Diseases of economic plants (1910) Diseases of economic plants diseasesofeconom00stev Year: 1910 264 DISEASES OF ECONOMIC PLANTS spots generally show first near the tip or margin, probably because surface water remains longer on these parts. The diseased area soon dies and blackens. It may temporarily dry out and curl up if the progress of the fungus is checked by drought, or it may, in rainy weather, rap- FlG. 119. —Potato late Kows at Ictt with Bordeaux mixture and Paris green ; rows at right received Paris green only. Original. idly proceed to transform the entire foli
Diseases of economic plants (1910) Diseases of economic plants diseasesofeconom00stev Year: 1910 264 DISEASES OF ECONOMIC PLANTS spots generally show first near the tip or margin, probably because surface water remains longer on these parts. The diseased area soon dies and blackens. It may temporarily dry out and curl up if the progress of the fungus is checked by drought, or it may, in rainy weather, rap- FlG. 119. —Potato late Kows at Ictt with Bordeaux mixture and Paris green ; rows at right received Paris green only. Original. idly proceed to transform the entire foliage into a moist, putrid mass. In the earlier stage the blackened part is bordered by a narrow region of light green, characterized by a slightly watery, flaccid appearance. Under con- ditions of especially humid atmosphere a fine, white down may be seen upon the more recently invaded parts. This affection of the leaves is accompanied by an offensive odor
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