The relative effectiveness of coumaphos as a poultry feed additive to control synanthropic fly larvae in manure.

Abstract

Coumaphos was fed at 0, 20, 33, 40, and 60 ppm in poultry rations to White Leghorn layers during 2 fly-control field trials in 1964 and 1965. Adult fly emergence from insect-caged treated manure samples showed poor control of the little house fly, Fannia canicularis (L.), and the false stable fly, Muscina stabulans (Fallen); from 50 to 84% control of the coastal fly, F. femoralis Stein; from 84 to 99% control of the black garbage fly, Ophyra leucostmla (Weidemann), and only 43% control with the house fly, Musca domestica L. Infectious coryza in all birds on the 1964 test, drug treatment, and the low daily bird intake of coumaphos were responsible for depressed egg production; depression of egg production occurred with hens fed 60 ppm in 1965.