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