Toxicity to House Fly Larvae of Droppings from Chicks Given Dipterex-Treated Water1

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Abstract
The effect of continuous administration via the water supply to chicks of Dipterex® 2,2,2-trichloro-1-hydroxyethyl-phosphonate) on the toxicity of the manure to house fly (Musca domestica L.) larvae was investigated. The hydrogen ion concentration of the water used in the Dipterex solutions influenced the toxicity of the manure. Water solutions at pH 8.0 resulted in a rapid decrease in toxicity to larvae. However, Dipterex at 30 p.p.m. in distilled or acidified water at pH levels below 7.0 caused high levels of larval mortality in the droppings. At this concentration, no adverse effect on weight-gain, water consumption, or feed conversion was noted in the chicks. It appears that the chick is able to metabolize Dipterex and excrete a highly larvicidal product but when conversion to DDVP occurs under alkaline conditions the metabolic pathway is different and results in products having low larvicidal activity.

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