. ?ig. 27. Occurrence of stripe rust, Puccinia ^lunarun> on cereals and grasses in the United States, as recorded in Ilorth American Flora 33^* 1':'20. Also recorded from the provinces of British Coluiribia and Alberta, and from I/exico. Scab (blight) caused by Gibberella saubinetii (I'ont^ ) Sacc "'heat scab, although it occurred over practically the same range as in 1^1^, was very markedly less severe in intensity throughout its range with a few local exceptions. In most of the states infection occurred on the heads rather generally but the percentage of affected heads was slight. Se
. ?ig. 27. Occurrence of stripe rust, Puccinia ^lunarun> on cereals and grasses in the United States, as recorded in Ilorth American Flora 33^* 1':'20. Also recorded from the provinces of British Coluiribia and Alberta, and from I/exico. Scab (blight) caused by Gibberella saubinetii (I'ont^ ) Sacc "'heat scab, although it occurred over practically the same range as in 1^1^, was very markedly less severe in intensity throughout its range with a few local exceptions. In most of the states infection occurred on the heads rather generally but the percentage of affected heads was slight. Seedling blights, ascribed to this fungus or'to Fusarium spp., were reported from Virginia, Delaware V/isconsin, IJorth Dakota, and Idaho. They were of minor importan-'e as a rule. The occurrence of the head olight, as well as the estimated pprcentage reduf-tiDn in yield for the different states is shown in the table and map. Losses for 1919 are also shown for comparison with, those of 1^20. It will be noted in the states in which the disease was epiphytoti^^ xn 1919 that the decrease in sever ity in 1^20 was very striking. This is true of all states with the exceotion of South Dakota where Evans estimates the loss in I92O as Yj^o as compared with lOfc in 1919, and for localities in Kansas and Nebraska.
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Keywords: ., bookcentury1900, bookcollectionbiod, bookdecade1920, bookyear1921
