Mixed hedge diseases
I am new to gardening so any help would be greatly appreciated.
Earlier this year I planted a small mixed hedge consisting of 14 bare root whips. I treated the roots with Rootgrow Mycorrhizal Fungi and they have grown well over the year. However most types, if not all, are now diseased. These range from what looks like powdery mildew, yellow / brown spots on the leaves, leaves turning yellow and falling off and I think it’s the Bird Cherry whose leaves are brown, crispy and shrivelled up. I can provide photo’s if that helps.
The plants are:
Crab Apple (Malus sylvestris), Guelder Rose (Viburnam opulus), Bird Cherry (Prunus padus), Blackthorn (Prunus spinose), and Hawthorn (Crataegus monogyna)
Can anyone please give me advice as to why this has happened and what I can do about it?