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    棗樹炭疽病 早防早放心

    mNMjWFstf

    棗炭疽病,是棗果實的主要病害,亦能侵染棗吊、葉片、棗頭和棗股。果實染病后,果肩變為淡黃色,進而出現水漬狀斑點,并逐漸擴大為不規則黃褐色斑塊,中間出現圓形凹陷病斑,嚴重時擴大成片造成果實早落,果核變黑,病果味苦。分生孢堆具水溶性粘膠狀物質,需在有雨水溶化條件下傳播,不能風傳。發病程度與當年雨水多少及樹勢強弱有關,雨水多,雨水早,即發病早而重,反之則晚而輕。

    防治棗炭疽病的主要環節有:

    (1)春季清園:摘除樹上殘留的棗吊,集中燒毀或深埋。

    (2)噴布殺菌劑:在菌種傳播的前后,抓住關鍵時期噴殺菌劑,應在6月下旬進入7月份后,每隔7~10天就要噴一次殺菌劑,噴絡安3號1000倍液或星標6000~8000倍液+美鈣鎂1000~1500倍液等。殺菌藥不要只認準一種。治療性、保護性和治療加保護性交替使用,建議棗農用“絡安2號”、“絡安4號”和“絡安3號”交替噴打。(3)合理施肥:減少氮肥施用量合理增加磷、鉀肥,增強樹勢,提高抗病能力。

    作者:中農樂果業科學研究院講師 鐘學智

    歡迎廣泛轉載 服務全國果農

    但轉載時請注意:來自今日頭條【棗產業聯盟】如未按要求轉載,一律視為侵權


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