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烟夜蛾以幼虫取食烟叶,给烟叶生产带来巨大损失.运用地统计学的方法,研究了湖北恩施烟区烟夜蛾幼虫的空间结构和发生动态.结果表明:恩施烟区烟夜蛾幼虫在烟叶移栽后40 d开始为害,至烟叶成熟前期达到高峰;球形-指数套合模型为烟夜蛾幼虫田间分布的主要模型,属聚集分布;空间变异度C/(C0+C)均大于0.75,说明其结构性变异较大,随机性变异较小;烟夜蛾幼虫在烟叶旺长期进行了较大迁移,之后其数量趋于稳定,烟叶成熟期尤其稳定.
The tobacco larvae fed on the tobacco budworm (H. litura), which caused huge losses to the tobacco production.The spatial structure and the dynamics of the larvae were studied by using geostatistics methods.The results showed that the tobacco budworm, The larvae began to damage 40 days after transplanting and peaked at the premature stage of tobacco leaf. The model of spike-index was the main model for the distribution of the larvae in the field, belonging to the aggregation distribution. The spatial variability C / (C0 + C) Greater than 0.75, indicating that the structural variation is larger and the random variation is smaller. The larvae of Plutella xylostella migrate greatly in the long-term tobacco leaves, and then the number tends to be stable, and the tobacco leaves are especially stable during the mature period.