. Kig. 6.—Speckled leaf blotch of wheat. The presence of the fungus is indicated by the many black dots in the blotched regions. usually where the blade is attached to the sheath, killing it at that point and causing the death of all the outward part of the leaf. Very little new infection occurs after flowering time of the grain. Speckled leaf blotch occasionally attacks the tips of glumes and produces spots similar to those caused by glume blotch, except that the color is darker and the discoloration ends in streaks along the main veins. In some years speckled leaf blotch kills most of the ro
. Kig. 6.—Speckled leaf blotch of wheat. The presence of the fungus is indicated by the many black dots in the blotched regions. usually where the blade is attached to the sheath, killing it at that point and causing the death of all the outward part of the leaf. Very little new infection occurs after flowering time of the grain. Speckled leaf blotch occasionally attacks the tips of glumes and produces spots similar to those caused by glume blotch, except that the color is darker and the discoloration ends in streaks along the main veins. In some years speckled leaf blotch kills most of the rosette leaves and as many as 50 per cent of the tillers. This damage is often confused with winter injury. Small, black fruiting bodies over a large part of the area of dead rosette leaves and dead tillers indicate presence of the disease. Life History.—After the wheat crop is mature and har- vested, the speckled leaf blotch fungus lives through the sum- mer on volunteer wheat, emmer, and .spelt, as well as in leaf fragments from the wheat crop. Spores shed from infected
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Keywords: ., bookcentury1900, bookcolle, bookpublisherurbana, booksubjectgrain
