TESTS FOR CHEMICAL INDUCTION OF MALE STERILITY IN SUGARBEET

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Abstract
We conducted four greenhouse and field experiments on the evaluation of 2-chloroethylphosphonic acid (Ethrel), estrone, dimethylarsinic acid, and 2,3-dichloroisobutyrate (FW-450) as male gametocides on sugarbeet (Beta vulgaris L.). Estrone induced a significant amount of pollen sterility in three genotype-treatment combinations, but the amount of emasculation was not sufficient or consistent enough to be of practical value. Dimethylarsinic acid had no gametocidal effect. FW-450 effected the greatest amount of pollen sterility, but was considered inadequate as a commercial gametocide. Ethrel induced varying amounts of pollen sterility, dependent upon genotype. At 200 ppm it was phytotoxic and reduced seed yield drastically. It is doubtful that Ethrel will be useful as a gametocide in sugarbeet.

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