Severe stem bleeding and frond fracture of MAWA hybrid coconuts in North Sumatra

Kartika D., . and Soebagyo F.X., . and Turner P.D., . and Breure C.J., . (1986) Severe stem bleeding and frond fracture of MAWA hybrid coconuts in North Sumatra. [Proceedings Paper]

In an NPK Mg fertiliser trial on Malayan Dwarf x West African Tall MAWA hybrid coconuts in Sumatra applications of both potassic and nitrogenous fertilisers were found to influence significantly stem bleeding disease. From leaf analysis over several years it was evident that the chlorine component of applied potassium chloride was the most important since no significant differences occurred in potassium levels in the different treatments. Disease incidence in the nil K plots exceeded 50 within nine years after field planting with the lowest incidence in the higher K treatments. Vegetative development and yield were also greatly reduced in affected palms. Both Ceratocystis paradoxa and Phoma leveilli were isolated from lesions deep inside stems but pathogenicity could not be demonstrated. Frond fracture is clearly related to chlorine deficiency but may not be directly associated with stem bleeding.

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Abstract

In an NPK Mg fertiliser trial on Malayan Dwarf x West African Tall MAWA hybrid coconuts in Sumatra applications of both potassic and nitrogenous fertilisers were found to influence significantly stem bleeding disease. From leaf analysis over several years it was evident that the chlorine component of applied potassium chloride was the most important since no significant differences occurred in potassium levels in the different treatments. Disease incidence in the nil K plots exceeded 50 within nine years after field planting with the lowest incidence in the higher K treatments. Vegetative development and yield were also greatly reduced in affected palms. Both Ceratocystis paradoxa and Phoma leveilli were isolated from lesions deep inside stems but pathogenicity could not be demonstrated. Frond fracture is clearly related to chlorine deficiency but may not be directly associated with stem bleeding.

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Item Type:	Proceedings Paper
Additional Information:	Available at Perpustakaan Sultan Abdul Samad Universiti Putra Malaysia 43400 UPM Serdang Selangor Malaysia. SB267 I61 1984 Call Number
AGROVOC Term:	Cocos nucifera
AGROVOC Term:	Stems
AGROVOC Term:	Hybrids
AGROVOC Term:	Coconuts
Geographical Term:	MALAYSIA
Depositing User:	Ms. Norfaezah Khomsan
Last Modified:	24 Apr 2025 05:25
URI:	http://webagris.upm.edu.my/id/eprint/14366

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