四害 meaning in English

the four pests (老鼠 rat; 臭虫 bedbugs; 苍蝇 fly; 蚊子 mosquitoes)

Away with the "four pests" !
消灭“四害”！
Back then , families without pests would be rewarded with a red flag , while those who did a less satisfactory job were warned with a white flag
那时，没有“四害”的家庭会被授予一面小红旗，而做得不好的家庭则会得到一面白旗，以示警告。
" new york has more rats than chicago because chicago has more alleyways , " said leonard douglen , executive director of the new york pest management association
纽约四害管理协会执行主席里奥纳多?道格伦说： “纽约老鼠之所以比芝加哥多，是因为纽约的大街小巷不象芝加哥那么发达。 ”