Date of Award:

5-1961

Document Type:

Thesis

Degree Name:

Master of Science (MS)

Department:

Plants, Soils, and Climate

Department name when degree awarded

Agronomy

Committee Chair(s)

Marion E. Pederson

Committee

Marion W. Pedersen

Abstract

The widespread use of chemicals for the control of diseases, insects, and weeds in the production of alfalfa seed has caused concern with regards to what effect these materials may have on the inherent reproductive potential of the plants. It has been reported that captan (N-(trichloromethylthio)-4-cyclohexene-1,2-dicarboximide) has both a morphological and physiological effect on some plants. The action of this chemical with regards to alfalfa reproduction has not been reported. Demeton (0,0-diethyl 0(and S)-2-(ethylthio) ethylphosphorodithioate) is another chemical used in alfalfa seed production for which the direct effects on reproduction have not been studied. Adverse effects have been reported on a number of plant species with the use of organic phosphate insecticides. A selective herbicide, 4(2,4-DB), (2,4-dichlorophenoxy-batyric acid) shows promise of being satisfactory for the control of broad-leaf weeds in alfalfa. Work reported on studies of forage and seed yields is quite varied as to the effect of 4(2,4-DB) on alfalfa.

It is the object of this study to determine, in a preliminary way, the effects of captan, demeton, and 4(2,4-DB) on the growth, pollen and ovule fertility, and seed and chaff yields of alfalfa.

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