Abstract: Periodical observations demonstrated that the current shoot of early diseased branch grew continuously when current shoots ceased to grow;their leaves turned into small in size and appeared to be bud scale in shape;numerous knots were formed together with fine,slender sprouts in a trailing plant shape.Generally,the fruiting bodies began to develop on the terminal end of early diseased shoots in October,and then branches produced.Until next year,the brooms were gradually formed and densely aggregated.Milky cheese like colonies might be isolated from diseased young shoots,fruiting bodies and diseased tissues around the fruiting bodies by enhanced surface sterilization.The current shoots were diseased by way of leaf core inoculation of tender shoots,and the incubation period being about more than 40 days.According to the development or symptoms and reisolation of pathogen,it is found that witche's brooms was caused by Balansia take(Miyke) Hara.