一、用小灰防治稻热病蔓延的实例河北省宁河一带的稻田,在七月底局部发生了严重的叶稻热病。一区皇姑庄互助组中有五——六亩被害后,稻叶子就跟让火烤干了的掃帚一样死掉了。其他如董庄子合作农庄、小百庄互助组以及水稻丰 First, the use of small gray to prevent the spread of rice fever in Ninghe, Hebei Province, the area around the rice fields, at the end of July, a serious partial occurrence of leaf blight. In a district Huanggu Zhuang mutual aid group of five - six acres of the victims, the leaves of rice just let the fire roasted broom died. Other such as Dong Zhuangzi cooperative farms, small Bai Zhuang mutual aid group and rice abundance