辣木人工林的主要害虫种类及其空间分布

对广东省梅州市梅江区西阳镇林林试验样地进行调查，初步掌握了辣木人工林为害害虫的 主要种类、发生规律以及空间分布。结果表明：辣木人工林主要害虫种类有含夜蛾 Prodenia litura、小 菜蛾 Plutella xylostella、赤斑白条天牛 Batocera rufomaculata、花蓟马 Frankliniella intonsa、稻管蓟马 Haplothrips aculeatus、斜纹夜蛾 Spodoptera litura 和茶蚜 Toxoptera aurantii 共 7 种；夜蛾与小菜蛾的发生 危害程度已达到重度危害水平，而花蓟马、稻管蓟马与茶蚜则达到中度危害水平，斜纹夜蛾与赤斑白条 天牛的危害程度则为轻度；主要害虫幼虫种群的发生为害高峰时间为 9 月，1 月 -3 月幼虫种群几乎不发 生为害，其余月份幼虫种群虫口密度较低；夜蛾、小菜蛾、花蓟马、稻管蓟马、茶蚜与斜纹夜蛾的幼虫 空间分布均呈均匀分布，而赤斑白条天牛幼虫呈聚集分布，聚集发生的原因是林间外界环境因子与其自 身生物学特性共同相互作用引起的。

Studies on the Species and Spatial Distribution of Main Pests in Moringa spp. Plantations

vince, was conducted to preliminarily grasp the main species, occurrence regularity and spatial distribution of Moringa spp. plantations. The results showed that the main pest species of Moringa spp. plantation include Prodenia litura, Plutella xylostella, Batocera rufomaculata, Frankliniella intonsa, Haplothrips aculeatus, Spodoptera litur and Toxoptera aurantii. The damage degree of Prodenia litura and Plutella xylostella has reached a serious level of harm, while the flower Frankliniella intonsa, Haplothrips aculeatus and Toxoptera aurantii have reached a moderate level of harm, Spodoptera litura and Batocera rufomaculata is mild. The peak time of the main pest larvae is September, the larval population is almost harmless from January to March, and the larval population has lower insect density in other months. The spatial distribution of larvae of Prodenia litura, Plutella xylostella, Frankliniella intonsa, Haplothrips aculeatus, Spodoptera litur and Toxoptera aurantii was evenly distributed, while the larvae of Batocera rufomaculata wwas clustered. The reason for the aggregation was that the external environmental factors in the forest and their biological characteristics interacted with each other.