我国自1973年来大量引种外国松,主要是湿地松、火炬松两种。湖北省林科所在1975年发现国外松产生“多头”症状,影响引种、推广,并进行了调查研究。我们为了解国外松“多头”症状的产生原因和防治办法,1977年先后到黄冈、荆门等地8个场所进行了初步观察,调查(每点随机调查50株),并结合进行了一些盆栽试验,土壤分 Since 1973, China has introduced a large number of foreign pine, mainly pine, loblolly pine two. Lincoln in Hubei Province in 1975 found that foreign pine produce “long” symptoms, affecting the introduction, promotion, and conducted a survey. In order to understand the causes and prevention and cure of the symptoms of loose “bulls” in foreign countries, we conducted a preliminary observation and investigation (in a random survey of 50 plants per spot) in 8 places in Huanggang and Jingmen in 1977 and conducted some pot experiment , Soil points