Le malattie dei cereali e le malattie di foraggio di cereali e colture foraggere negli Stati Uniti nel 1921 diseasesofcereal21stak Anno: 1922 208 BiRLEr - Coperto granello di fuliggine coperto snut causato da Ustilago hordei (Pers.) K. & S. coperto granello di fuliggine di orzo si trovano praticamente ovunque Orzo è cresciuto anche se, durante l'anno passato che apparentemente non ha fatto molto danni. La maggiore riduzione di resa è segnalato dal Tennessee (4)- In Kentucky, secondo Valleau, la perdita era di circa 3; Pronme stimato che la resa maiale. 1. Distribuzione di orzo negli Stati Uniti. (Mappa preparato in ufficio di fattoria
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Diseases of cereal and forage Diseases of cereal and forage crops in the United States in 1921 diseasesofcereal21stak Year: 1922 208 BiRLEr - Covered smut Covered snut caused by Ustilago hordei (Pers.) K. & S. Covered smut of barley is found practically wherever barley is grown, although during the past year it apparently did not do very much damage. The greatest reduction in yield is reported from Tennessee (4)- In Kentucky, according to Valleau, the loss was about 3; Pronme estimated that the yield Pig. 1. Distribution of barley in the United States. (Map prepared in the Office of Farm Management.) in Virginia was reduced 2; and Taubenhaus estimated that the loss in Texas was about the same. The loss in Montana was also about 2, according to Jennison. The disease did not cause more than 1 loss in any other state from which reports were received and in most of than tiie loss v/as only a trace, although the percentage of reduction in some individual fields was high. The loss in Arkansas was placed at 5 'but practically no barley is grown in that state, according to Elliott. In Kansas, according to Melchers there was as much as 50 of smut in some fields, v/hile in Missouri 0 of the heads in some fields were affected, and in Indiana the highest percentage of smut in any individual field was I5. In Coahuila, Mexico, according to Christopher and Stalcman, smut was very general. The percentage of infected heads in various fields ranged from 5 to 20. For distribution and losses see the map, Pig. 5i2. The disease is controlled easily by ordinary seed treatment, including the modified hot v/ater treatment for loose aiiut.. The results of experiments to determine varietal resistance apparently were disappointing. The following comment from the Cereal Courier summarizes the work done at Arlington Farm, Virginia in I92I: The experiments for testing the behavior of varieties of barley tov/ard infection by the covered smut fungus were as usual unsuccessful. So far, practic
