. Diseases and decays of Connecticut tobacco. Tobacco. Decays and Disorders During Curing 147 the stalk. Lack of air circulation and the greater quantity of water trans- pired from the green stalk and the crowded leaves create a very moist at- mosphere for the inner leaves and such conditions favor the development of pole rot. It is here, rather than on the outside leaves, that the trouble is found first. Even where charcoal firing is resorted to, it is difficult to dry out the leaves in such places and an insufficient firing is apt to make condi- tions more favorable to rot because the temper
. Diseases and decays of Connecticut tobacco. Tobacco. Decays and Disorders During Curing 147 the stalk. Lack of air circulation and the greater quantity of water trans- pired from the green stalk and the crowded leaves create a very moist at- mosphere for the inner leaves and such conditions favor the development of pole rot. It is here, rather than on the outside leaves, that the trouble is found first. Even where charcoal firing is resorted to, it is difficult to dry out the leaves in such places and an insufficient firing is apt to make condi- tions more favorable to rot because the temperature is raised but the sur- faces are not dried. The primed leaves of Shade tobacco are better distri- buted and there are no green stalks to furnish a continuous supply of mois- ture. Therefore pole rot is not so common in Shade tobacco as in the stalk- cut tA^e. As a rule also, Shade tobacco is more carefully fired during the cure. There is considerable and often confusing vai'iation in the symptoms exliibited, depending on the part of the leaf attacked, severity of infection, time of infection and location of the leaf with respect to the other Figure 31. Freckle rot on cured leaf. For convenience in discussion we may distinguish three types of pole rot: (1) Freckle rot, (2) web rot and (3) vein rot. One, two or all of these may be present on the same leaf and they may intergrade into each other. Freckle rot has usually been considered the initial stage of the disease, but this is not universally true since the other symptoms may appear first. Small dark specks, from pinhead size up to a quarter of an inch in diameter, appear on the blade of the leaf. They resemble in size, shape, dis- tribution, and often in color, the freckles on a red-headed urchin's face. On fight leaves they ai'e deep, reddish brown, while on dark, heavy leaves they are almost black. When the leaf is held up to a strong light, the spots appear translucent. There is no fungous growth on the surf
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