Armillaria Root Rot In The Canadian Prairie Provinces

The major forest tree diseases of the Canadian prairie provinces are described in terms of their cause, distribution and hosts, symptoms and signs, disease cycle, damage, and control. The 25 coniferous, 15 deciduous, and 6 noninfectious disorders are illustrated by 47 pages of colour photographs. An appendix listing the diseases by host, a glossary of technical terms, and a general index listing the common and scientific names of the hosts and the scientific names of the pathogens are also included.

Forest pest conditions in Alberta, Saskatchewan, Manitoba, and the Northwest Territories during 1987 are summarized, and some predictions of infestation status are given for 1988. Eight major pests are discussed, and additional noteworthy insects, diseases, and other tree damage agents are reported in a table. Results of surveys for acid rain symptoms, pests and damage incidence in nurseries and plantations, and climatic injury to trees are also reported.

This guide provides information in a simplified form, compiled from various sources, on root rots caused by fungi. It begins with an overview of root rot and its significance as a cause of tree harvesting losses. It also explains the role of root rot in the forest and the types of decay found in roots. The guide then describes the most important root rots found in Ontario, their range throughout the province, the identification and symptoms of root rot, how the rot spreads, and the types of damage caused. Other topics covered include tree damage as a means of entry of root rot; intensive forest management and root rot; control of root rot; and new research being conducted into root rot control.