Question: why ddt was considered a boon in 1940s?
Answer: DDT's use as a pesticide proved to be a huge boon to war efforts. Prior to the discovery of DDT, pyrethrins were among the major insecticides in use. ... It was due to this shortage that DDT, instead, became the Allied Forces' insecticide of choice to control insects that were vectors for typhus, malaria and dengue fever.