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花卉苗木枯萎了怎么办
花卉苗木枯萎了怎么办
What about the withered flowers and seedlings?
花卉苗木立枯病是由真菌侵染而引起的一种苗期病害,病菌多从表层土侵染幼苗根部和茎基部,受害部下陷缢缩,呈黑褐色。如幼苗刚出土时,表现病状为猝倒;如幼苗组织已木质化,则表现为立枯。潮湿时病部长白色菌丝体或粉红色霉层,严重时造成病苗萎蔫死亡。
Flower seedling blight is a kind of seedling disease caused by fungal infection. The fungi mostly infect the root and stem base of seedlings from the surface soil. The damaged part is sunken and constricted, showing a black-brown color. When the seedlings are newly unearthed, the disease symptoms are sudden collapse; if the seedling tissues have been lignified, the disease symptoms are standing dead. The white mycelium or pink mildew of the disease minister in wet season causes the disease seedling wilting and death in severe season.
防治方法:
Prevention and treatment methods:
(1)苗床用土和盆栽用土,都必须用无病新土或消毒土。土壤消毒的方法是每平方米用40%福尔马林50毫升对水8-12.5千克,浇灌土面,用塑料薄膜覆盖4-5天,揭除覆盖物,经7-10天后播种;或在栽植、播种前条施70%的五氯硝基苯粉剂与80%代森锌的等量混合物,每平方米地面用8-10克。
(1) Both seedbed and potted soils must be treated with disease-free new soils or disinfectant soils. The method of soil disinfection is to use 40% formalin 50 ml to water 8-12.5 kg per square metre, water the soil surface, cover it with plastic film for 4-5 days, remove the mulch and sow it after 7-10 days, or apply 70% pentachloronitrobenzene powder and 80% zinc equivalent mixture before planting and sowing, 8-10 grams per square metre of ground.
(2)播种或种植前灌水,保持土中水分充足,在幼苗出土后20天内,严格控制灌水。
(2) Irrigation before sowing or planting to keep sufficient water in soil, and strictly control irrigation within 20 days after seedling emergence.
(3)幼苗发病初期,用70%甲基托布津700-800倍液浇灌,可起到灭菌保苗的作用。
(3) In the early stage of seedling onset, 70% methyltoprazine 700-800 times solution can be used to sterilize and protect seedlings.

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