Effect of azoxystrobin and kresoxim-methyl on rice blast and rice grain yield in China

文献类型： 外文期刊

第一作者： Chen, Y.

作者： Chen, Y.;Yang, X.;Zhang, A. -F.;Gao, T. -C.;Yuan, S. -K.;Li, Y. -F.;Yao, J.;Chen, Y.;Yang, X.;Zhang, A. -F.;Gao, T. -C.;Chen, Y.;Yang, X.;Zhang, A. -F.;Gao, T. -C.

作者机构：

关键词： azoxystrobin;baseline sensitivity;cross-resistance;kresoxim-methyl;Magnaporthe oryzae;rice blast

期刊名称：ANNALS OF APPLIED BIOLOGY （ 影响因子：2.75； 五年影响因子：2.942 ）

ISSN：

年卷期：

页码：

收录情况： SCI

摘要： Sensitivity to azoxystrobin and kresoxim-methyl of 80 single-spore isolates of Magnaporthe oryzae was determined. The EC50 values for azoxystrobin and kresoxim-methyl in inhibiting mycelial growth of the 80 M. oryzae isolates were 0.006-0.056 and 0.024-0.287 mu g mL(-1), respectively. The EC50 values for azoxystrobin and kresoxim-methyl in inhibiting conidial germination of the M. oryzae populations were 0.004-0.051 and 0.012-0.105 mu g mL(-1), respectively. There was significant difference in sensitivity to azoxystrobin or kresoxim-methyl between the tested isolates representing differential sensitivity to carbendazim (MBC) and kitazin P (IBP); however, there was no correlation between this difference in sensitivity to azoxystrobin or kresoxim-methyl and sensitivity to MBC or IBP, indicating that there was no cross-resistance between azoxystrobin or kresoxim-methyl and MBC or IBP. In the protective and curative experiments, kresoxim-methyl exhibited higher protective and curative activity than azoxystrobin when applied at 150 and 250 mu g mL(-1) accordingly, while azoxystrobin exhibited stronger inhibitory activity against M. oryzae isolates than that of kresoxim-methyl in the in vitro test. The results of field experiments also suggested that both azoxystrobin and kresoxim-methyl at 187.5g.a.i. ha(-1) gave over 73% control efficacy in both sites, exhibiting excellent activity against rice blast. Taken together, azoxystrobin and kresoxim-methyl could be a good substitute for MBC or IBP for controlling rice blast in China, but should be carefully used as they were both at-risk.

分类号： Q1-0

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