. Fig. 18.—Mosaic disease on wheat. Infection of the wheat plant by a virus results in a mottling of the leaves, which is the most striking symptom of the disease. to run parallel with the length of the leaf. In some cases of green mosaic there is so much light green color in the leaf that it looks as though it is mottled with dark green. Mottling, com- monly called the mosaic pattern, may be found on the sheath and chaff as well as on the leaf blade. The disease causes a distinct stunting of plants in addition to mottling of the leaves.

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Keywords: ., bookcentury1900, bookcolle, bookpublisherurbana, booksubjectgrain