Douglas Josh, Umina Paul, Macfadyen Sarina, Hoffmann Ary
School of BioSciences, Bio21 Institute, The University of Melbourne, Parkville, VIC, 3010, Australia.
cesar, 293 Royal Parade, Parkville, VIC, 3052, Australia.
Exp Appl Acarol. 2018 Dec;76(4):487-506. doi: 10.1007/s10493-018-0331-2. Epub 2018 Nov 28.
Halotydeus destructor and Penthaleus major are species of earth mite commonly found at high densities in agricultural fields in Australia and other parts of the world. These mites pose a risk to a range of winter crops and pastures when seedlings emerge in autumn. In order to predict likely mite pressure, we investigated whether autumn densities in pastures can be determined from agronomic and environmental field variables. For H. destructor, field densities showed little association with a range of vegetation variables but could largely be explained using the variable field type, with high densities present when fields had mixtures of grass, clover and weeds. For P. major, we found a regional effect. In the region where most data were available, P. major field densities were associated with grass abundance, whereas an association with field type was significant but different to that found for H. destructor. For both species, densities were not associated with rainfall, but there was a weak association with soil moisture capacity. We discuss how these results can help in managing these important pest mites.
毁澳小袋螨和大五节叶螨是常见于澳大利亚及世界其他地区农田、密度较高的土螨种类。当秋季幼苗出土时，这些螨虫会对一系列冬季作物和牧场构成威胁。为了预测可能的螨虫压力，我们研究了是否可以根据农艺和环境田间变量来确定牧场秋季的螨虫密度。对于毁澳小袋螨，田间密度与一系列植被变量几乎没有关联，但很大程度上可以用田间类型这一变量来解释，当田间有草、三叶草和杂草混合时，密度较高。对于大五节叶螨，我们发现了一种区域效应。在数据可得的大多数地区，大五节叶螨的田间密度与草的丰度有关，而与田间类型的关联显著，但与毁澳小袋螨不同。对于这两个物种，密度与降雨量无关，但与土壤持水量有微弱关联。我们讨论了这些结果如何有助于管理这些重要的害虫螨虫。
