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Franklin D. Jones, Ezra Kraus and John W. Mitchell in the United States of America and Philip S. Nutman and William G. Templeman in the United Kingdom are considered the inventors of weed killers. Before 1941 weed-killing involved such cultural and mechanical controls as soil pH alterations and tillage. There is disagreement as to which of the five scientists invented chemical control first even though the inventions of MCPA, 2,4-D and 2,4,5-T are not in question from that time period.

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