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当前,南方早稻大部处于抽穗灌浆期,江南、西南、长江中下游稻区单季稻处于返青分蘖期,分别正值穗颈瘟和稻叶瘟的感病敏感生育期。受前期南方稻区阴雨寡照天数偏多影响,稻瘟病田间始见期偏早、发病较重,明显早于和重于上年。截至6月14日,全国稻叶瘟、穗颈瘟累计发病面积分别为747.3万亩和19.2万亩,分别较上年同期增加28.8%和58.7%。根据全国农作物病虫害测报网区域站调查监测结果,结合水稻品种抗性、天气情况等因素综合分析,预计下阶段稻叶瘟在西南东部和北部、江南和长江中下游单季稻区发病面积将迅速扩增,穗颈瘟在南方早稻区局部偏重流行的风险进一步增大。
At present, most of the early rice in the south is in the heading stage, and single-cropping rice in the south, southwest and middle and lower reaches of the Yangtze River is in the turning-back tillering stage, which is positive for susceptible growth stage of panicle blast and rice leaf blast. Affected by the cloudy and poorly litter of southern rice area in the early days, the onset of blast in the field was earlier and the incidence was heavier, significantly earlier and heavier than in the previous year. As of June 14, the cumulative incidence of rice leaf blast and panicle blast in the country were respectively 747.3 million mu and 192,000 mu, up 28.8% and 58.7% over the same period of last year respectively. According to the survey and monitoring results of the regional stations for pest and disease detection of the country and the comprehensive analysis of the resistance of rice varieties and weather conditions, it is estimated that the incidence of rice leaf plague will increase rapidly in single-crop rice areas in the east and northwestern part of southwest China and the middle and lower reaches of the Yangtze River in the next stage , Panicle blast in the southern rice area partial prevalent epidemic risks further increased.