marigold blight disease

Some of the most common diseases found on flowers the home garden include powdery mildew, gray mold (Botrytis), and black spot. This article includes a list of important marigold pests and diseases. Also known as “gray mold,” this fungus infects a lot of herbaceous annuals and perennials. These areas are closely followed by the development of grey spores on dead plant tissue. A gray mass of spores develops on necrotic tissue during wet conditions. Botrytis has several species with the most common being Botrytis cinerea. It is found everywhere plants are grown and has a wide host range. You must have JavaScript enabled in your browser to utilize the functionality of this website. 12-hr reentry. Leaves and shoots with botrytis blight have brown lesions and masses of gray spores. Broadform at 4 to 8 fl oz/100 gal water. Group 3 fungicide. Flower petals are most susceptible at any stage of development. Measure and apply micronutrient solutions carefully. Group 12 fungicide. Apply fungicide registered for use on this crop. 12-hr reentry. Group 12 fungicide. 12-hr reentry. 48-hr reentry. Plant Disease 89:1252-1262. View our privacy policy. Group 2 fungicide. 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Small (2-5 mm) circular dead spots form on leaves and petioles. Emblem at 2 to 4 fl oz/100 gal water. Marigold - Alternaria Leaf Spot and Flower Blight Alternaria Leaf Spot and Flower Blight on African marigolds Sometimes the Alternaria species is specific to a particular crop; often Alternaria alternata is the pathogen involved; this species is common, has a wide host range, and can occur as a secondary invader of senescent or injured tissue. OHP 6672 4.5 F at 10 to 14.5 fl oz/100 gal water plus another fungicide. By entering your email, you consent to receive communications from Penn State Extension. Destroy infected plants. Use with oils or adjuvants may cause plant damage. 12-hr reentry. Entire petals or flowers may become diseased. Avoid overhead irrigation, which encourages fungal disease and weighs plants down. Group 12 fungicide. Fore 80 WP at 1.5 lb/100 gal water. Additionally, how you can control the pests, insects, and disease attacks with a complete plant protection guide. In nursery the infection results in damping-off and is aggravated by soil moisture. Botrytis blight is a fungal disease that often crops up after periods of abnormally damp weather. Use with oils or adjuvants may cause plant damage. See: Greenhouse Plants, Ornamental-Gray Mold. Do not use on French dwarf-double or signet-type marigold seedlings. Spots have purple margins. Flower petals become water soaked and brown and may show the gray sporulation of the fungus. Palladium at 4 to 6 oz/100 gal water. 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.) Cause Botrytis cinerea, a fungus that colonizes dead, dying, and wounded plant parts. Manganese should not be above 55 ppm, molybdenum above 24 ppm, or boron above 3 ppm. Marigold Diseases & its Control. Get notified when we have news, courses, or events of interest to you. 12-hr reentry. Reference Pande, S., Stevenson, P., Narayana Rao, J., Neupane, R.K., Chaudhary, R.N., Grzywacz, D., Bourai, V.A., and Krishna Kishore, G. 2005. Jay W. Pscheidt, 2013. Various species of Alternaria, Cercospora and Septoria are known to cause leaf spot or blight of marigold. We found that intercropping with marigold induced a significant (∗ P<0.05) reduction in tomato early blight caused by A. solani, by means of three different mechanisms. Marigold (Tagetes spp. Flower petals become water soaked and brown and may show the gray sporulation of the fungus. They are responsible for a great deal of damage and are characterized by wilting, scabs, moldy coatings, rusts, blotches and rotted tissue. 12-hr reentry. Gray masses of spores form on the infected tissue when wet. Affected marigolds develop large brown patches of dead or dying tissue. Chipco 26019 N/G at 1 to 2.5 lb/100 gal water. Pageant at 12 to 18 oz/100 gal water. 12-hr reentry.

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