It only took a sprinkle of rain and up popped clumps of Honey Fungus (Armillaria mellea) all over the garden.
In woodland, this fungus serves the very useful purpose of breaking down the wood of dead trees and making space for new trees to take their place. However, in gardens, the fungus can spread to healthy trees and shrubs and kill them.
We get Honey Fungus in the garden most years but have not as yet had it spreading to healthy trees. I am not really sure what, if anything we should do about it. There is no easy way of getting rid of it.