This station has fora number of years conducted some experiments in treating these troublesome diseases. Experiments have also been made elsewhere with some of these diseases. Galloway,3 Goff4 and others have shown that these diseases may be treated successfully with fungicides. The experiments reported in Bulletin 17 of Iowa Agricultural Experiment Station show some excellent results in treating with ammoniacal carbonate of copper and Bordeaux mixture. It is always well however to repeat experiments as far as it is possible to do so, because the conditions affecting these diseases differ. In 1892 the season was a comparatively dry one, 1893 was however wet during the months of May and June, raining every few days. The ammoniacal carbonate of copper was less efficacious than the Bordeaux mixture under such conditions. Largely because the fungicide did not adhere as well to the foliage.



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