Home orchard enthusiasts growing mayhaws now have a readily available fungicide they can use for control of rust caused by Gymnosporanium clavipes. Mayhaw has been added to the new label for Spectracide Immunox Multi-purpose Fungicide containing the active ingredient myclobutanil. For control of rust, sprays should be applied beginning at the pink bud stage and reapplied every 7 to 10 days thereafter. However, no sprays should be applied within 14 days of harvest. Please consult the label for use rates and other pertinent information.
Donald M. Ferrin, Ph.D., Louisiana State University Agricultural Center, Baton Rouge, LA