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制种玉米亲本自交系一般生长势较弱,抗病虫害能力也相对较弱。病虫害主要发生在三个阶段,一是幼苗期土蚕等地下害虫的危害,造成缺苗断行;二是拔节期至孕穗期粘虫螟虫等危害,造成叶片残缺、茎秆断枯;三是乳熟期纹枯病、大小斑病危害,造成下部叶片干枯,甚至苞对受害,果穗畸形。针对病虫害的发生规律,玉米制种区采用呋喃丹防治地下害虫和粘虫螟虫,效果较好。定期在幼苗期、拔节期施用呋喃丹,在乳熟期施用井冈霉素,可彻底防治玉米整个生育期间的病虫危害。按目前市售价计算,三次用药费用共5～6元,费省效宏。三次用药方法如下: 1.幼苗期:即直播玉米在出苗后,育苗玉米在移栽后,每亩用呋喃丹3%颗粒剂0.5公斤。呋喃丹
Seed production of maize inbred lines generally weak growth potential, pest resistance capacity is relatively weak. Pests and diseases occur mainly in three stages, one is the damage of underground pests such as soil silkworm seedlings, resulting in lack of seedlings broken line; second jointing to booting post-mortem pest insects and other hazards, resulting in leaves incomplete, dry stem; third milk Sheath blight, the size of the plague hazards, causing the lower leaves dry, and even the bracts on the victims, ear malformations. For the occurrence of pests and diseases, corn germplasm areas using carbofuran to control underground pests and armyworms borers, the effect is better. Regular application of carbofuran at seedling stage and jointing stage and application of validamycin at milk stage can completely prevent and control the pests and diseases of corn during the whole growth period. Calculated at the current market price, the cost of three doses of a total of 5 to 6 yuan, save provincial macro-efficiency. Three methods of treatment are as follows: 1 seedling stage: that is, direct seeding corn after emergence, nursery maize after transplanting, carbofuran 3% granules 0.5 kg. Carbofuran