Data for onset of summer diapause of Halotydeus destructor, redlegged earth mite, in grazed pastures.

This collection provides data describing the seasonal occurrence and abundance of redlegged earth mites (RLEM) Halotydeus destructor, in grazed annual pastures in south western Australia. In a supplementary study the patchy distribution of RLEM in a pasture was investigated. Also data on the onset of summer diapause were collected from pastures across southern Australia over a nine year period. In a further study the importance of spray timing in the spring was tested at four sites.\nLineage: RLEM were sampled from 100 cores/week at two pasture sites for the period of mite activity (May to October) between 1990 and 1992 in south western Australia. Data was collected on:\n- Count of individuals per development stage\n- Count of eggs laid on pasture and the soil surface (from twenty cores per week)\n- Count of eggs from dissected adult female mites (collected each week)\n- Count of diapausing eggs from bodies of dead mites (in December)\n- Populations in short and tall patches in grazed pastures were counted from another site to determine the effect of pasture height on mite distribution\nThe onset of summer diapause in RLEM was investigated by counting the presence of diapause eggs in females. In spring mites were sampled with a vacuum sucker, and 50 or 100 adult female RLEM were dissected and numbers of “winter eggs” and “diapause eggs”/female counted. RLEM were sampled at intervals from 65 sites, many several times over a nine-year period. These data were used to predict the dates of onset of diapause in eggs across the whole distribution of RLEM in southern Australia. This critical timing was used in the TIMERITE control strategy. \nTrials were carried out at four sites in SW Australia in 2000-2002 to test the effect of spraying outside the recommended TIMERITE date on mite control.

本数据集收录了澳大利亚西南部放牧一年生草地中红腿大地螨（redlegged earth mite, RLEM，*Halotydeus destructor*）的季节发生动态与种群丰度数据。本研究的补充实验探究了草地内红腿大地螨的斑块状分布格局。此外，研究团队于9年周期内从澳大利亚南部多地草地采集了红腿大地螨夏季滞育启动相关数据。另有一项实验在4个试验点开展，验证了春季施药时机对害螨防控的重要性。

数据集溯源：1990至1992年，研究人员在澳大利亚西南部2个草地样地的害螨活动期（5月至10月）内，每周采集100个土芯样本开展红腿大地螨取样。本次采集统计的指标包括：
- 各发育阶段个体数量统计
- 草地及土壤表面产卵量统计（每周采集20个土芯样本）
- 解剖成年雌螨后体内卵量统计（每周取样）
- 死亡螨体滞育卵数量统计（12月开展）
- 在另一试验点统计放牧草地内短草区与长草区的害螨种群数量，以明确草地高度对螨类分布的影响

红腿大地螨夏季滞育启动的相关研究通过解剖雌螨并统计其体内滞育卵存在情况开展。春季采样时，研究人员使用真空吸捕器采集害螨，解剖50或100头成年雌螨，统计每头雌螨的“越冬卵”与“滞育卵”数量。研究团队在9年周期内间隔性地对65个样点进行红腿大地螨采样，其中多数样点被多次取样。上述数据被用于预测澳大利亚南部红腿大地螨全分布区内螨卵滞育启动的日期，该关键施药时机被应用于TIMERITE防控策略中。

2000至2002年，研究团队在澳大利亚西南部4个试验点开展防控试验，以验证偏离推荐TIMERITE施药日期的施药方案对红腿大地螨的防控效果。