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      番茄青枯病的識別與防治

      時間: 2019-08-12      來源:     



      ? 最近有菜農反映,自家大棚番茄不少整株死亡,但死亡植株葉片仍為綠色,問是什么病?該咋防治?

       筆者判斷,這是番茄青枯病。該病發病初期,植株中午萎蔫,早晚可恢復,兩三天后全株枯死,但枯死株仍為綠色。剖開病莖,可見維管束變為黑褐色,髓部變褐腐爛,用手擠壓或橫切病莖放入水杯中可見有白色細菌黏液溢出。

       防治辦法:1.注意調節土壤pH值。對偏酸土壤可適當撒施生石灰,每畝不超過100公斤,調節酸堿度。

        2.實行輪作。重病田最好實行2~3年輪作。

        3.選用抗病品種,或采取嫁接栽培防病。

        4.培育壯苗。在幼苗生長旺盛期,盡量停止中耕,防止中耕傷根引致細菌侵入。番茄的施肥應氮磷鉀合理配合,也可在苗期噴灑10毫克/升的硼酸,促進維管束生長,提高植株抗病力。

       5.發病初期及時清除病株,帶到田外集中銷毀,并噴藥防治。可選用14%絡氨銅水劑300倍液、77%可殺得可濕性粉400~500倍液、50%琥膠肥酸銅可濕性粉400倍液灌根,每株灌300~400毫升,每7~10天1次,連灌2~3次。? 任縣農業農村局 徐立洋

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