水稻本田的主要病害有稻瘟病、纹枯病、稻曲病等,其表现症状和防治方法如下: 1.稻瘟病发病后一般减产 10—20%,严重时颗粒无收,是吉林省水稻生产上的毁灭性病害。根据发病时期和部位,可分为苗瘟、叶瘟、节瘟、稻颈瘟和粒瘟,以穗颈瘟对产量影响最大。病症:①叶瘟。分蘖盛期发病较重,病斑有4种类型。急性型: 叶片产生暗绿色水渍状近圆形病斑,背面见大量灰色霉层,此型出现是稻瘟病流行的预兆。慢性型: 病斑梭形,两端常有褐色坏死线, 病斑中央灰白色,边缘褐色,外围 Rice Honda’s main diseases are rice blast, sheath blight, rice false smut, its symptoms and control methods are as follows: 1. After the onset of blast generally reduce the production of 10-20%, serious crop failure, Jilin Province is rice production On the devastating disease. According to the incidence of disease and parts, can be divided into seedling blast, leaf blast, section blast, rice neck blast and grain blast to panicle blast on yield the most. Illness: ① leaf blast. The incidence of severe tillering period, there are 4 types of lesions. Acute type: leaves produce dark green water stains near-circular lesions, see the back of a large number of gray mold layer, this type is the blast omen premonitory. Chronic type: fusiform spindle, often brown necrosis at both ends of the line, the lesion central gray, brown edge, periphery