Diseases of economic plants (1921) Diseases of economic plants diseasesofecon00stev Year: 1921 284 Diseases of Economic Plants as early as 1760. The disease may attack any part of the plant at any age, — leaves, stalks, aerial roots, ears, tas- sels, — provided only that they be still in tender growing condition, not mature and hard. The first s>nnptom is a pale, glistening, swollen area covered with a white mem- brane, which soon ap- pears black owing to matured spores within. The mem- I3 r a n e eventually bursts, loosening a powdery, dry, black m ass of spores through which fibrous vei
Diseases of economic plants (1921) Diseases of economic plants diseasesofecon00stev Year: 1921 284 Diseases of Economic Plants as early as 1760. The disease may attack any part of the plant at any age, — leaves, stalks, aerial roots, ears, tas- sels, — provided only that they be still in tender growing condition, not mature and hard. The first s>nnptom is a pale, glistening, swollen area covered with a white mem- brane, which soon ap- pears black owing to matured spores within. The mem- I3 r a n e eventually bursts, loosening a powdery, dry, black m ass of spores through which fibrous veins of the corn plant still penetrate. It has ])een conclu- sively demonstrated that the causal fungus is not conveyed to the new crop in the seed, as is the case with so many other smuts, and that there- fore no form of seed treatment is of value for its prevention. It has been clearly shown that infection is produced by the spores which, under suitable conditions of moisture, fall upon any tender part of the corn plant. The silks furnish the requisite conditions, and it is through them that ear infection occurs. The Fig. 148. — Corn smut upon the ear. Original.
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