Charles,
Unfortunately I can now confirm that AP is present in the Mushroom Compost I have been trialling. I have sent images to Dow Chemicals and they have confirmed.
This was purchased from a well established business which has been trading in Top Soil etc for over 50 years. They tell me that they have never had any previous problems with AP !
Broad Beans and French Beans are now showing distinct symptoms.
All very disappointing.
