Everything I have seen is in agreement with this viewpoint. Apparently, a healthy mycorrhizal community is essential to prevention of fungus, bacterial, and chromista diseases in plants. Typically, woody plants require ectomycorrhizae while herbaceous plants require endomycorrhizae. Pot culture may prevent natural infection of mycorrhizae, but the inoculants are out there for sale. Even some diseases like Phytophthora, a chromista, that can attack above ground parts will not readily contaminate soil containing healthy mycorrhizae. I haven't seen evidence that introducing mycorrhizae after soil infection will eliminate it but that wouldn't be expected since mycorrhizae have very little vigor when not acting as an extension of healthy plants' root systems. Tim -----Original Message----- From: pbs [mailto:pbs-bounces@lists.ibiblio.org] On Behalf Of Mark BROWN Sent: Wednesday, April 29, 2015 3:24 AM To: Pacific Bulb Society Subject: Re: [pbs] How to deal with Stagnospora The use of beneficial mycorhizal fungi such as Trichoderma harzianum is now considered the best way of treating Stagonospora. David Way wrote an excellent piece about treating fungal problems on galanthus in the AGS bulletin. Not one chemical was endorsed. Chemicals are not to be considered any longer with all the environmental and health risks involved. Bees are dying in their millions and upto 80% of our food crops are threatened by phytochemicals destroying these pollinators. The PBS should now endorse a more environmental philosophy I think... There are plenty of environmentally acceptable methods of gardening without using such toxic substances. And many of these products are now banned or under scrutiny. And we all garden for pleasure not for profit. Kind regards, Mark