Bonide Fung-onil Multi-purpose Fungicide at 2.25 teaspoons/gal water. Myclobutanil 20 EW T&O at 6 to 12 fl oz/100 gal water plus spreading agent. Cercospora leaf spot is the most common disease of pansy in the southeastern United States. Group 3 fungicide. (anthracnose) are also common leaf spot problems. Group 12 fungicide. Possible pansy diseases include fungal leaf spots, downy mildew, powdery mildew, rusts, gray mold, root and stem rot and viruses. … Many abiotic leaf spots are sent into the OSU Plant Clinic, which are difficult to distinguish from biotic leaf spots. Drench adjacent plants with a fungicide. How to Reduce Bee Poisoning from Pesticides, Alfalfa Leafcutting Bee (Megachile rotunda) Pests, Horticultural, Landscape, and Ornamental Crops, Field Characteristics of Fruit-Tree-Attacking Spider Mites in the Pacific Northwest, Pests of Cabbage and Mustard Grown for Seed, Pests of Rutabaga and Turnip Grown for Seed, Biology and Control of the Garden Symphylan, Bean, Dry Cultivar Resistance to Bean Common Mosaic, Grape (Vitis spp.) Infected seeds and weeds of the family Viola may be sources of inoculum. Low nutrition levels also can favor these leaf spots. A leaf spot is a limited, discoloured, diseased area of a leaf that is caused by fungal, bacterial or viral plant diseases, or by injuries from nematodes, insects, environmental factors, toxicity or herbicides.These discoloured spots or lesions often have a centre of necrosis or cell death. Anthracnose: Anthracnose is caused by the fungus Colletotrichumspecies and causes a browning and blotching of the leaves. Disarm 480 SC at 1 to 4 fl oz/100 gal water. Cercospora can be seedborne. OHP 6672 4.5 F at 7.5 to 20 fl oz/100 gal water. Fore 80 WP at 1.5 lb/100 gal water plus a spreader-sticker. Pageant at 8 to 12 oz/100 gal water. Using with oils or adjuvants may damage plant. Myrothecium Leaf Spot, flower blight, and crown rot caused by Myrothecium roridum is widely distributed and affects a wide range of hosts, causing leaf spots and sometimes stem cankers, particularly at the soil line. Group 12 fungicide. Sunken brown to tan spots form on stems, girdle them and kill the plant. Q. I am doing a report about pansies. Group 3 + 11 fungicide. Pansies also suffer from downy mildew caused by the fungus-like (Oomycete) organism Peronospora violae. Chemical control If needed, use before symptoms are expected to develop. The centers of the spots … Apply thiophanate methyl & chlorothalonil (Spectro 90 WDG), chlorothalonil (Daconil Weather Stik), triadimefon (Strike 50WDG) or Bacillus subtilis QST713 (Cease) according to label directions. Group 1 + M3 fungicide. They are grown exten-sively in nurseries in the winter and find a ready Cause Several fungal leaf spots have been reported from the Pacific Northwest including Ramularia agrestis, R. lactea, and Cercospora violae. The lower affected leaves may turn yellow and drop. 4-hr reentry. 24-hr reentry. The plants appear otherwise healthy and the spots themselves are difficult to see. Other fungi such as Alternaria sp. Redbuds (Cercis spp.) Dark concentric lines form within the spots. Group M5 fungicide. Flower petals of infected plants may be spotted and develop abnormally. Dead spots 1/8 to 1/4 inch with dark brown margins and gray centers form on leaves. Orkestra at 4 to 10 fl oz/100 gal water. Use preventively only. 24-hr reentry. Figure 1. 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