Hypholoma fasciculare has been developed as a cultural control agent for Armillaria root disease. Many trials to assess the efficacy of this treatment have been installed over the southern interior of BC. Based on early published findings, Hypholoma fasciculare will be registered as a microbial pest control agent. The established trials must still be monitored to assess the long-term efficacy of the treatment. In addition, several of the trials incorporate modifications of the standard treatment and these must also be monitored to determine if they have altered the efficacy of the basic treatment. Armillaria root is disease is one of the most common disease problems in Southern and coastal British Columbia. It affects almost every commercially valuable tree species and can have significant effects on productivity.