三角新小卷蛾幼虫空间分布型及抽样技术研究

The Space Distribution Model of the Larva of Dletheutes Leucaspsis Meyrick and the Technology of the Corresponding Sampling Method

在三角新小卷蛾多发代幼虫盛发期间 ,用全查法调查龙眼果株幼虫数 ,用 5种聚集度指标拟合评判其遵从的空间分布型 ,均符合聚集型分布。采用对角线等 5种抽样方法测定与全查实测比较 ,无显著差异 ,但以分行式相对较好。在密度为 5 0 12 6头 /株时 ,抽测 4 3株左右 ,即可取得与全查实测相接近的结果。

In the vigorous occurring period of Dlethreutes leucaspsis Meyrick larva,the authors investigated the larva number of longan fruit plant with the method of thorough searching Five kinds of accumulation degree index were used for the matching judge of the space distribution model kept by the mentioned larva The result showed that the space distribution coincided with that of the accumulated model The five sampling methods such as the diagonal method etc had also been used in the evaluation Comparing with the thorough searching method,there was not obvious difference between the two methods However,the line selecting style was comparatively better When the density of larva was 50-126/per plant,about 43 plants was sampled and examined,the approximate result could be obtained as that of the thorough searching method