by cluster analysis.[Results]There was no phytotoxicity to rice after application,and all of the five fungicides could inhibit the occurrence of rice blast and increase the yield.Among them,trifloxystrobin·tricyclazole 35％SC at 1050 g/ha had the best control effect(91.4％),and Bacillus subtilis 20 billion spores/mL OD with the concentration of 1500 mL/ha increased the yield most significantly(18.74％).Cluster analysis divided 20 treatments of 5 fungicides into 3 categories according to the comprehensive effect,and 6 treatments with the best comprehensive effect were selected.[Conclusions]The treatments of trifloxystrobin·tricyclazole 35％SC at 1050 g/ha and Bacillus subtilis 20 billion spores/mL OD at 1500 mL/ha have the best control effect on rice blast.
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