. Diseases and decays of Connecticut tobacco. Tobacco. 142 Connecticut Experiment Station Bulletin 432 outline, of indefinite margins, one-eighth to one-quarter of an inch in diam- eter, mostly separate but sometimes, when numerous on a leaf, coalescing to form irregular blotches. The color of the spots is olivaceous to olivaceous- brown on the green leaves and a more distinct chestnut brown on the yellow background. As may be seen in Figure 28, the centers of the older spots are often lighter in color. Blotch differs from all the other typical leafspots of tobacco in that the spot is visible
. Diseases and decays of Connecticut tobacco. Tobacco. 142 Connecticut Experiment Station Bulletin 432 outline, of indefinite margins, one-eighth to one-quarter of an inch in diam- eter, mostly separate but sometimes, when numerous on a leaf, coalescing to form irregular blotches. The color of the spots is olivaceous to olivaceous- brown on the green leaves and a more distinct chestnut brown on the yellow background. As may be seen in Figure 28, the centers of the older spots are often lighter in color. Blotch differs from all the other typical leafspots of tobacco in that the spot is visible only on the upper surface of the leaf. Only in very advanced stages does the underlying leaf tissue die so that spots may be seen from. Figure 28. Leaf blotch. Natural size at left and one-quarter natural size at right. below. On account of this distinction, the names "blotch" or "scab" seem more appropriate than "leafspot". The'appearance of the disease im- mediately recalls that of various scab diseases, such as those of fruit trees. The actual damage caused by the disease is not great since only the smaller bottom leaves, mostly "sand leaves", are affected, and in curing, the blotches become less distinct on a brown background. Moreover, it probably never occurs except during exceptionally wet years, such as the 1938 season, or in very wet parts of the field. In other states, but not here, blotch is reported as a seedbed trouble where it may exhibit a variety of symptoms ranging from a slight browning or girdling of the stem to damping-off and wet rot in severe Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Anderson, P. J. (Paul Johnson), b. 1884. [New Haven] : Connecticut Agricultural Experiment Station
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