二斑叶螨对螺螨酯抗性和敏感种群相对适合度的研究

［目的］ 研究二斑叶螨对螺螨酯的抗药性与适合度的关系，为该螨的抗性治理提供科学依据。［方法］ 在室内温度(25±1)℃，相对湿度(70±5)%，光照14 h条件下通过构建实验种群生命表，比较二斑叶螨对螺螨酯抗性种群(R)和敏感种群(S)的生长发育和繁殖特征参数，用净增殖率(R0)来确定抗性种群的生物适合度。［结果］ 二斑叶螨抗性种群的若螨期和全世代较敏感种群分别延长0.92 d和0.82 d；雌螨存活时间较敏感种群缩短3 d；二斑叶螨对螺螨酯抗性种群的相对适合度为敏感种群的0.76倍，存在适合度缺陷。［结论］ 在生产上应注意对螺螨酯的合理使用，以延缓其抗性进程，实现可持续治理。

Biological fitness of the spirodiclofen resistant and sensitive populations of Tetranychus urticae

［Method］ Growth and reproduction parameters of resistant populations (R) and sensitive populations (S) of T. urticae to spirodiclofen were compared by constructing life tables at the temperature (25±1) ℃, with the humidity of (70±5)% and illumination of 14 hours. The net reproductive rate (R0) was used to determine the biological fitness of resistant populations. ［Result］ The nymph developmental duration and generation time of the R strain were extended by 0.92 d and 0.82 d, respectively，and the survival time of the R females was shortened by 3 d compared with that of the S populations. The relative fitness value of the R populations was 0.76 times as that of the S populations, and there were fitness defects. ［Conclusion］ Reasonable application of spirodiclofen should be made in production to prolong the process of resistance appearance and realize the sustainable management of pest resistance.