Timeline

Important Dates in Pyrethrum History

1860

 

    Pyrethrum powder first introduced in the United States

 

1881

 

    Pyrethrum cultivation introduced to Japan from England

 

1902

 

    McLaughlin Gormley King Company (MGK®) formed

 

1910

 

    MGK imports spices that are packed in pyrethrum flowers to keep away insects

 

1912

 

 

    Japan becomes the principle supplier of pyrethrum flowers to the U.S.

    Supplies from Dalmatia cut off by World War I

 

1915

 

    MGK imports pyrethrum powder for insect control

 

1919

 

 

    Kerosene extracts of pyrethrum begin to be used in the U.S.

    Charles Gnadinger leaves the USDA and joins MGK

 

1924

 

    Staudinger and Ruzicka publish paper on pyrethrum identification

 

1926

 

    Japan is supplying 82% of U.S. pyrethrum flowers

 

1928

 

    Pyrethrum growing is introduced in Kenya

 

1929

 

 

    Gnadinger publishes method to quantitate pyrethrins

    Gnadinger develops process to extract pyrethrins from flowers

 

1931

  

    Japan supplies 91% of pyrethrum flowers to U.S.

 

1932

 

    Commercial production of pyrethrum flowers begins in Kenya

 

1933

 

 

 

    MGK initiates projects to grow pyrethrum flowers in Colorado

    Commercial production of pyrethrum flowers begins in Brazil

    First pyrethrum flowers from Kenya imported into the U.S.

 

1938 

 

    First pyrethrum flowers from Tanganyika imported into U.S.

 

1939

 

    MGK assists with the construction of a pyrethrum extraction plant in South Africa

 

1940

 

    First AOAC method for pyrethrin quantitation published

 

1941

 

 

 

 

    Importation of pyrethrum flowers from Japan prohibited-World War II

    Kenya becomes primary supplier of pyrethrum flowers to the U.S.

    MGK assists with construction of a pyrethrum extraction plant in India

    Patent for the aerosols is issued

 

1943

 

 

 

    Gnadinger and Clarke develop pyrethrum refining process for MGK 

    New Process reduces staining, allergens, and removes freon insolubles

    Patent for DDT is issued, which became a significant competive threat to pyrethrum

 

1945

 

 

    First Kenya extraction plant built by British Ministry of Supply 

    Kenya has 55,000 acres devoted to pyrethrum cultivation

 

1950

 

    Crude form of MGK 264 Insecticide Synergist first commercially available

 

1956 

 

   Kenya commissions crude extraction plant that can process 3000 tons of flowers per year

 

1961

 

 

    Kenya commissions first pyrethrum refining plant

    Kenya increases crude extraction capability to 6000 tons per year

 

1963

 

 

 

    MGK and Mitchell Cotts form PIA in Ecuador to grow and extract pyrethrum flowers

    MGK and Mitchell Cotts form a joint venture in Tanzania to grow and extract pyrethrum

    Water based aerosols developed

 

1965

 

Interpretation 54 was issued in the U.S. that allows “Non-toxic to humans and pets” to be on labels of pyrethrum products

 

1967

 

Pyrethrins, Piperonyl Butoxide, and MGK 264 Insecticide Synergist are approved for use in food handling establishments

 

1972

 

 

 

 

    The Environmental Protection Agency was formed in the U.S.

    EPA withdraws Interpretation 54 concerning labeling

    MGK hosts the first Pyrethrum Symposium in Minneapolis

    EPA bans most uses for DDT

 

1974 

 

Kenya commissions new crude extraction plant with the capacity to process 12,000 tons of flowers per year

 

1977

 

Kenya commissions new pyrethrum refining plant that has the capacity to process 2 tons of crude oleoresin per day

 

1985

 

 

    EPA issues data call-in for pyrethrins

    Py Task Force formed in the U.S. to develop data for data call-in

 

1990

 

MGK begins to work with CIG (now BRA) to analyze and refine pyrethrum from their growing  and (crude) extracting trials in Australia

 

1992

 

    MGK hosts the second Pyrethrum Symposium in Honolulu

 

1995

 

    MGK begins to investigate the growing of pyrethrum flowers in Chile

 

1998

 

    MGK commissions pyrethrum refining process at its Chaska plant

 

2001

 

    Pyganic introduced in the U.S. market for organic crops

 

2005     MGK's Riptide used in new Residential Mosquito misting market

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