水稻缩苗病在渤海地区、滨海盐土地上历年来都有发生,特别在新开荒地的重盐渍土上种水稻,发生更为普遍。缩苗病一般从插秧后10—20天开始发生(秧田也有发生),整个生育期都有病症,不过有两次表现特别突出。从日期上来看,第一次约在6月20—25日左右,也就是多在分蘖始期开始发生。第二次缩苗严重期多在7月底8月初(插秧期在6月初),正是水稻 Rice seedling disease in the Bohai Sea area, coastal salt land have occurred over the years, especially in newly reclaimed land of heavy saline soil, the more common occurrence. The seedling disease generally begins 10-20 days after transplanting (seedling has also occurred), the entire growth period has a condition, but twice the performance is particularly prominent. From the date point of view, the first about about 20-25 June, that is, more in the beginning of tillering occurs. The second serious reduction in seedling more at the end of July early August (transplanting period in early June), it is rice