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There are many diseases that infect cotton, and common prevention methods include modification of farming practices and control of vectors of disease (most often aphids and whiteflies).
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A plant suffering from bacterial blightFrom: Cotton diseases |
Boll rot due to a fungal infection.From: Cotton Diseases |
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Potassium deficiency can cause changes in leaf color and shape. This can be seen in older leaves first, late in the growing season.
(From: Integrated Pest Management for Cotton in the Western Region of the United States) |
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Leaves turn to a yellow or red color due to mite damage. Severe damage causes the leaves to die. From: Cotton Insects and Mites:Characterization and Management" |
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Some links for further information on cotton diseases and pests.
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Introduction | Flowers&Fruit | Roots | Stems | Leaves Section of Plant Biology Division of Biological Sciences UNIVERSITY OF CALIFORNIA, DAVIS |