Pineapple in Tobacco *
Pitting in tobacco is a physiological disease caused by the oxidation of chlorogenic acid accumulated around the leaf veins, which lose their moisture later during the slow yellowing and drying of tobacco leaves. The differences between the colors of the stains vary according to the degree of oxidation of chlorogenic acid.
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The symptom of the disease in the field is initially as small dark spots on the plants. Over time, the dots coalesce, causing small lines to form.
In the drying place, the colors of the spots on the leaves become darker and appear in different colors from greenish to various shades of brown. As a result of non-ideal drying conditions, thin lines appear on the lower ends of the leaves, between the veins, darker than normal yellowing leaves and zigzagging each other, 4 days after the tobacco strings are hung. At the same time, irregular spots also appear. Sometimes the lines are thickened and the dots become larger, displaying an appearance that overlaps with each other.
Although the stains do not completely kill the leaf in the field, they affect the quality to a great extent. During drying, it causes great economic damage by directly affecting the quality.
These symptoms can be seen in all areas of tobacco production.
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Cultural Measures
The most important measure to reduce the occurrence of double piebald is to break the leaves without disturbing the normal condition in the plant and to dry the broken leaves by regularly losing water.
According to this situation:
-Crimea should be done early in the morning.
-Leaves should not be tightly strung on the ropes.
-Large tobacco leaves should be dried in the sun to ensure ideal ventilation.
Chemical Control
There is no chemical control of this disease.
*Ministry of Agriculture, Agricultural Protection Technical Instructions Vol:2