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油桐(Aleurites fordii Hemsley)是我国南方重要的经济油料树种。我区六马(包括镇宁六马、江龙、募役区,紫云火花、水塘、猴场区,关岭花江区等地)是我省油桐主产地之一。据统计,现有桐林13万多亩,年产桐籽700～1000万斤。但近年来不断发生桐树枯死现象,少则几亩,多则几十亩,病株呈单株或丛状分布。为了摸清其枯死原因并找出防治方法,我们于1986.5～9月对六马油桐集中产地进行了全面调查,设置调查样地75个,采集标本50余号,土壤样品20个,现初步摸清了枯死原因。
Aleurites fordii Hemsley is an important economic oilseed species in southern China. My area six horses (including Zhenning six horses, Martial Law, recruitment service area, Ziyun sparks, reservoirs, monkey area, Guanling and other places in Huajiang) is one of the main producing areas of Tung Oil in our province. According to statistics, the existing Tonglin 130,000 mu, with an annual output of 700 to 10 million kg Tong seed. However, in recent years, the phenomenon of withered dead Tung, ranging from a few acres, as many as dozens of acres, diseased plants were single or plexiform distribution. In order to find out the causes of its death and find out the prevention and treatment methods, we conducted a comprehensive survey of the concentrated producing areas of Liuma Tung in 1986.5 ~ September. We set up 75 sampling plots, collecting more than 50 specimens and 20 soil samples, Find out the cause of death.