Screening Fungicides for Controlling Fusarium Head Blight of Winter Wheat  

作　　者：ze liu li zhao xianfang he jianlai wang 

机构地区：[1]crop research institute,anhui academy of agricultural sciences,Hefei 230031,China

出　　处：《Agricultural Science & Technology》2017年第12期2495-2502,共8页农业科学与技术（英文版）

基　　金：Supported by the Special Fund for Agro-Scientific Research of the Public Interest(201503112-12)

摘　　要：Chemical control of wheat Fusarium head blight(FHB) is emphasized when the genetic resistance in cultivars is insufficient in preventing the crop from disease damage or the crop is under high FHB epidemic pressure. Considering the accumulating resistance to carbendazim in FHB pathogens due to its repeatedly use, alternative fungicides with higher efficacy and safety need to be selected and recommended. In this study, ten fungicides were screened for their efficiencies of controlling FHB on winter wheat in Anhui Province, during 2015-2016 growing season. Fusarium infection, demonstrated both as disease incidence and severity, was positively correlated to the Fusarium-damaged kernels(FDKs) and deoxynivalenol(DON) content in the harvested grains and negatively correlated to the grain yield. Fungicides containing tebuconazole, e.g. phenamacril+tebuconazole, tebuconazole+thiram, prothioconazole+tebuconazole, and thiophanate-methyl+tebuconazole all showed control effects on FHB,especially when those fungicides were sprayed onto the spikes at early anthesis and then a second spray one week later.Phenamacril, though gave no obvious effects on decreasing FHB incidence and severity, performed equally in decreasing the FDKs and DON content to tebuconazole. Those fungicides could be recommended to control wheat FHB, and better to be used alternately in the purpose of avoiding accumulating resistance in the causal pathogens. Biocontrol agent validamycin A +Bacillus cereus endospores also achieved acceptable control efficiency, especially under situations that environmental and food-safety issues were concerned. Difenoconazole +polyoxin B and tetramycin failed to show any advantages in controlling the infection of FHB pathogens.Chemical control of wheat Fusarium head blight （FHB） is emphasized when the genetic resistance in cultivars is insuf- ficient in preventing the crop from disease damage or the crop is under high FHB epidemic pressure. Considering the accumu- lating resistance to carbendazim in FHB pathogens due to its repeatedly use, alternative fungicides with higher efficacy and safety need to be selected and recommended. In this study, ten fungicides were screened for their efficiencies of controlling FHB on winter wheat in Anhui Province, during 2015-2016 growing season. Fusarium infection, demonstrated both as disease incidence and severity, was positively correlated to the Fusarium-damaged kernels （FDKs） and deoxynivalenol （DON） content in the harvested grains and negatively correlated to the grain yield. Fungicides containing tebuconazole, e.g. phenamacril＋tebucona- zole, tebuconazole＋thiram, prothioconazole＋tebuconazole, and thiophanate-methyl＋tebuconazole all showed control effects on FHB, especially when those fungicides were sprayed onto the spikes at early anthesis and then a second spray one week later. Phenamacril, though gave no obvious effects on decreasing FHB incidence and severity, performed equally in decreasing the FDKs and DON content to tebuconazole. Those fungicides could be recommended to control wheat FHB, and better to be used alternately in the purpose of avoiding accumulating resistance in the causal pathogens. Biocontrol agent validamycin A＋Bacillus cereus endospores also achieved acceptable control efficiency, especially under situations that environmental and food-safety is- sues were concerned. Difenoconazole＋polyoxin B and tetramycin failed to show any advantages in controlling the infection of FHB pathogens.

关 键 词：Fusarium graminearum Triticum aestivum Fusarium-dameged kernels Deoxynivalenol(DON) Carbendazim resistance 

分 类 号：S435.121.45[农业科学—农业昆虫与害虫防治]