Effects of infection time and moisture on development of ear blight and deoxynivalenol production by Fusarium spp. in wheat

被引:87
作者
Lacey, J
Bateman, GL [1 ]
Mirocha, CJ
机构
[1] IARC Rothamsted, Harpenden AL5 2JQ, Herts, England
[2] Univ Minnesota, Dept Plant Pathol, St Paul, MN 55108 USA
关键词
wheat; ear blight; Fusarium spp; Fusarium culmorum; mycotoxins; deoxynivalenol;
D O I
10.1111/j.1744-7348.1999.tb05265.x
中图分类号
S [农业科学];
学科分类号
09 ;
摘要
Wheat ears were inoculated with conidia of Fusarium spp. at different growth stages between ear emergence and harvest and moist conditions were maintained for up to 7 days subsequently by mist irrigation. Of the fungi tested (Fusarium culmorum, F. avenaceum, F. tricinctum, F. sporotrichioides and Microdochium nivale), only F. culmorum produced ear blight symptoms and grain samples were found subsequently to contain deoxynivalenol. Most ear infection and deoxynivalenol formation occurred following inoculation at about mid-anthesis. Small amounts of deoxynivalenol were formed and some F. culmorum was isolated even in the absence of ear blight symptoms. An overnight wet period was sufficient to initiate infection and deoxynivalenol formation but both were increased by extending the wet period up to at least 3 days. Recovery of Fusarium spp, from harvested grain was usually possible whether or not symptoms developed. F. culmorum usually persisted and often increased to moderately high levels after storage for 7 wk in a range of moisture conditions.
引用
收藏
页码:277 / 283
页数:7
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