雪松和黄山松对松材线虫(Bursaphelenchus xylophilus)的抵抗性

 过去3年的调查表明,在江苏南京镇江松材线虫病区内雪松(Cedrus deodara)自然枯死相对很少,在采得的22株枯死雪松松材中,从未查见松材线虫。在1987-1989年用松材线虫分离物1号、3号或4号(分别分离自江苏和深圳罹病黑松Pinus thunbergii和马尾松P.masso-niana病材中),分5次接种60株4或7-8年生雪松苗或20多年及30多年生雪松树,仅2株4年生接种苗发病死亡,从死苗中分离到的松材线虫数量远低于接进的虫量。可见雪松苗期至成材期在江苏病区都能高度抵抗松材线虫。

THE RESISTANCE OF DEODAR CEDAR AND YELLOW MOUNTAIN PINE TO PINE WOOD NEMATODE,BURSAPHELENCHUS XYLOPHILUS

An investigation on the Deodar cedarCedrus deodara Loud] wilt in the areas infected with pine wood nematode(PWN) Province was carried out for the past three years in Jiangsu,No PWN was found in all 22 samples collected from the wilted trees.Sixty 4-yr or 7-8-yr old seedlings and fourty four over 20-yr or 30-yr old trees of Cedrus deodara were tested by artificial inoculation with PWN ≤ of 1000,5000,or 20000 per seedlings and 5000,20000,or 50000 per tree in Nanjing during 1987 to 1989,the results showed that only two 4-yr old seedlings were infected and died.The 4-yr old seedlings of Yellow Mountain pine(Pinus taiuanensis) from Yellow Mountain of Anhui Province were artificially inoculated with 1000 or 5000 Pwns in Nanjing and zt showed a tigh susceptibility.