. !Fig. 31- Occurrence and estirrated percentages reduction in yield of 08,ts from crown rust, 1^20. Halo-blight caused by Bacterium coronafaciens Elliott = Pseudomcnas avenae Halo-blight of oats was reported from more states in 1^20 than m any previous year. The indications are that it occurs to some extent throughout the country oat that it is qu]te dependent on favorable conditions for vigorous development. The fact that the organism is seed borne would provide for its introduction generally. It was reported as' fairly common or general in Delav/are, Indiana, and

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. !Fig. 31- Occurrence and estirrated percentages reduction in yield of 08,ts from crown rust, 1^20. Halo-blight caused by Bacterium coronafaciens Elliott = Pseudomcnas avenae Halo-blight of oats was reported from more states in 1^20 than m any previous year. The indications are that it occurs to some extent throughout the country oat that it is qu]te dependent on favorable conditions for vigorous development. The fact that the organism is seed borne would provide for its introduction generally. It was reported as' fairly common or general in Delav/are, Indiana, and It also occurred in slight amounts in New York, Ohio, Illinois, Michigan, V/isconsin, North Dakota, South Dakota, Kansas, Idaho, and California. It was said to have caused some loss in Delaware but, according to reports, was of slight or no importance in the other states. In •Visconsin Vaughan states that mild infection'occurred vhen the plants were in

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Keywords: ., bookcentury1900, bookcollectionbiod, bookdecade1920, bookyear1921