Early in June, 1909, the yellow-leaf disease (H . gramineum) was prevalent in some fields of barley at Ames. It appeared just before heading of the grain, and destroyed .50 of one per cent of the barley.

This disease was first recorded* at Ames in 1890. It is characterized by longitudinal yellowish-green spots extending in parallel rows upon the leaves and sheaths. The yellowish-green areas are strongly contrasted to the green of the leaves. All the culms of a single stool are affected, and the diseased plants die prematurely. When the spots of the fungus begin to appear the plant ceases to grow and very little barley is produced. This species was referred to Helminthosporium gramineum because it seems to agree with the fungus described by Rabenhorst. It was later found to be somewhat widely disseminated in barley-growing regions. The character of the fungus and its injury to barley were later worked out by several investigators.



To view the content in your browser, please download Adobe Reader or, alternately,
you may Download the file to your hard drive.

NOTE: The latest versions of Adobe Reader do not support viewing PDF files within Firefox on Mac OS and if you are using a modern (Intel) Mac, there is no official plugin for viewing PDF files within the browser window.