LEAF SPOTS, ANTHRACNOSE, AND SCAB OF PANSY AND VIOLET Pansies (Viola tri color, V. cornuta, and V. rafines quii) and sweet or florists’ violet (Viola odorata) are popular garden flowers that exhibit a wide range of colors, markings, and sizes. Cercospora pansy problems produce dark gray, raised spots with a feathery texture. These produce spores that allow the fungi to reproduce and spread throughout the garden and onto other plants. They seem to affect forest pansy trees that are planted where they receive too much sun. • Readily available at a pH of 5.9 or lower. Leaf blights that start with a half-circular brown spot at the edge of the leaf can develop into stem cankers. ©2020 University of Massachusetts Amherst • Site Policies, Greenhouse Best Management Practices (BMP) Manual, New England Greenhouse Floriculture Guide, Pesticide Information (Labels, MSDS, WPS), Pesticide Licensing (Certification, Exams, Workshops), Soil and Plant Nutrient Testing and Diagnostics, Center for Agriculture, Food, and the Environment, Center for Agriculture, Food and the Environment. It sounds as though they are suffering from a strain of fungal leaf spot. Common Diseased Pansy Symptoms Alternaria Leaf Spot – The first symptoms of alternaria leaf spot include tan or greenish-yellow lesions turning dark brown. Leaf spot diseases and powdery mildew are two of the fungal sources of white spots on pansy leaves. Eagle 20 EW at 6 to 12 fl oz/100 gal water. 12-hr reentry. Cercospora Leaf Spot Spots and blotches on the leaves of pansies are caused by the fungal pathogens Ramularia lactea, R. agrestis and Mycocentrospora acerina. Bonide Fung-onil Multi-purpose Fungicide at 2.25 teaspoons/gal water. Apply thiophanate methyl & chlorothalonil (Spectro 90 WDG), chlorothalonil (Daconil Weather Stik), triadimefon (Strike 50WDG) or Bacillus subtilis QST713 (Cease) according to label directions. Emblem at 2 to 4 fl oz/100 gal water. As the disease progresses, the center of the spots becomes dry and tan and may have a concentric ring pattern. Regular sprays with a foliar fungicide will control the disease. Using with oils or adjuvants may damage plant. Leaf Spots. Group 11 fungicide. • Deficiency results in a leaf cupping, leaf crinkling, tip abortion and edge burn. CCMG Help Desk Response: The spots on the leaf are most likely caused by a … Flower petals of infected plants may be spotted and develop abnormally. Insects, Diseases, and Other Plant Problems: Fungal leaf disease, pansy leaf spot and powdery mildew may affect this plant. Slugs, snails and glasshouse red spider mite are common insects. However, watering should be done early in the day to give the foliage a chance to dry before nighttime. Spots generally are on the lower foliage first. Xanthomonas leaf spot on Poinsettias Symptoms of Xanthomonas campestris pv poinsettiicola begin with dull gray water-soaked areas. Note Although Trinity TR is registered it is not recommended due to phytotoxicity issues. Other Leaf Spots: There are many fungi (Alternaria species, Cercospora species, Myrothecium species and Ramularia species) that can cause unsightly spots on pansy foliage. Remove infected plants and discard. One common variety in the U.S. is the eastern redbud (Cercis canadensis), thriving in U.S. Department of Agriculture plant hardiness zones 4b through 9a. 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May discolor blooms. Plant leaves and stem may become stunted and brittle. Limit the use of any one group during crop production. In the advanced stages, the leaf spots develop tan centers with purple borders. the leaf canopy to the root zone. produces small circular spots with tan centers, surrounded by a purple-red halo. Severe losses can occur on both seedlings and mature plants ready for sale. Spectro 90 WDG at 1 to 2 lb/100 gal water. Other fungi such as Alternaria sp. Black spots on pansy and viola leaves: Your precious pansies and violas seem to be doing well until one day you notice that the leaves are covered in tiny black spots. Chemical control If needed, use before symptoms are expected to develop. Viola x wittrockiana (Pansy) is a biennial or short-lived perennial, often grow as an annual. A charming addition to beds and borders, rock gardens or containers. In time, the leaf spots expand and girdle the leaf, causing it to die back from the tip. They appear after periods of hot weather followed by abundant rain. Pansy leaf spot. There are many different fungi that can cause this problem, which tends to occur during warm, wet weather, or where plants are watered from above the foliage. Optimum conditions for disease development include long periods of 90-100% relative humidity with nighttime leaf-wetting and daytime drying. 12-hr reentry. Prevention & Treatment:Combat anthracnose by digging up and destroying severely infe… It can severely weaken or kill affected plants. Palladium at 4 to 6 oz/100 gal water. are small spring-flowering trees, with numerous species and cultivars. Group M1 fungicide. 12-hr reentry. Dark concentric lines form within the spots. Group 1 + M3 fungicide. Leaves may have transparent tan, brown or black spots. Group 12 fungicide. Connect with UMass Extension Greenhouse Crops & Floriculture Program: UMass Research and Education Center Farms, Conservation Assessment Prioritization System (CAPS), Extension Risk Management/Crop Insurance Education, North American Aquatic Connectivity Collaborative, Civil Rights and Non-Discrimination Information. Drench adjacent plants with a fungicide. Do not use organosilicate additives. Heritage at 1 to 2 oz/100 gal water plus a non-silicone-based wetter sticker. Spirato GHN at 2 to 4 fl oz/100 gal water. Leaf spots are favored by warm, humid conditions especially later in the growing season during fall. Do not use a silicone-based surfactant. The fungus will begin as small, white spore spots on the tops or undersides of the pansy's leaves. The spots may range in size from 1/8 to 1/4 inch. Sunken brown to tan spots form on stems, girdle them and kill the plant. 12-hr reentry. Spore production may make tan necrotic centers of the spots look blackened. 1. Fungal leaf spot infections tend to develop in humid, moist conditions and the spores are easily spread by wind and splashes of water. Broadform at 4 to 8 fl oz/100 gal water. Cercospora Leaf Spot Zyban WSB at 24 oz/100 gal water. Fungal spores are spread by water splashed from overhead irrigation or rainfall. Leaf spot diseases and powdery mildew are two of the fungal sources of white spots on pansy leaves. It … The plants appear otherwise healthy and the spots themselves are difficult to see. Anthracnose: Anthracnose is caused by the fungus Colletotrichumspecies and causes a browning and blotching of the leaves. Chemical control of Cercospora leaf spot of pansy, 2002. The leaf was from a Redbud tree. A most popular bedding plant for cool weather, it boasts large, 2-4 in. Anthracnose: This is another very common leaf spot on pansies. Reference Hagan, A.K. Start with healthy transplants in a well drained soil, provide balanced nutrition, and avoid over-watering. 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