推荐回答(5个)
兰花叶尖干枯,就要为其遮蔽强光,避免它被暴晒,如果土壤有积水产生的话,它的叶尖也会干枯,此时需要及时排水,还有可能是湿度过低导致的,那么要为其喷水增加空气湿度,注意病害也会使它叶尖干枯,这种现象要用药物喷洒治疗。
盆栽兰花叶尖干枯甚至整叶枯萎,主要原因是兰花炭疽病和圆斑病。该病在梅雨季节或夏秋之交高温多雨时大量发生,可在易发病期喷洒50%多菌灵1000倍液或50%克菌丹500倍液,10天1次,连喷3~4次作预防。家庭可购买小包装杀菌农药。
兰花遭受冻害或晚霜危害时,也易形成叶尖干枯或变色。因此,冬季气温在0℃以下的地区,入冬前要把兰花移置室内通风向阳处。春天移置室外时,要注意避免晚霜危害。传统经验“春不风、夏不日、秋不干、冬不湿”对防止兰叶干枯大有好处。
对于叶尖已干枯的兰叶,可用剪刀(最好经酒精消毒)按“Λ”形在干枯部分以下10毫米处剪去,以保持满盆绿色,如剪后再喷上述杀菌剂则更好。
兰花叶尖干枯一是由于兰花炭疽病和圆斑病所造成。这种病在梅雨季节或夏秋之交高温多雨时大量发生。解决方法是在易发病期喷洒50%多菌灵1000倍液或50%克菌丹500倍液,10天1次,连喷3-4次。
兰花遭受冻害或晚霜危害时也容易形成叶尖干枯或变色。因此冬季气温在0℃以下的地区,入冬前要把兰花移到室内通风、有阳光处养护。春天移出室外时要注意避免晚霜危害。传统经验“春不风、夏不日、秋不干、冬不湿”对于防止兰叶干枯大有好处。
对于已经发生叶尖干枯的兰花叶片,若情况不太严重可采用人工剪除的办法,用剪刀(最好经酒精消毒)按“∧”形在干枯部分以下10毫米左右处剪去,这样仍可保持满盆绿色,若修剪后再喷上杀菌剂则更好。
“春不风、夏不日、秋不干、冬不湿”是指春天不要太早移到室外,避免大风侵害;夏天要适当遮荫,防烈日暴晒;秋天要经常浇水,防止干旱;冬季盆土不能太湿,防止冰冻和烂根。
兰株叶片焦尖病,多数是由于水渍、日灼、气闷、冻伤、缺素、肥、药渍伤和生理性、侵染性烂根所致,生理性的叶尖枯焦部分,色泽—致,没有界色点斑痕,其背面也无浮门的异色粒状或丝状物释。发现兰叶焦尖后,应光认真观察、分析致病原因,排除生理病害的致因后,再从侵染性病害来辨认。 1.铁锈病 铁锈病的病原为驼孢锈菌(Hemilleia) 铁锈病,俗称沙斑病,是危害兰株叶端背的主要病害,为世界性兰花病害之?。病原菌入侵后,叶端背表层鼓起许多芝麻粒大小的铁褐色凸状物。数日后,凸状物破裂,露山锈色粉状物,即病菌孢子。孢子随风飘扬,重复侵染兰株。由于早期病斑细小,色彩不明显,因此在叶面上不易觉察到。待到能发现病斑时,其病菌孢子已扩散了。这就给病情测报、防治带来了很大的困难。其防治办法是经常检查叶端背,喷药防病时注意喷及叫‘端背。治疗本病的对症农药是:亿力1000倍液,粉锈宁,“大牛45"500倍液,世高 6000倍液,万佳生600倍液,敌力康1 000倍液等。预防可喷施代森锰锌500倍液。 2.褐锈病 褐锈病的病原为夏孢锈菌(VredoJaponica)。该病菌从叶背气孔入侵,最初在叶面边缘出现淡褐色至橙黄褐色的细小斑点,然后逐渐扩大,蔓延成片,直到叶片枯落。病斑连成片时,斑色转黑,斑缘常有黄晕。该病常在寒流袭来的早冬和气温刚回升的仲春,基质过分潮湿I时发生。 防治该病的显效药剂是施保功1 500倍液,兰威宝800倍液和敌力康1000倍液也有较好的防治效果。代森锰锌的500倍液对陔病有预防作用。 3.枯尖病 枯尖病的病原为葡萄孢真菌(Botrytis spp)。. 枯尖病病菌侵染叶端时,叶端出现圆形或不规则形酌褐色斑。—旦病斑密连成片,叶端便告枯死,病斑上即长出黑色孢子囊。该病的最大特点是,病斑与健康组织的界限非常整齐。 该病的对症显效药剂是,施保功1 500倍液和敌力康1 000倍液,50%苯菌灵800倍液。
兰花叶尖干枯是我们在养殖兰花当中最常见的问题,兰花喜欢温暖湿润的环境,我们所处的环境常常是气温不稳定,湿度或干或湿,想把兰花养封尖还是有难度的。
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