Diseases, Pests, and Other Problems Articles A White Paper on Black Spot Part I – What is it? by Dave Ingram A White Paper on Black Spot Part II – What Can I Do About it? by Dave Ingram A White Paper on Black Spot Part III – “Poor David Brays About Sprays” by Dave Ingram Crown Gall Health in the Garden, Series I (Tetanus) Health in the Garden, Series II (Mosquitos) Murder by Roundup Oh, Hail, What to do now! Rose Insects: What are they and what are they doing? When Your Rose Changes Color Colorado State University Fact Sheets & Websites CSU Bioagricultural Sciences and Pest Management Japanese Beetle Information Diseases of Roses in Colorado Insect Control: Horticultural Oils Japanese Beetle Fact Sheet Dr. Whitney Cranshaw Leafcutter Bees Powdery Mildew Spider Mites Plant Talk Colorado Web Pages Aphids Powdery Mildew Rose Cane Borer Rose Diseases Rose Insects Viruses in Plants Additional Resources Baldo Villegas’ Bug Page Japanese Beetle Management in Colorado Click here to purchase our definitive guide to growing beautiful roses in Colorado. BECOME A MEMBER Click here to join the Denver Rose Society. Join our email list for information about upcoming events. SUBSCRIBE! You have Successfully Subscribed! NEED HELP? Click here for our list of Consulting Rosarians.