榕树嫩叶为何枯焦卷曲?
榕树嫩叶为何枯焦卷曲?榕树在8~9月问出现新抽叶片发焦卷曲现象,可能有以下几个主面的原因。
一是病虫原因。如榕树叶斑病,会导致叶片出现黑色斑点,多发生在6~9月份,可剪去病叶,及时用50%的代森铵可湿性粉剂1500倍液进行防治;或者是遭榕管蓟马危害,其刺吸会造成叶片和嫩梢生长畸形,叶片卷缩,但受害部位为深紫红色,南方地区全年均有可能发生,北方地区在棚内或荫棚下均可能发生,可用10%的吡虫啉可湿性粉剂2000倍液喷杀;另外,螨类刺吸危害在高温干燥的条件下也会造成叶片枯焦卷曲,可用25%的倍乐霸可湿性粉剂2000倍液喷杀。
二是环境原因。如突然将其从蔽荫处搬放到阳光强烈处,会造成新叶发焦卷曲;再如空气过分干燥,特别是遭干热风的吹袭,也很容易造成新抽嫩叶发焦卷曲,应加强植株及周围小环境的喷水增湿。
三是误用肥料或农药的原因。如叶面喷洒了高浓度的化肥液,或喷洒了对榕树嫩叶比较敏感(即有药害)的农药,都有可能造成嫩叶发焦卷曲。
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