葡萄裂果的原因及防治
葡萄裂果的原因?及防治提交
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葡萄裂果是一种生理性的病害。葡萄生理性裂果病在葡萄果实接近采收期间,常有裂果发生,降低品质,造成减产甚至绝收,影响经济效益。裂果的主要原因:一是缺钙。钙,是葡萄需要的主要元素之一,它主要以果钙胶的形态存在与细胞壁中,可使多糖类沉积,保持细胞壁的强固性。葡萄缺钙,细胞壁薄而脆弱,易造成葡萄裂果;二是土壤中含水不匀。一些地区春季干旱,土壤含水量低,此时正是葡萄果实一次膨大期,限制生长。葡萄生长后期,突然浇大水或天降大雨,使土壤中含水量突然上升。过分的水分,通过穗抽到达果粒,这样,果实靠近穗柄的细胞器分裂和生理活动加快,而靠近果皮的细胞活动比较缓慢,果实膨压增大,致使果粒纵向裂开。在浆果成熟期,若浇大水或遇大雨,暴雨,裂果最为严重;三是果粒相靠过紧。在葡萄成熟期,浆果二次膨大,果粒靠的太紧相互挤压过重而裂开;四是与白粉病,炭疽病危害有关。了解了葡萄裂果的原因,预防裂果的措施也就容易解决了:一是要对缺钙的地块补钙肥。现在全国许多地方正在推广测土配方施肥,对测得土壤缺钙的地块,施入钙肥,不仅防葡萄裂果,而且还能提升葡萄糖度。也可以叶面追肥。二是保持土壤含水量相对稳定,天气干旱时,对葡萄园浇小水(河南,安徽一带也叫跑马水),勤浇水。达到暴雨之前,要将葡萄园中拦水的土坝提前掘开,以防存水,也可以在葡萄近成熟时,行间盖上地膜,即可防旱,也可排涝,还可防止病菌繁殖。三是疏果。对果粒生长紧密的葡萄品种,在花前整穗,花后在果粒近黄豆大时疏果,也可在花前7-10天,对果穗喷施,以拉长果梗,使果粒松散不挤。四是搞好防病治病,以防为主,葡萄各种病害在不同的地域,因独特的气候条件,都有一定的发病规律,要和注意观察,积累,在某种病害高发期前,先喷保护性农药,加以预防,见病初发,立即对症用药,及时治疗。 郑州恒邦农业科技有限公司
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