Honeysuckle Disease Canker Diseases. The stems may develop brown lesions. Links to this article are strongly encouraged, and this article may be republished without further permission if published as written and if credit is given to the author, Horticulture and Home Pest News, and Iowa State University Extension and Outreach. When sudden oak death is detected early, the honeysuckle may be saved by removing the damaged branches. Family Caprifoliaceae (Honeysuckle Family), University of California Agriculture & Natural Resources: Canker Diseases, University of California Agriculture & Natural Resources: Stem Cankers and Dieback, University of California Agriculture & Natural Resources: Powdery Mildew on Ornamentals, University of California Agriculture & Natural Resources: Sudden Oak Death, University of California Division of Agriculture and Natural Resources: Nursery Guide for Diseases Caused by Phytophthora Ramorum on Ornamentals: Diagnosis and Management, Missouri Botanical Garden: Lonicera Sempervirens, Missouri Botanical Garden: Lonicera Fragrantissima, Missouri Botanical Garden: Lonicera Periclymenum “Serotina”, Missouri Botanical Garden: Lonicera Involucrata, Hardy & Resistant Perennial Vine Climbers. Honeysuckle leaf blight is caused by the fungus Insolibasidium deformans. Plants grown at high densities develop dense foliage that reduces aeration and increases humidity, conditions that favor disease development. Place the stems in the garbage to prevent further spread of the disease. Honeysuckles are most severely affected by this disease when planted in a shady or partially shady location. Diaporthe stem canker, eutypa dieback, hypoxylon canker and phoma stem and leaf blight are common honeysuckle diseases in warm climates. The “Serotina” woodbine cultivar (Lonicera periclymenum “Serotina”) is another honeysuckle vine with good disease resistance. These diseases are usually treatable but disease-resistant honeysuckles should be used whenever possible. Pour the mixture into a clean hand-held spray bottle. The first symptom is a yellowing of leaf tissue. Honeysuckle leaf blight is caused by the fungus Insolibasidium deformans. Do this in the morning so the honeysuckle can dry before evening. are foliar hosts of this disease. Sooty Mold. It is also resistant to deer browsing. Treating With Neem Oil Combine 2 1/2 tablespoons of neem oil -- available at most garden centers -- with 1 gallon of water. Honeysuckle species are generally susceptible to the same diseases, although some are naturally resistant. Powdery mildew appears on the leaves as white powdery-looking spots or splotches. Sooty mold (Alternaria) is a deep black fungus that forms a dark coating on the surface … Honeysuckle vines can contract two common diseases, powdery mildew (800) 262-3804, Iowa State University | PoliciesState & National Extension Partners, by Teresa Cotten, Department of Plant Pathology, Like us at Plant and Insect Diagnostic Clinic, Like us at Department of Plant Pathology and Microbiology, Viburnum, Bacterial Leaf Spot/Leaf Blight, Venturia Leaf and Shoot Blight of Aspen and Poplars. It grows to a height of 8 to 15 feet and is hardy in USDA zones 4 to 9. The first symptom is a yellowing of leaf tissue. She recently became a licensed insurance agent but has decided to pursue a writing career instead. and rhododendrons (Rhododendron spp.) Caring for a Fuchsia Gartenmeister Bonstedt. Trumpet honeysuckle (Lonicera sempervirens), for example, is a deciduous vine that blooms in orange-red from spring to fall while winter honeysuckle (Lonicera fragrantissima) is an evergreen shrub in warm Mediterranean climates that blooms in white in late winter. The information contained within may not be the most current and accurate depending on when it is accessed. Spray the honeysuckle with preventive fungicide in early spring. Trumpet honeysuckle has good resistance to these diseases. Use sharp hand pruners to remove the infected stems. Rain and overhead watering facilitates the spread of these fungal diseases. may be a woody shrub or a vine and evergreen or deciduous, depending on the species. The disease may also be present at a garden center or nursery. This tissue becomes tan brown and finally necrotic and dry with brown areas involving an entire leaf or a large portion of it. Cankers will appear on the stems as sunken discolored areas. Is Honeyrose Honeysuckle a Deer-Resistant Perennial? The cankers may be moist or have tiny black growths that produce fungal spores. Some honeysuckles are susceptible to sudden oak death which is caused by a plant pathogen. Watering from below the honeysuckle branches will help reduce the likelihood of infection. University of California Agriculture & Natural Resources: Honeysuckle, California Honeysuckle -- Lonicera Spp. It is also resistant to deer browsing and will grow in clay soil. The leaves are often rolled and twisted and drop prematurely. Powdery mildew is a fungal disease that flourishes when temperatures are between 60 and 80 degrees Fahrenheit. Similar symptoms can be caused by excessive fertilizer, drought, root injuries and other physiological problems. Severe outbreaks on valuable plantings can be prevented by an occasional application of a copper fungicide, Fore or clorothalonil (Daconil 2787).