松突圆蚧虫口数量与环境因子的关系

Relations between the population quantity of Hemiberlesia pitysophila and environment factors

系统调查研究表明,在实验室条件下松突圆蚧的死亡率随着降雨量的增加而升高,但降雨对不同虫龄的校正死亡率影响不大;不同树种和不同郁闭度林分的虫口数量存在显著差异,其中黑松的虫口数量最高,马尾松次之,湿地松最低,郁闭度高的林分虫口密度大;上半年阳坡虫口高峰出现时间比阴坡早,下半年阴坡虫口高峰出现时间比阳坡早;迎风坡的虫口密度高于背风坡;不同坡位、不同马尾松群丛、不同树龄中松突圆蚧虫口数量差异不显著。

In laboratory conditions,mortality of the pest population increased with rainfall,and the corrective mortality was no significant differences among different development stages.Contrastive experiments indicated that the population quantity of the pine armored scale（Hemiberlesia pitysophila Takagi） showed significant differences between the host pine of masson pine,Japanese black pine and slash pine,in which the population quantity was the highest on Japanese black pine followed by masson pine,and slash pine was minimum.The population dynamic exhibited some differences between in sunny slope and shady slope.In the second half year,the peak time of the pest population seemed to appear earlier in shady slope than in sunny slope,but to appear later in the first half of year.Significant differences in population quantity between different forest canopy densities,and more scales were found in the forest with high canopy density.In addition,the pest population remained higher in windward slope than in leeward slope.However,no significant differences of the population number were observed among different slopes,different pine associations and different forest ages.