异视界绒螨（Allothrombium ignotum）种群密度与生态环境的关系

研究表明，无视异绒螨种群密度与棉田连作年限之间呈正相关，与棉田海拔高度和水位之间呈负相关．露地棉田螨量明显高于地膜覆盖棉田．若螨在静水中的浮水时间可持续５．２ｈ．成螨产卵的最适土壤含水量为１２．５％．不同杀虫剂对幼螨杀伤力为溴氰菊酯喷雾＞氧化乐果喷雾＞三氯杀螨醇喷雾＞氧化乐果缓释剂涂茎．因此，发展灌溉棉田、棉花适当连作、棉花生长期采取药剂涂茎治蚜对壮大无视异绒螨种群密度有重要作用．

Relationship between Allothrombium ignotum population density and eco-environment.

Studies on the relationship between A.ignotum population density and main ecological factors in cotton fields show that the population density is positively related to the lasted years of continuous cropping, but negatively related to the altitude and underground water level.The mite density in open cotton fields is significantly higher than that in mulched ones. The floating time of nymph in static water can be lasted 5.2 hours.For the eviposition of adults,the optimum soil moisture content is 12.5%.The killing power of different insecticides and their applicaition ways to larvae is in the order of spraying decamethrin>spraying omethoate>spraying dicofol>painting slow-releasing methoate on the stem.Developing irrigated cotton field.properly prolonging the lasted years of continuous cropping of cotton,and painting cottop stem during its growing period with insecticide to control aphid will have an important role in increasing A.ignotum population density.