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在田间调查基础上,研究了竹笋基夜蛾[Kumasia kumaso(Sugi)]幼虫在早竹林和红哺鸡竹林中的种群动态。结果表明,竹笋基夜蛾幼虫在两种竹林中种群消长曲线均呈倒V形变化。种群密度高峰期出现在4月下旬,在红哺鸡竹林中种群密度高峰较在早竹林中推迟约6 d。通过频次分析法和9种聚集度指标对竹笋基夜蛾幼虫在早竹和红哺鸡竹林内的空间分布型进行了测定。结果表明,竹笋基夜蛾幼虫在两种寄主竹林中的空间分布格局均符合Neyman分布和P-E核心分布2种分布模型。各聚集度指标也均表明竹笋基夜蛾在早竹和红哺鸡竹林中呈现聚集分布。聚集原因是由于环境因素引起的。
Based on field surveys, population dynamics of Kumasia kumaso (Sugi) larvae in bamboo and red-feeding bamboo forests were studied. The results showed that the larvae of Spodoptera exigua showed an inverted V-shape in both bamboo forests. The peak of population density occurred in late April, and the peak of population density was delayed about 6 days in bamboo forest of Hongzhu chicken compared with that in early bamboo forest. Spatial distribution patterns of the larvae of bamboo bud larvae in bamboo and red-feeding bamboo were determined by frequency analysis and nine kinds of aggregation indexes. The results showed that the spatial distribution patterns of bamboo shoot larvae in both host bamboo forests were in accordance with Neyman distribution and P-E core distribution. The clustering index also showed that bamboo shoots in the early bamboo and red feeding bamboo forest aggregation distribution. Aggregation is due to environmental factors.