Diagnostic symptoms of root (wilt) disease of coconut
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Date
1972-05
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Abstract
Symptoms of the root .(wilt) disease of coconut {Cocas muffera L.) are complex and variable. Of the visual symptoms, Saccidity of leaves or ribbing of leaflets, yellowing of leaves and marginal necrosis of leaflets are frequently associated with the advanced stages of the disease. A comparative assessment of the importance of these foliar symptoms was made on over 7,000 pabns of varying age, growing under different soil conditions, Flaccidity or ribbing of leaflets was the common symptom. In a majority of young palms at an early stage of the disease, this appeared to be the .only symptom. Foliar yellowing and marginal necrosis were not typical of the disease but they set in with the advancement of age and disease, which ultimately completed the disease syndrome. Foliar yellowing was considered to be a delayed expression of nutrient deficiency. Marginal necrosis of leaflets was attributed to fungal infection.
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Indian J. agric. Sci. 42(5) :410-413, May 1972