国外松芽流脂病发生与防治

Causes of resinosis of exotic pines and its control method

近年来 ,浙江省局部地区国外松纯林受芽流脂病危害较为严重。通过定点观察、分离培养、光镜检查、电镜观察、微量元素测定和用硼砂防治罹病松树等方法 ,基本查清国外松芽流脂病在浙江省的发生情况 ,明确了国外松芽流脂病的 3种症状 :顶芽枯死型、丛枝型和枯梢型。国外松芽流脂病是由于松树自身和土壤中的微量元素———有效硼含量不足引起的生理性病害。用喷洒 3 0g·kg-1或 5 0g·kg-1硼砂溶液防治该病效果显著 ,防治区病情指数与对照相比平均下降 38 5 ,松树的年平均高生长量也比对照大 1 4 8cm。表 4参

In recent years,pure forests of exotic pines were seriously harmed by resinosis in some areas of Zhejiang.Using the method of plot observation,separation culture,light microscope examination,electric microscope,observation,measurement of trace elements,as well as controlling the disease for harmed pure forests with borax etc.,the disease situation was found out in Zhejiang.Its symptoms could be divided into 3 types:the type of dead terminal leaf buds,the type of bunch branches and the type of spike tops.The resinosis is a physiological disease,and is caused by lack of effective boron content in soil and tree body.Obvious control effect could be obtained by spraying 3 0 g·kg -1 or 5 0 g·kg -1 of borax solution.The disease indexes in control plots decreased by 38 5.The average increment of tree height in control plot is 14 8 cm higher from that in contrast plot.