脱毒与普通柠檬苗栽培评价:Ⅰ.树体生长、产量与感病性差异

摘要

Plant growth,fruit yield and disease susceptibility of the lemon trees from seedlings of selected virus-free and common varieties were monitored for 6 years.It was found that the virus-free variety had higher crowns,by 1.9 ％ to 17.75 ％,and the diameter of its graft-set interface 1.81％ to 24.61 ％ greater than the common variety.In the third year,the per hectare fruit yield of the virus-free lemon trees was higher than its counterpart,but the difference was not significant.However,the difference became significantly higher at 24.70％ to 36.24％ afterward.And,the common lemon variety showed a continuous decline on fruit yield in the 5th and 6th year.In addition,they were infected with exocortis and tristeza diseases in the second year.After the 3rd year,the infection rates of exocortis were 9.5％-30.3％,and tristeza 4.5％-14.0％.%选择脱毒柠檬苗与传统普通柠檬苗进行栽培,通过6a时间对柠檬生长、产量与感病性进行观察,结果表明:脱毒柠檬树体冠幅度高于普通的冠幅度,比普通树体增加1.9％～17.75％；脱毒柠檬嫁接口粗度较普通柠檬的高1.81％～24.61％；2种处理的前期单位面积产量,脱毒柠檬的比普通柠檬的高,但差异不显著,在第4年进入盛产期后,脱毒柠檬的单位面积产量比普通柠檬高24.70％～36.24％,且差异达到显著水平；普通柠檬定植第2年发现感染衰退病、裂皮病,第3年以后,感染裂皮病率为9.5％～30.3％,感染衰退病率为4.5％～14.0％；普通柠檬定植第5或6年后产量表现逐年下降的趋势.