本试验区设在广西钦州市三十六曲林场,属北热带低山丘陵区,周围人口比较稠密,以农林业为主,村镇居民生活及发展砖瓦、石灰等副业均以柴草为能源,因此,对森林及林下植被破坏甚为严重;该林区分布有大面积马尾松纯林和疏残林,植被单纯,经营粗放.为马尾松毛虫大量繁殖提供了适宜条件。六十年代以来,在松毛虫大发生期 The experimental area is located in the forest farm of 36 in Qinzhou City, Guangxi Province. It belongs to the northern tropical low mountain and hilly area with dense population around it. It is dominated by agriculture and forestry. Living and development of brick and mortar, Therefore, the destruction of forest and understory vegetation is very serious. There are a large area of ​​pure P. massoniana forest and sparse forest in the forest area. The vegetation is pure and extensive, which provides favorable conditions for large-scale propagation of Masson pine caterpillar. Since the 1960s, a large occurrence of pine caterpillars