. Diseases of wheat, oats, barley, and rye. Grain. BOEWE: DISEASES OF WHEAT, OATS, BARLEY, AND RYE 97 certain years to as high as 10 per cent in others. Field counts of the two smuts made in representative fields in a 25-year period, beginning with 1930, show an average annual prevalence of 2 per cent. Appearance.—True loose smut of barley, fig. 33, is caused by Ustilago nuda. It first becomes evident as a head emerges from the boot; emergence of the head may occur slightly earlier in. Fig. 33.—Loose smut of barley. Spikelets of the heads on infected plants are transformed to masses of olive-b
. Diseases of wheat, oats, barley, and rye. Grain. BOEWE: DISEASES OF WHEAT, OATS, BARLEY, AND RYE 97 certain years to as high as 10 per cent in others. Field counts of the two smuts made in representative fields in a 25-year period, beginning with 1930, show an average annual prevalence of 2 per cent. Appearance.—True loose smut of barley, fig. 33, is caused by Ustilago nuda. It first becomes evident as a head emerges from the boot; emergence of the head may occur slightly earlier in. Fig. 33.—Loose smut of barley. Spikelets of the heads on infected plants are transformed to masses of olive-black powder, which shatters off, leaving only the bare head-stem, as shown at the right. The head at the left appears healthy and normal. diseased than in healthy plants. The normal chaff and rudi- mentary grain of a diseased head is replaced by a mass of medium brown to dark brown, powdery spores. The spores are enclosed for a time in a delicate, silvery membrane, which soon ruptures. Diseased heads stand erect above healthy heads. The membrane about the spores ruptures and releases the spores by the time healthy heads are in bloom, and by harvest a naked spike is all that remains of a diseased Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Boewe, Gideon Herman, 1895-. [Urbana]
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Keywords: ., bookcentury1900, bookcolle, bookpublisherurbana, booksubjectgrain
