![]() Check any stored tubers regularly for decay Use the tubers from blighted crops as soon as possible, and avoid storing them if at all possible. To prevent slug damage avoid leaving tubers in the soil after this time When the skin on tubers has hardened, after about two weeks, the tubers can be dug up. When infection levels reach about 25 percent of leaves affected or lesions appear on stems cut off the foliage (haulm), severing the stalks near soil level and raking up debris. Picking off leaves or leaflets when just a few are affected may slow down the progress of the disease very slightly, but will not eradicate the problem Gardeners are able to access forecasts of when blight will be active in their region, check if there have been previous instances of favourable weather for the disease, or see if there have been confirmed cases - visit the BlightSpy website, developed for professional growers but providing useful information for gardeners However, early cultivars are still genetically susceptible to the disease, so if weather conditions mean that the disease gets going early in the summer they could still be affected first-early cultivars) are more likely to escape infection, as levels of the disease tend to increase as summer progresses. Infected material should be deeply buried (below the depth of cultivation), consigned to the local council green waste collection or burned, rather than composted (see 'Biology' section, below)Įarthing up potatoes well provides some protection to the tubers from blight spores washed down into the soil from lesions on the leaves or stemsĮarly-harvested potatoes (e.g. Malvern Autumn Show - 22–24 September 2023.RHS Garden Wisley Flower Show - 5–10 September 2023.RHS Garden Rosemoor Flower Show - 18–20 August 2023.RHS Garden Hyde Hall Flower Show - 2–6 August 2023.RHS Flower Show Tatton Park - 19–23 July 2023.RHS Hampton Court Palace Garden Festival - 4–9 July 2023.Potato Late Blight video – Presentation about late blight and its management in potato by Steve Johnson, Extension Potato Specialist in Maine with years of experience with this disease.Steps For Managing Late Blight In Organically Produced Tomato And Potato.Late Blight: Recent Occurrences, Challenges, and Future Outlook (2013).Webinar on Recent Occurrences and Management Experiences (organic focus).Late Blight: Corrections of Misinformation.Steve Johnson, University of Maine Cooperative Extension.) All plant tissue above stem lesions will die shortly because the stem is completely affected, which is one reason that late blight is so devastating.īelow: tuber blight (Photos courtesy Dr. When first symptoms are mostly on stems (next two pictures below), it can be difficult to detect the onset of late blight, especially in a large planting as on a farm. Following two photographs were taken on LI in 2006. Symptoms also occur on other parts of potato plants including stems, petioles, and flowers. Leaf lesions can be small when they first start to develop (below left). Spores of the pathogen are visible on the lower (under) surface of leaves (below) Upper leaf surface with late blight lesions (below) The white growth on the leaf underside (see arrows, image below) contains hundreds of spores of the pathogen that could be dispersed by wind to other leaves in this field or beyond. ![]() These were the main symptom seen in a commercial field on LI in 2009 when this disease was first found. Large leaf spots (lesions) are common with late blight.
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