The least reach-mark-ratio of four pests densities was rat density.
四害密度控制率最高的为蚊，最低的为鼠；
There is an article in the programme about doing away with the four pests, that is, wiping out rats, sparrows, flies and mosquitoes.
纲要里头有一个除四害，就是消灭老鼠、麻雀、苍蝇、蚊子。
It fully controlled four of 15 common "above-ground" corn pests like corn borers, cutworms and stinkbugs, and partially suppressed three more.
完全控制了15个常见的“地面“害虫中的四个，如玉米螟虫，地老虎和stinkbugs，部分抑制其他三种害虫。
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