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Newspaper
Lancaster Farming
Location
Lancaster, Pennsylvania, United States of America
Date
Feb 08, 1957
Page
11
The article explains the heel fly lifecycle from spring chase to egg laying on cattle heels. Larvae burrow through bodily tissues then stay under the skin for 35 to 60 days before emerging as adult flies after pupation in soil. Repeated cycles continue with new egg laying.
Researchers identify two insecticides effective against cattle grubs inside animals. ET-57 emerges as the leading compound, administered orally as a drench or pill and dissolving to circulate quickly through the digestive tract.
USDA researchers report ET-57 and Bayer 21/199 as systemic insecticides that could kill cattle grub larvae if administered before they reach the back. ET-57 shows clear efficacy with a 100 mg per kg dose, best near midsummer heel fly season, and no meat off flavors observed in tests.
Kirkwood breeder Rhoads sells the registered Guernsey bull Rhoadsacres Actor's Merit to Robert F. Mendenhall of Avondale Pennsylvania, as announced by the American Guernsey Cattle Club.
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