松针褐斑病病原、抗病机制和综合治理技术研究

Study on the pathogen,resistance mechanism and integrated management of Lecanosticta acicola(Thum.)Sydow.

湖南省 1 994年 8月首次发现松针褐斑病 ,主要分布在江华县、江永县和双牌县 1 1个乡镇场 ,面积为 46 7.8hm2 ,1 995年至 1 997年 ,通过实施砍、剪、清、造、防、监、检综合治理 ,病害的危害面积减少到 2 2 .7hm2 ,下降了 95 .1 % ,发病区严重死亡株率控制在 1 %以下。同时研究证实不同的湿地松病原菌株之间的脂酶图谱中存在不同的差异 ,湿地松、黄山松和马尾松在超氧化物歧化酶 (SOD)活性、苯丙氨酸解氨酶 (PAL)活性和木质素含量的差异反映出寄主的抗病性差异 ;病害发生流行区域性研究结果表明全省处于主要流行区的县 (市 )有 1 2个 ,偶然流行区的县 (市 ) 2 5个 ,相对安全区的县 (市 )

The disease was firstly found in Jianghua county in August,1994.The occurrenca area were 467.8 hectares with distribution of 3 counties,11 towns.The damage area of disease decreased into 22.7 hectares and the rate of death tree was controlled less than 1% by integrated management from 1995 to 1997.The research showed the differences of phosphtaese isozyme PAGE patterns of the different isolates.The active SOD and PAL and the amount of xylogen in Pinus elliottii、P.taeda、P.massonuana reflected the differences of host resistance.The study result of disease epidemic area showed that there are 12 counties in main epidemic area,25 counties in incidental epidemic area and 71 counties in relative safe area.