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中山陵园紫金山林区,为南京市东郊重要风景区之一。全区总面积32230亩,基本绿化成林。其中马尾松为优势树种,约占总面积50％左右。 长期以来,林区一直有松毛虫危害。早在1935～1936年,松毛虫曾大发生,当时,国民党反动派对林业不重视,松林死亡达24％。解放后,1954～1955年也发生过一次,由于党和人民政府的重视,发动群众及时进行防治,全林没有受到损失。以后虫情上涨,也都及时进行了防治。1961～1978年还采用航空化学防治10次（表1）,避免了严重灾情。然而,由于长期单纯使用药剂防治,特别是航空化学防治,不分轻重缓急,全面撒药,喷药量愈来愈大,药剂浓度愈来愈高,结果杀伤了害虫无敌,增强了害虫抗药性,造成年年治虫,年年有灾。
Zhongshan Cemetery Purple Mountain Forest, Nanjing is one of the major scenic spots in the eastern suburbs. The total area of 32,230 acres, the basic afforestation. Among them, Pinus massoniana is the dominant tree species, accounting for about 50% of the total area. For a long time, the forest area has been endangered by pine caterpillars. As early as 1935-1936, the pine caterpillars occurred. At that time, the Kuomintang reactionaries did not attach importance to forestry and the death toll in the pine forests reached 24%. After the liberation, 1954 ~ 1955 happened once again. Due to the importance of the party and the people’s government, mobilizing the masses to carry out timely prevention and treatment did not result in any loss to the whole forest. After the rise of insects, also conducted timely prevention and treatment. 1961 ~ 1978 also used aeronautical chemical control 10 times (Table 1), to avoid a serious disaster. However, due to long-term simple use of chemical control, especially aeronautical chemical control, regardless of the priority, the full range of drugs, spraying more and more large, drug concentration is getting higher and higher, killing the pests invincible, enhanced pest resistance, Annual pest control caused by disaster every year.