Suspension concentrate for seed treatments containing pyraclostrobin and their control effect against maize stalk rot
[Aims]The aims of this study is to verify the best formula of pyraclostrobin·fludioxonil·metalaxyl-M 8.5％suspension concentrate for seed treatment(FS)and pyraclostrobin·metalaxyl-M 12％FS,and develop the highly efficient and low toxic seed coating agent used for controlling maize stalk rot.[Methods]6 Formulations of pyraclostrobin·fludioxonil·metalaxyl-M 8.5％FS and 6 formulations of pyraclostrobin·metalaxyl-M 12％FS were developed with the method of wet milling.The optimum formula was determined by testing the properties and quality of the seed coating agent,and the safety of the seed coating agent was tested in the laboratory and the control efficacy against maize stalk rot in the field was verified.[Results]The best formula of pyraclostrobin·fludioxonil-metalaxyl-M 8.5％FS was as follows:pyraclostrobin 5％,metalaxyl-M 1％,fludioxonil 2.5％,YUS-FS3000 5％,YUS-DF1011.5％,BX 0.5％,ethylene glycol 4％,xanthan gum 0.4％,defoamer 0.1％,8％PVA1788 5％,warning color 1％,water 74％.The best formulation of pyraclostrobin·metalaxyl-M 12％FS was as follows:pyraclostrobin 10％,metalaxyl-M 2％,YUS-FS3000 5％,YUS-DF10 2％,ethylene glycol 4％,xanthan gum 0.3％,magnesium and aluminum silicate 1％,defoamant 0.1％,8％PVA1788 5％,warning color 1％,water 69.6％.The two formulations were safe for maize growth,and their field control efficiency against maize stalk rot was more than 80％.[Conclusions]Pyraclostrobin· fludioxonil·metalaxyl-M 8.5％FS and pyraclostrobin·metalaxyl-M 12％FS developed in this study have significant control against maize stalk rot,laying a foundation for further field control study of maize stalk rot.
pyraclostrobinstalk rotmaizesuspension concentrate for seed treatmentformula
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