Search 'botrytis' or 'botrytis control' in the search box at the top right of the home page of this forum. Here's one of many threads that come up containing something on botrytis.
The thread "Am I doing the right thing?" in
Lilies forum
Whenever you have a early, mild spring, It's a good idea to spray the ground with a good copper base fungicide just before the 'noses' pop up. After the plants are up a few inches, apply a layer of summer mulch to prevent the soil and botrytis spores from splashing onto the leaves. Thereafter, individual plants that get botrytis from airborne spores can be treated individually by spraying with fungicide, including the underside of the leaves.
