水稻褐变穗室内化学药剂筛选及毒力测定

Study on the Indoor Chemical Fungicide Filtration and Virulence Test of Rice Browning Ear

为明确化学药剂对水稻褐变穗病原菌的抑制作用效果,采用菌丝生长速率法,从12种化学药剂中筛选出2种对水稻褐变穗病原菌有较好抑制作用的化学药剂咪鲜胺和异菌脲,毒力回归方程为y=0.887 24x+4.362 17、y=0.745 58x+4.429 5,相关系数(r)为0.985 19、0.986 89,EC50为5.24mg·kg^(-1)、5.82mg·L^(-1),经F测验均达显著水平。异菌脲是内吸性、治疗性杀菌剂,建议异菌脲进行下一步田间药效试验。

In order to clarify inhibitory effect of chemical fungicides,using mycelium growth rate method,two chemical fungicides,namely Prochloraz and Rovral that inhibit mycelia growth of the pathogen of rice browning ear better were filtrated from twelve chemical fungicides.Toxicity regression equations of Prochloraz and Rovral were y=0.887 24x＋4.362 17 and y=0.745 58x＋4.429 5,rare were 0.985 19 and 0.986 89,EC50 were 5.24mg·kg^-1 and 5.82mg·L^-1,Ftest results showed that toxicity regression equations were in prominence leve.Rovral was systemic and curative fungicide to develop the field efficacy trials.