Epidemiological studies on inflorescence dieback of arecanut caused by Colletotrichum gloeosporioides
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Date
2007-02-08
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Abstract
The inflorescence dieback of areca palm occurs mainly during the months of March - May. Areca inflorescences immediately after shedding of male flowers are highly susceptible to the disease. The infection usually starts from the tip of inflorescences and spreads towards the base leading to shedding of female flowers. The scars left by the male flowers at the time of shedding and the dew water deposits during night are believed to be the favourable factors for the germination, penetration and infection by the fungus on the rachille of inflorescences. It has been observed that the areca fruits which are resistant when green become susceptible when they ripen. The epidemiological studies have shown that the incidence of the disease becomes higher and higher during February-March, reaches a peak during April-May and subsequently becomes insignificant during July-January. The high relative humidity (86-99%) and low temperature (18-29°c) in the early hours of the morning (2.00 hr to 8.00 hr) followed by high temperature (28-34. 5°c) and low ft H (30-70yo) in the afternoon (12.00 hr to 16.00 hr) and the availability of inflorescences of the susceptible stage appear to favour disease development during March-May. The relationship between per cent inflorescence produced and disease incidence was found to be highly significant (r=0. 65**).
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In:Proceedings, Silver Jubilee Symposium on Arecanut Research and Development, CPCRI(RS), Vittal, 13-14 Dec. 1982. Edited by K. Shama Bhat and C. P. RadhakrishnanNair 1985 p-116-119