稻瘟病是危害杂交稻制种的主要病害之一,制种区内因稻瘟病危害而造成减产甚至失收的事件时有发生,故必须引起我们的高度重视,在从事杂交稻制种技术指导时,需要针对制种田稻瘟病发生的特点进行综合防治,才能最终达到制种高产这一目标。 1.杂交稻制种田稻瘟病发生特点杂交稻制种田是由两种生理特性不一样的亲本组成,主要农艺管理措施也与大田水稻生产有所不同,因此,制种田稻瘟病发生及危害与其它水稻田相比较,也不尽相同,具有以下4个明显特点。 1.l发生时间早:制种田移栽密度普遍较大,施肥水平也较高,苗架厚而叶色浓绿,加之连片种植,对 Rice blast is one of the major diseases which endanger the hybrid rice seed production. The occurrence of cuttings or even loss due to the damage caused by blast in the seed production area must occur. Therefore, we must attach great importance to it. When conducting technical guidance on hybrid rice seed production, , It is necessary to carry out comprehensive prevention and control in response to the characteristics of the system of rice blasting in order to finally achieve the goal of high seed production. Characteristics of hybrid rice farming rice blast hybrid rice farming is composed of two different physiological characteristics of parents, the main agronomic management practices and field rice production is different, therefore, the system of rice blast and harm and other Paddy fields are also different, with the following four distinct features. 1.l occurred earlier: the system of transplanting density is generally larger, higher fertilization levels, seedling thick leaves dark green, combined with contiguous planting, the