摘要
水稻纹枯病生育前期与乳熟期病情的关联性,晚稻较早稻显著。严重影响减产的发病时期,晚稻也较早稻早.据此,提出早稻的始稳期和晚稻的孕穗前期分别作为稻纹枯病防治一次的适期;并以分蘖末期丛发病率10％以上作为要进行晚稻纹枯病防治一次的指标,并估算允许经济阈值,早稻为3.5％,晚稻为4.0％.
Data from 4-year experiments indicated that the relationship between the disease severity of sheath blight
at early growth stage and that at milky maturity stage in early rice was more significant than that in late rice.
The time of disease development which affected yield seriously in late rice came earlier than that in early rice.
Thus, the best period for one-time spray was heading stage in early rice, and early booting stage in late rice.
The study suggested that the action thresholds of hill incidence of disease was over 10％. In addition, it was
estimated for economic injury level of early rice by 3.5％, and that of late rice by 4.0％.
出处
《科技通报》
1993年第6期406-410,共5页
Bulletin of Science and Technology
关键词
纹枯病
防治
水稻
rice sheath blight
occurence epidemic
control threshold
