Cultivating a garden each year is like taking a botany course with updates. Each year you learn something new. Every time you think that you've 'learned' what it takes to make plants happy, you find out (often the hard way) that you haven't. Sometimes you find out too that even if you've done everything in your power to keep your plants healthy and happy, it's not enough. There is evil lurking in the garden too, in the form of destructive pathogens that are just waiting to pounce when the time is right. I am learning that now. A pathogen called honey fungus has shown up in my garden, and has infected two plants--a blackberry bush and a rose bush. It's an insidious little underground creeper, as it sends out reddish-brown to black rhizomorphs that look like “bootlaces”. It spreads underground (up to three feet per year) infecting the root systems of susceptible trees and eventually killing them. It can also spread via spores. There is no chemical that can kill this fungus, and at present it is the most destructive fungal disease in gardens in the United Kingdom, according to my online research.
One way to deal with this fungus is to completely dig out the stumps and roots of the infected tree(s). These should be removed from the infected area and destroyed. I have already done this with the blackberry bush, and will do the same with the rose bush come spring. They were very close to each other, no more than a couple of feet apart. I plan on letting the area where the infected trees have been, lie fallow for a year as well as on turning the soil in order to get rid of any rhizomorphs that may turn up. I had hoped to plant a new tree in this area, but this will have to wait a few years. I will have to move the birdbath to another area of the garden, since emptying the birdbath each day kept part of the area wet. But apparently plants get stressed by warm dry summers, and this makes them susceptible to attack. This past summer was warm and dry, at least in July and August. But June was rainy, as was September--very rainy. I would have thought that fungal infections would thrive in moist areas. Perhaps they do, after the plants have been weakened by too much warmth and dryness.
There are many good garden sites online, the majority of them in the United Kingdom and the USA. I'm glad they exist, because you can get the advice and help you need very quickly. That helps me make the decisions I need to make. Some decisions need to be made immediately, like the decision to remove the blackberry bush and to cut down the rose bush to a stump. I'm hoping to stem the spread by doing this, because once winter comes, the fungus will die. But if it has spread widely underground, it will be a problem again come spring.
