徐州市香樟黄化病的综合防治技术研究

通过对徐州市东坡广场有代表性的80株香樟树黄化病进行16个不同组合处理的防治试验,分别研究了处理前后叶片叶绿素含量的变化率、黄化叶片率的变化率、土壤含铁量的变化率和发病程度变化率。结果发现,在对黄化病株同时采用每厘米胸径土壤施硫酸亚铁60 g、土壤施柠檬酸铁20 g、树体注射硫酸亚铁1 g、树体注射柠檬酸铁5 g的方法,可以使得香樟黄化病的防治效果达到最好。并建议做好香樟黄化病的预防和养护管理,定时普查香樟的立地情况,做好土壤更换工作,根据天气情况及时做好保墒措施,在冬季做好香樟的防寒防冻措施。

Research on integrated control technology of Camphor yellowing disease in Xuzhou

By dividing 80 representative camphor trees on Dongpo Square into 16 groups to prevention test,we researched the change rate of chlorophyll content of leaves,the change of rate of yellowing leaf number,the change rate of soil iron content,and the morbidity degree. It was found that such measures as fertilizing sixty grams ferrous sulfate per cm DBH,twenty grams ferric citrate per cm DBH in soil,injecting one gram ferrous sulfate per cm DBH and five grams ferric citrate per cm DBH into the tree body at the same time can give good effect of preventing camphor yellowing. Besides,we granted that camphor yellowing disease＇s precaution and trees＇ maintenance,including regular screening of camphor trees＇ site conditions,replacement of good soil,moisture conservation measures in a timely manner in accordance with weather conditions,and frost-preventing measures in winter were indispensable.