Problems of Phytophthora bark canker on cocoa in Papua New Guinea

Prior C., . (1986) Problems of Phytophthora bark canker on cocoa in Papua New Guinea. [Proceedings Paper]

Canker black pod and chupon infections caused by Phytophthora palmivora were present on 13 of trees in a block of three and half year-old hybrid cocoa at Keravat Papua New Guinea an unusually high level of infection at this age. In these trees cankers arose most frequently from infected pods and chupons and in the jorquette. Cankers on both hybrid and Trinitario trees spread intermittently. Actively growing cankers produced sporangia in cracks in the bark providing a perennial on tree source of inoculum. Many naturally occurring cankers stopped growing and were sloughed off but some remained enlarged and eventually killed the cambium. Canker infections were cumulative and eventually lethal and treatment should begin when the trees were young

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Abstract

Canker black pod and chupon infections caused by Phytophthora palmivora were present on 13 of trees in a block of three and half year-old hybrid cocoa at Keravat Papua New Guinea an unusually high level of infection at this age. In these trees cankers arose most frequently from infected pods and chupons and in the jorquette. Cankers on both hybrid and Trinitario trees spread intermittently. Actively growing cankers produced sporangia in cracks in the bark providing a perennial on tree source of inoculum. Many naturally occurring cankers stopped growing and were sloughed off but some remained enlarged and eventually killed the cambium. Canker infections were cumulative and eventually lethal and treatment should begin when the trees were young

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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:	Theobroma cacao
AGROVOC Term:	Phytophthora
AGROVOC Term:	Cankers
Geographical Term:	MALAYSIA
Depositing User:	Ms. Norfaezah Khomsan
Last Modified:	24 Apr 2025 05:25
URI:	http://webagris.upm.edu.my/id/eprint/14022

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