. < Fig. 11.—Barley smuts: covered smut on left, loose smut on right. In loose smut, caused by U. nuclei, some of the young kernels are con- verted into black, loose masses of smutty powder which shake off, and leave the stalks bare. The spores which compose this powder blow about in the air and some of them lodge in the healthy flowers. Here the fungus grows into the very young kernels. Such kernels develop into normal- looking grains. If they are planted the next season, however, the smut fungus which is inside starts to grow as the seed germinates and spreads upward in the plant through
. < Fig. 11.—Barley smuts: covered smut on left, loose smut on right. In loose smut, caused by U. nuclei, some of the young kernels are con- verted into black, loose masses of smutty powder which shake off, and leave the stalks bare. The spores which compose this powder blow about in the air and some of them lodge in the healthy flowers. Here the fungus grows into the very young kernels. Such kernels develop into normal- looking grains. If they are planted the next season, however, the smut fungus which is inside starts to grow as the seed germinates and spreads upward in the plant through the stem and into the new flower and seed parts. Such flowers then produce masses of smut spores again instead of
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Photo credit: © The Bookworm Collection / Alamy / Afripics
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Keywords: ., book, bookcentury1900, bookleafnumber18, booksubjectplantdiseases
