Diseases of cereal and forage Diseases of cereal and forage crops in the United States in 1921 diseasesofcereal21stak Year: 1922 OATS - Smuts 215 Powdery rrdldev/ caused by Erysiphe graminis DC. - reported to te very prevalent in Nev; York where, on account of the early warm spring, the damage reached 1., according to Kirby; cird was reported once in Oregon, in a moist draw in a field at I'oro. Leaf spoi. cdused by Septoria passerinii Sacc . This has been reported from V.'isconsin. (V.'eber, George F. Studies on Septoria diseases of cereals and certain grasses. (Abstract). Phytopath. 12: 44.
Diseases of cereal and forage Diseases of cereal and forage crops in the United States in 1921 diseasesofcereal21stak Year: 1922 OATS - Smuts 215 Powdery rrdldev/ caused by Erysiphe graminis DC. - reported to te very prevalent in Nev; York where, on account of the early warm spring, the damage reached 1., according to Kirby; cird was reported once in Oregon, in a moist draw in a field at I'oro. Leaf spoi. cdused by Septoria passerinii Sacc . This has been reported from V.'isconsin. (V.'eber, George F. Studies on Septoria diseases of cereals and certain grasses. (Abstract). Phytopath. 12: 44. Jan- 1922.) Ergot caused by Clayiceps purpurea (Pr.) Tul. Ergot of barley was found in V.'isconsin, Iowa, Minnesota, North Dakota, ard Montana. While it v/as present in several fields in of these states, it was not found in amounts sufficient to te of economic importance. Scab, caused by C-ibberella saubinetii (Mont.) Sacc, was observed in Illinois, V.'i scon sin, Iowa, Minnesota. In Minnesota the disease was fairly widespread, but did not cause any appreciable damage. The head blight is fairly common on barley, but it very seldom reduces the yield. OATS i Pig. 54- Distribution of oats in the United States. (Map prepared in the Office of Farm Maniigement.) Smuts caused by Ustilago avenae (Pers.) Jens. a. U. levis (K. C: S.) Mag. It is quite evident that the two smuts of oats, v/hich are not separated in the survey, still do a great deal of damage in spite of extension campaigns for seed treatment. The map, Fig. 55» shows the distribution and percentage of reduction in yield due to oat smuts. The greatest losses apparently occurred in Texas and Arkansas. In both of these states it is estinated that the yield v;as reduced by 10 or more on account of smut. In Kentucky the yield, according to Valleau, was ieduced by 8. According to Ludwig, 'J is estimated as the reduction in yield for South Carolina; G in Oklahoma according to Stratton; and
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