Impact of root (wilt) disease on the yield of young coconut palms
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2007-02
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When young West Coast Tall palms under regular fertiliser management contracted the disease during the pre-bearing period, the onset of bearing was found to be delayed. While about 90 per cent of the healthy palms flowered by the end of the eighth year, it was only around 70 per cent in palms which contracted disease during the pre-bearing stage. About 18 per cent of these diseased palms did not flower even up to the thirteenth year. Decline in yield was faster in palms which became diseased in later years. In general, about 45 per cent decline in yield was observed in diseased palms, during the course of 10 years, compared to the yield of healthy palms, while in palms which were diseased during the initial years, this loss was to the extent of 68 per cent. In Dwarf x Tall palms though the occurrence of disease was at a slower rate the increase in the disease index was higher compared to that in WCT palms. The diseased Dwarf x Tall palms, in general were giving about 60 per cent lower yields, compared to the healthy palms.
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In : Advances in Coconut Research and Development 1993 (Eds.)MK Nair, HH Khan; P Gopalasundaram ; EVV Bhaskara Rao, Oxford & IBH Publishing Co. Pvt. New Delhi, 759 p(International symposium on Coconut Research and Development (ISOCRAD*II), 26-29 November 1991, CPCRI, Kasaragod) p.605-612