Diseases of small grain crops Diseases of small grain crops in Illinois diseasesofsmallg35boew Year: 1939 BOEWE: DISEASES OF SMALL OR AIX CHOI'S 123 bushel. Copper carbonate especially prepared for seed treatment should be used. The finer it is ground the better disinfectant it is. The size of the dust particles is almost as important as the copper content of the chemical. To be effective, the dust must be Fig. 46.—Oil drum mixer, for treating seed grain with copper carbonate and other dusts. (Photograph furnished by the author.) fine enough to pass through a 200-mesh screen, but dust fin
Diseases of small grain crops Diseases of small grain crops in Illinois diseasesofsmallg35boew Year: 1939 BOEWE: DISEASES OF SMALL OR AIX CHOI'S 123 bushel. Copper carbonate especially prepared for seed treatment should be used. The finer it is ground the better disinfectant it is. The size of the dust particles is almost as important as the copper content of the chemical. To be effective, the dust must be Fig. 46.—Oil drum mixer, for treating seed grain with copper carbonate and other dusts. (Photograph furnished by the author.) fine enough to pass through a 200-mesh screen, but dust fine enough to pass through a 300-mesh screen is better. A mechanical mixing machine must be used for copper car- bonate, since each kernel must be coated thoroughly. The shovel method of mixing is not efficient enough for this dust. An oil drum, a commercial treating machine or a concrete mixer can be used. Formaldehyde Treatments.—Formaldehyde, a gaseous dis- infectant, has been used since 1897 for seed-borne diseases. It has proved especially effective in controlling the oats smuts. It is not effective, however, in controlling such diseases as barley stripe and loose smut of wheat. For seed treatment, formaldehyde is now available as forma- lin, which is a liquid containing from 37 to 40 per cent of dissolved formaldehyde gas, and also as formaldehyde dusts. These dusts,
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