. Fig. 38.—Spot blotch on barley. This disease appears on the upper leaves about heading time as dark brown spots of various sizes and shapes and with definite margins. The dead or oldest area of each spot has an olivaceous cast, the result of the fruiting of the fungus. Infection may occur on the sheaths. The disease starts on the old leaves and spreads to the younger ones. Spot blotch lesions never have the netted appearance characteristic of the net blotch dis- ease. Heads as well as leaves may become infected. Dark brown spots appear on the glumes, especially at their bases and at the germ
. Fig. 38.—Spot blotch on barley. This disease appears on the upper leaves about heading time as dark brown spots of various sizes and shapes and with definite margins. The dead or oldest area of each spot has an olivaceous cast, the result of the fruiting of the fungus. Infection may occur on the sheaths. The disease starts on the old leaves and spreads to the younger ones. Spot blotch lesions never have the netted appearance characteristic of the net blotch dis- ease. Heads as well as leaves may become infected. Dark brown spots appear on the glumes, especially at their bases and at the germ ends of the kernels. The "black point" at the germ end of a kernel is characteristic of the disease. As crown rot, the disease develops at or near the ground line. Crown roots may be rotted and tillers killed. The crown tissues
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Keywords: ., bookcentury1900, bookcolle, bookpublisherurbana, booksubjectgrain
