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FPL 60 - Phomopsis (Diaporthe) Canker

The information accessed from this screen is based on the publication: Funk, A. 1986. Phomopsis (Diaporthe) canker of Douglas-fir in British Columbia. Forestry Canada, Forest Insect and Disease Survey, Forest Pest Leaflet No. 60 3p

Introduction

Phomopsis (Diaporthe) canker of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) is caused by the fungus Diaporthe lokoyae Funk (Ascomycetes). It is referred to as Phomopsis canker because the asexual stage of the fungus, Phomopsis lokoyae Hahn (5), was found much earlier than the Diaporthe or sexual stage (4). The disease is troublesome in young plantations and in natural regeneration, especially following drought conditions in the growing period (2).

The disease occurs on the west coast of North America from British Columbia to California. Records in British Columbia are chiefly from southern Vancouver Island and the lower mainland (1). Diaporthe causes stem cankers, leader and branch dieback in trees from seedling to pole size.

For more information, see the Phomopsis (Diaporthe) Canker Forest Pest Leaflet in the Canadian Forest Service bookstore.