Study on preparation and safety of 24.6%thiamethoxam·metco-nazole·azoxystrobin flowable concentrate for seed treatment
Flowable concentrate for seed treatment can control pests and diseases from the source,reduce the cost of control,and reduce environmental pollution.In order to obtain a flowable concentrate for seed treatment(FS)that could effectively control the main pests and diseases of wheat and rice,the wetting dispersant,film-forming agent and thickener were screened,and the optimized formula of 24.6%thiamethoxam·metconazole·azoxystrobin flowable concentrate for seed treatment(FS)was determined,and its safety and biological activity were tested.The results showed that the optimized formula of 24.6%thiamethoxam·metconazole·azoxystrobin FS was as follows:thiamethoxam 18.2%,metconazole 3.2%,azoxystrobin 3.2%,polycarboxylate dispersant GEROPON DA13491 2%,polyarylether sulfate ammonium dispersant FD530 2%,xanthan gum 0.3%,magnesium aluminum silicate 0.5%,acrylic emulsion n8 4%,8#red 8%,benzoic acid 0.2%,ethylene glycol 4%,silicone defoamer BG08 0.5%,deionized water to make up to 100%.The particle size(D90)of the flowable concentrate for seed treatment was 1.72 μm,the film forming property was good,the shedding rate was less than 5%,and all the quality indices met the enterprise standard of the flowable concentrate for seed treatment.In the germination experiment,the germination rates of wheat and rice seeds after coating reached 95.67%and 88.67%,respectively.In the pot experiment,the emergence rates of wheat and rice after coating were 85.33%and 91.33%,respectively,indicating that the prepared flowable concentrate for seed treatment was safe for wheat and rice seed.Under this dosage,the relative control effects of 30 and 90 d after seedling on aphids were 32.82%and 93.51%,respectively,and the relative control effects on wheat sharp eyespot were 70.50%and 34.63%,respectively.The relative control effect on rice planthopper reached 21.44%and 26.78%at 30 and 60 d after emergence,and the relative control effect on rice blast reached 54.99%and 67.06%,indicating that the prepared flowable concentrate for seed treatment could control the above wheat and rice diseases and insect pests.
thiamethoxammetconazoleazoxystrobinflowable concentrate for seed treatmentformula
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