水稻红叶病用什么药

水稻红叶病用什么药用什么药治
2025-02-06 19:23:11
推荐回答(5个)
回答1:

疑似水稻生理缺钾。缺钾的稻株矮小、心叶窄挺、分蘖减少,稻株发病表现症状是从下部老叶尖端开始,逐步向叶片基部扩展;叶片由叶尖开始形成条状褐色斑点,整株叶片自下叶逐渐向上叶蔓延,只有少数新叶还保持绿色,远看像火烧一样。抽穗困难,子粒干瘪、皱缩,节间短,易倒伏。处理办法:应即排水,喷施1%氯化钾或硫酸钾水溶液。防范:科学灌水,干干湿湿、适时烤田;增施钾肥、后期喷施磷酸二氢钾。

回答2:

整个叶子发红是缺磷,补磷酸二氢钾。
红色小点可能是叶锈病,属担子菌亚门
黑褐色斑点是胡麻叶斑病,属半知菌亚门,
两种病都可以用苯醚甲环唑+嘧菌酯治好。

回答3:

防治水稻稻曲病的药有多种,但一定要防治及时,特别今年水稻抽穗期间雨水大,温度低,该病发生偏重。防治时间要求第一次用药在水稻最后一片叶叶枕平时,第二次过7天左右水稻破口时防治。用药可以用己唑醇、井岗霉素等。

回答4:

水稻水红病又称水稻东格鲁病毒病,受害植株矮缩和叶片变色,生长衰退,叶片颜色为橙色至黄色。籼稻染病多为橙色或稍带红色,又叫红叶病。粳稻染病多呈黄色。嫩叶上现斑驳,老叶上现锈色斑点。东格鲁系菲律宾土语,表示衰退的意思。

防治方法:

(1)选用抗(耐)病品种如国际26等。

(2)要成片种植,防止叶蝉在早、晚稻和不同熟性品种上传毒。早稻早收,避免虫源迁入晚稻。收割时要背向晚稻。

(3)加强管理,促进稻苗早发,提高抗病能力。

(4)推广化学除草,消灭看麦娘等杂草,压低越冬虫源。

(5)治虫防病。及时防治在稻田繁殖的第一代若虫,并要抓住黑尾叶蝉迁飞双季晚稻秧田和本田的高峰期,把虫源消灭在传毒之前。可选用25%噻嗪酮可湿性粉剂,每667m225g或35%速虱净乳油100ml、25%速灭威可湿性粉剂100g,对水50L喷洒,隔3-5天1次,连防1-3次。

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扩展资料:

改善方法:播种不宜太密,及时间苗,使通风透光,促进苗木生长健壮,氮肥不宜偏多,注意氮、磷,钾肥的合理配合。及时清除病菌,冬季深耕,把病枝叶埋入土中,重病圃地避免连作。

传播发病:

病毒由二小点叶蝉(Nephotettiximpictceps)、二点黑尾叶蝉、黑尾叶蝉等,以半持久方式传播,接触或汁液摩擦不能传播,二小点叶蝉最短获毒或接毒时间分别为30分钟和15分钟。

接毒后经6~9天潜育即显症。该病毒在虫体内循回期不明显,传毒时间为5~7天,7天后不再传毒。二小点叶蝉传毒率很高,其他叶蝉传毒率不高,有的不传毒,品种间抗病性有差异。

参考资料:/baike.baidu.com/item/%E6%B0%B4%E7%A8%BB%E4%B8%9C%E6%A0%BC%E9%B2%81%E7%97%85%E6%AF%92%E7%97%85/6603588"target="_blank"title="水稻东格鲁病毒病-百度百科">水稻东格鲁病毒病-百度百科

回答5:

现在水稻穗都出来了叶尖红了用什么药

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