Diseases and decays of Connecticut Diseases and decays of Connecticut tobacco diseasesdecaysof00ande Year: 1940 140 Connecticut Experiment Station Bulletin 432 DEAD-BLOSSOM LEAFSPOT 'TIead-blossom leafspot is primarily a disease of Shade tobacco—al- though occasionally seen on other kinds—because blossoms in great numbers are allowed to develop on Shade, while the tops and suckers are removed from the sun-grown types. When the flowers are mature, the corollas, or pink-colored paits, drop, and many of them, especially in wet weather, adhere to the gummy leaves and decay. As shown in Figure 27
Diseases and decays of Connecticut Diseases and decays of Connecticut tobacco diseasesdecaysof00ande Year: 1940 140 Connecticut Experiment Station Bulletin 432 DEAD-BLOSSOM LEAFSPOT 'TIead-blossom leafspot is primarily a disease of Shade tobacco—al- though occasionally seen on other kinds—because blossoms in great numbers are allowed to develop on Shade, while the tops and suckers are removed from the sun-grown types. When the flowers are mature, the corollas, or pink-colored paits, drop, and many of them, especially in wet weather, adhere to the gummy leaves and decay. As shown in Figure 27, the dead spot spreads in all directions from the decaying blossom as a center. The higher humidity under the tent also favors the development of the spots on this type of tobacco. Figure 27. Dead-blossom leafspot. Note the adherent, partly decayed blossom and dead leaf area about it. Symptoms. Spots are irregular and wavy— not angular—- in out- line, up to an inch or more in diameter, with a quite definite margin. In color they vary from light tan to reddish brown, while some are faded to ashen gray. Spots are usually bordered more or less by an indefinite, nar- row, fight yellow halo that fuses outward gradually into the normal green of the leaf. The dead tissue is brittle and breaks out easily. The dead blos- som remains tightly adherent to the center of the dead spot and usually becomes more or less blackened by masses of Alternaria spores. There may be one to a half-dozen spots on a leaf, thus rendering it worthless for wrap- per or binder.
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