. Figure 5. A bedrot spot caused by the fungus Pythium aphanidermatum. sash are removed. Soon afterwards the plants collapse in a wet rot and the decaying leaves and stalks sink to a flat black crust over the surface of the ground. Under moist conditions the affected patches spread rapidly in a centrifugal diiection until they may be several feet in diameter and, in the worst cases, entire beds are destroyed. A closer examination of the individual plants shows that the bases of the stalks are first attacked by a soft, slimy, dark, wet rot which advances up to the bases of the leaves. These dro
. Figure 5. A bedrot spot caused by the fungus Pythium aphanidermatum. sash are removed. Soon afterwards the plants collapse in a wet rot and the decaying leaves and stalks sink to a flat black crust over the surface of the ground. Under moist conditions the affected patches spread rapidly in a centrifugal diiection until they may be several feet in diameter and, in the worst cases, entire beds are destroyed. A closer examination of the individual plants shows that the bases of the stalks are first attacked by a soft, slimy, dark, wet rot which advances up to the bases of the leaves. These droop and become dark green and " watersoaked as they collapse. As they come into contact with other leaves, the rot spreads from leaf to leaf, runs down the leaf petiole to the stalk and thus spreads from plant to plant. Sprinkling the plants with water also - spreads the germs over the soil so that leaves in contact with the ground serve as agents for conducting the disease to the stalk or to the next plant. The original infection may thus occur either through the leaf or through the stalk.
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Keywords: ., bookcentury1900, bookpublishernewhavenconnec, booksubjecttobacco
