The present military emergency threatens the supply of copper and mercury for fungicidal use. Copper carbonate and organic mercury compounds, notably ethyl mercuric phosphate, are the active ingredients of standard dust fungicides used in treating sorghum seed for protection of the germinating seed from soil and seedborne, seed-rotting fungi and for covered smut control.(2,4). In the event of enforced restriction of manufacture and sale of copper and mercuric fungicidal materials, two alternatives may confront the grower who nevertheless wishes to treat his sorghum seed. They are: reduce the dosage of copper or mercury, or, use a substitute material which is available. Chloranil and sulfur have been suggested as such substitute materials (1,3). The effectiveness of both for smut control is established (2,3).
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South Dakota State College
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Buckhholtz, W.F., "A Comparision of Dosages of Copper Carbonate and Ethyl Mercuric Phosphate with Chloranil and Sulfur as Sorghum Seed Treatments" (1942). Agricultural Experiment Station Plant Pathology Pamphlets (1942-1962). 5.