. Fig. 142. —Young ear of corn inoculated in the silk with diplodia. After Burrill & Barrett. affected ear are shrunken, loosely at- tached, light in weight, and darker in color and more brittle than those of a healthy ear. Upon breaking open an ear, very small black pycnidia may be seen embedded in the white masses of myceKum, especially at the bases of the kernels. Diseased ears left in the field may develop these pycnidia in such abundance as to make the grains l)lack. Much of the food value of the corn is lost, owing to the consumption of starch within the grain, as well as to the prev
. Fig. 142. —Young ear of corn inoculated in the silk with diplodia. After Burrill & Barrett. affected ear are shrunken, loosely at- tached, light in weight, and darker in color and more brittle than those of a healthy ear. Upon breaking open an ear, very small black pycnidia may be seen embedded in the white masses of myceKum, especially at the bases of the kernels. Diseased ears left in the field may develop these pycnidia in such abundance as to make the grains l)lack. Much of the food value of the corn is lost, owing to the consumption of starch within the grain, as well as to the prevention of starch storage. The germinating power of the grain is also lost. Upon the stalks the fungus first appears as very small dark specks under the rind, near the nodes, and at broken places, usually in over- wintered stalks. Stalks nearly three years old have been found bearing pycnidia. Although the green stalks are not naturally susceptible, the shanks are particularly so. The causal fungus gains entrance to the ears from infected stalks which bear them, and these are infected from the soil' through the roots. Ears are also infected through the silks by wind-
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Keywords: ., bookauthorstevensf, bookcentury1900, bookdecade1910, bookyear1910
