论文部分内容阅读
分别选择被松红蜡蚧（CeroplastesrubensMaskell）为害的马尾松10株，为害程度为轻、中、重，从东、南、西、北、顶5个方位，每株5个轮次进行全面的虫口、枝条长度调查，结果表明：不同轮次之间差异极显著；不同方向的多重比较差异显著；不同方位的虫口密度板显著。该虫空间分布为聚集分布，回归方程为：M＝2．42＋0．69X，相关系数γ＝0．9745，平均拥挤度与均数相关性极显著；应用I(wao．s)提出的贯序抽样公式，在T（m）≥T（0）时，需要进行防治。
Ten species of Pinus massoniana were selected as Ceroplastes rubensMaskell, which were light, medium and heavy respectively. Five orientations were made from five orientations, ie east, south, west, north and top. The results showed that: the differences among different rounds were extremely significant; there were significant differences in multiple comparisons in different directions; and the population density in different orientations was significant. The spatial distribution of the insects was aggregated distribution, the regression equation was: M = 2.42 + 0.69X, the correlation coefficient γ = 0.9745, the average crowding degree and the mean correlation was significant; application I (wao.s) proposed sequence Sampling formula, T (m) ≥ T (0), the need for prevention and control.