江苏省水稻恶苗病菌对咪鲜胺和氰烯菌酯的敏感性

对采自江苏省姜堰、靖江和常州3个地区的水稻恶苗病样品进行了病原菌的分离和鉴定,利用菌丝生长速率法测定了病原菌对咪鲜胺和氰烯菌酯的敏感性。结果表明:分离得到77株水稻恶苗病菌Fusarium fujikuroi;咪鲜胺对水稻恶苗病菌的EC50值在0.020~1.333μg/m L之间,分离到的菌株对咪鲜胺均表现为中抗和高抗,其中中抗菌株18株,占23.38%,高抗菌株59株,占76.62%,说明咪鲜胺高抗菌株已经成为江苏省的恶苗病菌优势群体。氰烯菌酯(JS399-19)对水稻恶苗病菌的EC50值在0.012~2.040μg/m L之间,菌株的敏感性频率近似正态分布,EC50均值为(0.684±0.265)μg/m L,建议将此值作为江苏省水稻恶苗病菌对氰烯菌酯的敏感性基线。

Sensitivity of Fusarium fujikuroi to prochloraz and JS399-19 in Jiangsu Province

Samples of rice bakanae disease were collected from Jiangyan, Jingjiang, Changzhou in Jiangsu Province. Seventy seven isolates of Fusarium fujikuroi were identified, and their sensitivity to prochloraz and JS399-19 were investigated using mycelium growth inhibition method. The results exhibited that the EC50 values of prochloraz to F. fujikuroi isolates were from 0.020 to 1.333 μg/mL. Among the 77 F. fujikuroi isolates, 18 isolates exhibited medium level resistance to prochloraz, with a frequency of 23.38%;while 59 isolates showed high level resistance, with a frequency of 76.62%. The resistant population of F. fujikuroi to prochloraz was dominant in Jiangsu Province. The EC50 values of JS399-19 to F. fujikuroi isolates were from 0.0124 to 2.040 μg/mL, and the sensitivity frequency of F. fujikuro isolates to JS399-19 exhibited a Gaussian distribution, with mean EC50 value (0.684±0.265) μg/mL, which could be considered as sensitivity baseline of F. fujikuro to JS399-19 in Jiangsu Province.