<正>从牡丹园9批64个受病害牡丹样品中分离获得137个分离物，经筛选、纯化、回接试验，依其培养性状和形态特征，将病原菌鉴定为茄腐皮镰孢霉（Fusarium solani）。病原菌以菌丝和分生孢子在根部越冬，5～7月为发病盛期。病害的发生与牡丹重茬、土壤酸碱度等因子密切相关。经室内毒力测定和田间药效试验，筛选出了绿亨1号、绿亨2号和50%多福可湿性粉剂等防治根腐病的有效药剂，在新牡丹园防治效果达90%左右，感病指数控制在5左右，对老牡丹园防治效果80%左右，感病指数控制在10左右。

The 20 Eucalyptus clones test analyzed results involving 5 species showed that there were highly significant differences in growth and other characteristics among clones. Repeatability of clones and individual retained the stable level at different ages with 61.46%～93.84% and 28.51%～79. 19% for different characteristics studied, respectively. There were closely phenotypic,genetic and environmental correlation among H,DBH and SV each other. Branch size (BR) had significant negative correlation with growth characteristics. At an age of 5. 5 year old, the mean value of individual volume (SV) of the fastest clone (TH9113) (0. 092 08 m3) was 4. 078 0 and 1. 962 9 times of the worst clone (CP01) and the whole population (all clones), respectively. All clones were categorized into 4 classes by u sing principal component analysis,and the fastest class was 264. 99% higher than the lowest class with a obvious level of productivity increasing.