求翻译：利用分离纯化的玉米大斑病强毒力菌株和混合菌株，通过人工接种，对2008-2009年从东北地区收集的269份玉米品种进行温室和大田玉米大斑病抗性水平评价。是什么意思？

Separation and purification of corn leaf blight and mixed strains of virulent strains through artificial inoculation, collected from the Northeast-2008-2009 maize varieties in greenhouse and field corn leaf blight resistance level evaluation.

Using separation purification of corn big spot disease strains and mixed strains the drug power, through artificial inoculation, the northeast from 2008 - 2009 collection of 269 varieties of maize for greenhouse and Daejeon corn big spot disease resistance level evaluation.

Using the separation purification corn big spot sickness full strength strength strain and the mix strain, through the artificial infection, carry on the greenhouse and the big field corn big spot sickness resistant level appraisal to 2008-2009 year from the northeast area collection 269 corn variet

Separation and purification of corn leaf blight and mixed strains of virulent strains through artificial inoculation, collected from the Northeast-2008-2009 maize varieties in greenhouse and field corn leaf blight resistance level evaluation.

Separation and purification of corn leaf blight and mixed strains of virulent strains through artificial inoculation, collected from the Northeast-2008-2009 maize varieties in greenhouse and field corn leaf blight resistance level evaluation.