檫树叶斑病是近年来在檫树上发现的一种新的病害。该病经初步调查在湖南、江西、安徽、广东等省均有发生。1980年8月,在我省醴陵县桃花公社林场调查,全场1,400多亩檫树林全部发病。发生时,被害株叶片失绿变黄,遍及全树,继而早落,全林景象萧条,远看如同火烧一般。据观察,被害株叶片早落后,虽当年又会重新萌发出二茬小叶,但光合作用减弱,养分积累减少、耗费增加,直接影响到林木的生长,使材积的年生长率相应减少。鉴于该病发生普遍,危害严重,我们于1980-1982年对致病病原,病害发生规律,防治方法,进行了研究。一、病害发生情况调查 1981年8月,我们在湘潭地区的(灵阝)县、茶 檫 Leaf spot is a new disease found on the shrubs in recent years. The disease by a preliminary investigation in Hunan, Jiangxi, Anhui, Guangdong and other provinces have occurred. August 1980, Liling County, Liaoning Province, Peach Blossom Center survey, the audience of more than 1,400 mu of gall forest all the disease. Occurred when the victim leaves greenish turn yellow, throughout the whole tree, and then early fall, the whole forest depression, from afar like fire. It was observed that the leaves of the victim plant early fall, although the re-emergence of the second crop of leaflets, but photosynthesis weakened, reduced nutrient accumulation, increased consumption, directly affect the growth of trees, so that the annual growth rate of the corresponding reduction in volume. In view of the occurrence of the disease is widespread and serious harm, we conducted in 1980-1982 on the pathogens, disease occurrence, prevention and treatment methods. First, the incidence of disease investigation 1981 August, we Xiangtan region (Ling 阝) counties, tea