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Possible pansy diseases include fungal leaf spots, downy mildew, powdery mildew, rusts, gray mold, root and stem rot and viruses. Insignia SC at 3 to 6 fl oz/100 gal water. Viola odorata and Viola tricolor. 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Cercospora Leaf Spot … Gray leaf spot initially appears as spots on the leaves that are round or oval, tan in color, and have a dark brown border. When the leaves are wet or humidity is high, the leaf spots turn gray and fuzzy with profuse spore production. Disarm 480 SC at 1 to 4 fl oz/100 gal water. Chemical control If needed, use before symptoms are expected to develop. They appear after periods of hot weather followed by abundant rain. Myclobutanil 20 EW T&O at 6 to 12 fl oz/100 gal water plus spreading agent. Leaf Spots. One of the most common leaf spot diseases of both pansies and violets is caused by the fungus Centrosporafungus include b achelor ’s b ut ton or cor nflower, butterc up, Cante rbury bells, Chin ese for get- me-not, columbine, delphinium, lobelia, penstemon, petunia, and scabiosa. I have recently planted violas in tubs how ever they are suffering from pansy leaf spot I have read that it is a air Bourne disease and is normally already in the plants prior to the buying of them from the garden centre does any one have a cure other than throwing them away as they really look poorly. 12-hr reentry. Group 9 + 12 fungicide. As the fungus matures, it will spread to cover the entire leaf, leading to numerous health problems for the pansy. Can occur on various aged leaves. Group 1 + M5 fungicide. Spots are irregular in both size and shape and do not have a sharp, rounded outline. Not so with 'Delta Marina' pansy. Thiophanate-methyl-based products. • Not available as a chelate so it does not cling to soil particles (easily leached). Group M3 fungicides. Cause Several fungal leaf spots have been reported from the Pacific Northwest including Ramularia agrestis, R. lactea, and Cercospora violae. Dark concentric lines form within the spots. 12-hr reentry. Xanthomonas leaf spot on Poinsettias Symptoms of Xanthomonas campestris pv poinsettiicola begin with dull gray water-soaked areas. 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.) They seem to affect forest pansy trees that are planted where they receive too much sun. The forest pansy redbud attracts various foliage-feeding caterpillars, but the redhumped caterpillars (Schizura concinna) often cause the most unsightly damage. and Colletotrichum sp. The spots may range in size from 1/8 to 1/4 inch. Apply thiophanate methyl & chlorothalonil (Spectro 90 WDG), chlorothalonil (Daconil Weather Stik), triadimefon (Strike 50WDG) or Bacillus subtilis QST713 (Cease) according to label directions. Reduce humidity by using fans and ventilating the greenhouse after watering. This site is maintained by Center for Agriculture, Food and the Environment in the College of Natural Sciences. Native Area: Nursery hybrid USDA Growing Zones: Hardy in … Palladium at 4 to 6 oz/100 gal water. Sunken, elongated brown to tan lesions often develop on the petioles, peduncles, or stems of infected plants. Anthracnose is first seen as brown to tan spots appearing on the tip or edge of the leaf. May observe a PGR effect. 4-hr reentry. Plant leaves and stem may become stunted and brittle. 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. A black margin separates healthy tissue from infected tissue. Champ, Champion, Kocide, KOP-Hydroxide, Bayleton,Cygnus, Eagle, Fosphite, Heritage, Systhane, and Manzate 80 WP are registered for outdoor ornamentals and Colletotrichum diseases. Group 19 fungicide. Terraguard SC at 4 to 8 fl oz/100 gal water. Group 12 fungicide. Other fungi such as Alternaria sp. Group 7 + 11 fungicide. It … Other Leaf Spots: There are many fungi (Alternaria species, Cercospora species, Myrothecium species and Ramularia species) that can cause unsightly spots on pansy foliage. Pansy leaf spot. The sweet-scented flowers arise from clumps of oval, dark green leaves. Group 12 fungicide. Leaf Spots (fungi – Alternaria violae, Cercospora violae): Chlorotic spots on lower leaves, centers later turn brown.Usually on lower leaves first. Orkestra at 4 to 10 fl oz/100 gal water. Group M1 fungicide. Spots generally are on the lower foliage first. Using with oils or adjuvants may damage plant. Yellow or tan spots can develop across the leaf. 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