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油桐(Aleurites fordii)是我省主要经济林木之一。现存油桐林面积420万亩,主要分布于遵义、铜仁、黔南、黔西南等27个县市。常年产量达1亿多斤,名列全国第二。近几年来产量大幅度下降,而油桐角斑病(Cercospora aleuritidis Miyake)危害是造成减产的主要原因之一。为摸清该病害在我省的分布范围、危害程度及发病条件,为防治该病提供可靠的依据。我们对17个县的主要林分设置了274块标准地进行了调查。调查面积约10248亩。现将调查结果报道如下。
Aleurites fordii is one of the main economic trees in our province. The existing tung oil forest area of 420 mu, mainly in Zunyi, Tongren, Qiannan, Qianxinan and other 27 counties. Annual output of 100 million kilos, ranked second in the country. Output has dropped dramatically in recent years, while the damage caused by Cercospora aleuritidis Miyake is one of the major causes of yield reduction. To find out the distribution of the disease in the province, the extent of harm and the incidence of conditions, to provide a reliable basis for the prevention and treatment of the disease. We conducted a survey of 274 standards set for the main forests in 17 counties. The survey area of about 10248 acres. Now the survey results are reported below.