Forest Investment Account

Abstract of FIA Project Y051143

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Evaluation of Hypholoma trials

Author(s): Chapman, Bill
Imprint: Victoria, B.C. : Ministry of Forests, 2005
Subject: Forest Investment Account (FIA), Armillaria, Control
Series: Forest Investment Account (FIA) - Forest Science Program


Inoculation of stumps with Hypholoma fasciculare has shown promise in other trials for control of Armillaria root disease. In order for it to be used operationally, the treatment must be registered as a Microbial Pest Control Agent (MPCA) with the Pest Management Regulatory Agency (PMRA). Part of the requirement for registration is to provide data on ways in which the MPCA could be expected to interact with the environment and people who might contact it. Two tests were chosen help characterize the agent, these were Acute Oral Toxicity and Earthworm Feeding. The rats in the Acute Oral Toxicity Test all survived. In the earthworm-feeding test, the worms did not die in the Hypholoma treatment and continued to reproduce, though worms were smaller. There is good indication that the small size of the earthworms was due to the form in which the fungus was delivered and a longer-term study with different delivery system is planned. Three trials were assessed in 2004 for incidence of root disease. Two of the trials received only a preliminary assessment which indicated there was insufficient incidence of Armillaria caused mortality to proceed with a more detailed assessment. The third trial was assessed using high resolution aerial photography. The method looks promising and we will be ground truthing the method this spring to verify the results.

For further information, please contact Bill Chapman, BC Ministry of Forests (

Updated September 08, 2005 

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