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      防治甜菜褐斑病要抓好時機

      時間: 2019-08-12      來源:     



      甜菜褐斑病是世界性病害(俗稱火撲葉子),普及我省各甜菜主要產區。高溫、降雨頻繁地區發病較重,常因褐斑病減產30%左右,降低含糖量3度以上,甚至失去加工價值。

      1.病狀:褐斑病主要感染甜菜葉片,葉柄也可感染。發病初期,在葉片上形成褐色或紫褐色圓形或不規則形病斑,斑點很小,逐漸擴大,直徑約1~4毫米,在斑點周圍有由花青素形成的赤褐邊緣,后期病斑中央呈灰白色,生有毒層,病斑中央較薄,易破碎,后期病斑常合成一片,葉片干枯死亡。

      2.生病條件:當平均氣溫19℃~23℃(最高不超過29℃,最紙不低于13℃)潛育期最短,一般為5~8天,氣溫上升或下降,都會引起潛育期延長。降水量影響孢子形成,當平均氣溫在15℃以上時,連續兩天降雨,降雨量在10毫米以上,基本溫潤表土的枯葉,隨后再有一次降雨,有利于傳播孢子,10~15天后便可出現首托病斑。每次降雨量20毫米左右,病勢就會迅速進展,病原體數量越多,褐斑病發生越重。

      3.防治方法:①實行4年以上輪作,杜絕重茬、迎茬。②及時應用藥劑防治。目前,防治甜菜褐斑病較好的藥劑有百菌清75%可濕性粉劑,應用濃度0.2%~0.3%,40%百菌清膠懸劑1000倍液。③百菌清防病效果為80%左右塊根產量提高10%~20%,含糖量提高1度左右。不論采取任何措施噴霧選擇24小時晴朗無雨下午4時后進行,遇雨酌情補噴,才能收到較好的效果。

      張家口市萬全區甜菜專業合作社? 梁益 郝繼俊

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