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| | 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 ki... | | 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. | | 文摘来源 | |   |
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