摘要
【目的】研究3种三唑类杀菌剂对映体对3种镰刀菌Fusarium spp.的杀菌活性。【方法】采用生长速率法,测定戊唑醇、腈菌唑和苯醚甲环唑各对映体对串珠镰刀菌F.moniliforme、再育镰刀菌F.proliferatum和禾谷镰刀菌F.graminearum的杀菌活性,并分析各对映体EC50值。【结果】3种三唑类手性杀菌剂对映体对供试串珠镰刀菌、再育镰刀菌和禾谷镰刀菌菌株的杀菌活性存在差异,(-)-戊唑醇>(+)-戊唑醇,二者杀菌活性相差32~208倍;(+)-腈菌唑>(-)-腈菌唑,二者杀菌活性相差1.4~6.4倍;在苯醚甲环唑对映体之间,(2R,4R)-苯醚甲环唑活性最高,4个对映体之间的杀菌活性相差3.7~15.5倍。【结论】3种三唑类手性杀菌剂对映体对串珠镰刀菌、再育镰刀菌和禾谷镰刀菌的杀菌活性均表现出选择性差异,(-)-戊唑醇、(+)-腈菌唑和(2R,4R)-苯醚甲环唑表现出较高的杀菌活性。本研究结果可为筛选活性高的杀菌剂、减少农药使用提供理论参考。
【Objective】To study the activities of enantiomers of three triazole fungicides against Fusarium spp..【Method】Three chiral fungicides included tebuconazole, myclobutanil and difenoconazole. The activities of fungicide enantiomers against F. moniliforme, F. proliferatum and F. graminearum were assessed by mycelial growth rate method, respectively. The EC50 values of enantiomers were analyzed. 【Result】The activities of different enantiomers against three kinds of Fusarium spp. were different. The activity of(-)-tebuconazole was higher than(+)-tebuconazole, and the EC50 difference of two enantiomers was 32-208 times. The inhibitory activity of(+)-myclobutanil was higher than(-)-myclobutanil, and the EC50 difference of two enantiomers was 1.4-6.4 times.(2R,4R)-difenoconazole showed the maximum activity among four enantiomers of difenoconazole, and the EC50 difference of four enantiomers was 3.7-15.5 times. 【Conclusion】For Fusarium spp., the activities of three fungicides show selective difference.(-)-tebuconazole,(+)-myclobutanil and(2R,4R)-difenoconazole show higher activities. These results might contribute to screening higher active fungicides and reducing the use of pesticides.
出处
《华南农业大学学报》
CAS
CSCD
北大核心
2017年第5期56-60,共5页
Journal of South China Agricultural University
基金
国家自然科学基金(31371959)
关键词
手性农药
三唑类杀菌剂
对映体
镰刀菌
杀菌活性
立体选择性
chiral pesticide
triazole fungicide
enantiomer
Fusarium spp.
fungicidal activity
enantioselective