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果樹苗的一些病害防治

發布日期:2019-05-06 11:05:10  點擊量:874   信息來源:原創

當果樹苗樹上葉片失水青干、葉尖葉緣枯焦、葉片變黃時,應作好以下工作:
(1)尋找病根。先扒開根際土層,挖至根基部,檢查根頸處,發現病斑后,沿病斑向下的追尋主根、側根與須根的發病點。
(2)清除病根。對果樹苗整條爛根,要從基部鋸除或者剪掉。去除的病根要帶出園外深埋或燒毀。
(3)藥劑灌根。為防止果樹苗病株感染其余的根系,應以樹體為要點,挖4-6條深60厘米、寬30-40厘米至樹冠外圍的放射狀溝,灌50%退菌特可濕性粉劑300倍液,或70%的甲基托布津可濕性粉劑800倍液,或200倍硫酸銅藥液,每株施用藥量視樹體大小而定。


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