Word: pyrethrum
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...hunter" pulls a trigger, releases a high-pressure charge which saturates the air of tent, hut, or dugout with a quick insect-killing mixture of sesame oil and extract of pyrethrum flowers, vaporized by Freon. Aerosol, says the Army, tracks down mosquitoes to the last, remote fold of clothing and tent. Chief producer of aerosol is Westinghouse. But Freon is still the essential spreading agent of aerosol...
...earth-is being used to protect the residents of Delhi, India's capital, and the U.S. troops quartered there from the epidemic now raging among the 100,000,000 people of northwest India. Gangs of trained workmen go from house to house all day spraying a mixture of pyrethrum insecticide (5%) and kerosene (95%) on the walls and rafters where the night-flying mosquitoes rest. The sprayers are all lads of good caste, so no highborn Hindu will be outraged by their attentions to his residence, outhouse and cowshed, each of which must be re-sprayed every week...
...Pyrethrum powder, a standard insecticide which is made from a certain chrysanthemum plant, used to be imported largely from Japan. In recent years coffeegrowers in Britain's Kenya Colony in Africa have cultivated the plant, now grow enough for their own use and the whole U.S. besides-if the U.S. can get it. Chemists, however, have discovered ways to stretch the pyrethrum supply by adding "synergistic" compounds-sesamin from sesame oil and asarinin from the southern prickly-ash bark-which make a more poisonous blend than pyrethrum alone...
...Offered her a market into which she dumped $18,108,000 worth of odds and ends in the first five 1939 months: crabmeat, tea, pyrethrum flowers (for insecticides), chinaware, electric light bulbs, zippers, toys...
...hygiene against inbound contagion. To halt immigration of any more such pests as the corn-borer, Japanese beetle or red scale, the U. S. Public Health Service insists that all planes from South America or Asia must be sprayed. Pan American Airways conscientiously sprays its Pacific Clippers with a pyrethrum extract at each stop. Aircraft from Canada and Europe, where pests and diseases are rarer than in the plague-laden Orient, are merely inspected...