Red spots on dogwood leaves

(Question)

There are red spots all over dogwood leaves. What do I do?

 

(Answer)

Without more information  I suggest the likely cause of the red spots is a fungus such as Septoria leaf spot, common on  dogwoods.  To control Septoria leaf spot and other air-borne fungi, clean up and bag as far as possible the  infected  leaves, particularly those that have fallen  to the ground because the soil is where the fungus survives the winter.  The bags should be sent to the landfill and not put in a compost pile or put out for yard waste pickup  in order to prevent the spread of infection.  Mulching round the affected shrub this fall  will help to prevent water splash. Plant parts that are close to the ground are  susceptible to infection from fungal spores splashing up from the ground.