朱砂叶螨成螨在水中的耐受力

【目的】明确朱砂叶螨Tetranychus cinnabarinus(Boisduval)在雨水中的耐受能力,为评价雨水对朱砂叶螨的控制作用提供理论依据。【方法】本文通过采用玻片浸渍法和录像技术,对朱砂叶螨沉于水中的沉浮比例、耐受力以及足的摆动频率进行研究。【结果】在棉花叶片上接螨饲养5 d后(92.79%±0.55%)的朱砂叶螨沉于水中的比例极显著高于2 d后(42.72%±2.37%)的;3日龄的雌(297.4±16.1)min、雄(297.7±7.4)min成螨之间在水中存活时间差异不明显。雌雄成螨在水中最短存活时间分别为48 min和45 min;雌雄成螨数量大约在300 min内死亡达到一半,雌雄成螨在水中最长存活时间分别为773 min和856 min;雌雄成螨死亡数在时间上分布不均匀。沉在水中朱砂叶螨雌雄成螨死亡过程中表现为:足的摆动频次由高到低,足的摆动时间也非连续状态。【结论】朱砂叶螨成螨在水中有一定的耐受能力。

Tolerance of adultTetranychus cinnabarinus to submersion in water

Objectives] To clearly define the tolerance of adultTetranychus cinnabarinus (Boisduval) to submersion in water, and provide a theoretical basis for evaluating the effect of rainfall on Integrated Pest Management of this pest. Methods] The proportion that sank, water survival, and leg sway frequency, of adultT. cinnabarinus,were determined using the slide dipping method and video technology.Results] The proportion of mites that sank was significantly higher when these had fed on cotton leaves for 5 d (92.79%±0.55%) compared to those that had fed for just 2 d (42.72%±2.37%). The average survival time in water of 3 day old male (297.7±7.4) min and female (297.4±16.1) min adultswas not statistically different. The shortest survival times recorded for 3 day old male and female adults were, respectively, 45 min and 48 min. Immersion for about 300 minutes was sufficient to kill half of all 3 day old male or female adults. The longest survival time in water of 3 day old male and female adults were 856 min and 773 min, respectively. The distribution of mortality among male and female adults was uneven in time. In the process of death, adultT. cinnabarinus generally displayed a reduction in leg swing frequency. The duration of leg swinging behavior was not continuous. Conclusion] AdultT. cinnabarinushave some capacity to tolerate submersion in water.