Leaves of these trees and shrubs should be protected with a fungicide application as they begin to grow in late March and April. Most effective are the systemic fungicides such as Propiconazole, Myclobutanil and Tebuconazole. Propiconazole is available in Fertilome Systemic Fungicide. Myclobutanil is in Spectracide Immunex Fungicide. Tebuconazole is in Bayer All-in-One Rose and Flower Care and Bayer Disease Control for Roses, Flowers and Shrubs. Propiconizole and Myclobutanil are applied as sprays to the leaves. The Bayer products are applied to the soil and taken up into the leaves from the roots. Systemic fungicides are translocated within the plant and stop disease development in already infected leaves as well as protecting new uninfected leaves. Daconil and Chlorothalonil are also widely available and effective, but are not systemic and therefore protect only new uninfected leaves. Organic gardeners can spray with lime-sulfur (calcium polysulfide), copper sulfate or Neem oil. In most cases you will have to look at the list of ingredients to find the technical, chemical names. We can apply any of these fungicides for you.