Date of Award:

5-1-1956

Document Type:

Thesis

Degree Name:

Master of Science (MS)

Department:

Biology

Department name when degree awarded

Physiology

Committee Chair(s)

Thomas L. Bahler

Committee

Thomas L. Bahler

Committee

Delbert A. Greenwood

Committee

LeGrande Shupe

Committee

Eldon J. Gardner

Committee

Lorin E. Harris

Abstract

Since World War II there has been an increase in the number of new insecticides on the market. One group, the organic phosphate insecticides which were developed during the war by Schrader (2, 20), is effective in controlling plant-feeding insects (19). Soon after these new insecticides were introduced, reports indicated that residues remained on forage crops after harvest which could be directly harmful to animals consuming them, or indirectly to man. It has been shown by Biddulph et al. (5) and Sheppard et al. (31) that DDT residues appear in the milk of cows eating DDT treated alfalfa. Bryson et al. (45) demonstrated concentrations of DDT in the tissues and eggs of chickens. Summerford et al. (30) have reported cases of insecticide poisoning of humans in the application and use of Parathion. Realizing the dangers of residues of these hazardous insecticides appearing in foods that are to be eaten by man, the Miller bill (32), public law 518, was passed in 1954 to limit the residues that can appear in foodstuffs.

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