1. Onion white rot

    Onion white rot

    (Sclerotium cepivorum) Onion white rot is a devastating fungal disease of onions, leeks and garlic and other plants in the allium family. It causes the plants to rot, making them unusable.
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  2. Lawn diseases

    Lawn diseases

    (Gaeumannomyces graminis, Laetisaria fuciformis, Monographella nivalis and other species) Lawn grasses are subject to a number of disease problems. Luckily, they rarely do very severe damage, but can lead to brown patches and areas of dead grass.
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  3. Honey fungus

    Honey fungus

    (Armillaria species) Honey fungus is a devastating disease of trees, shrubs and other woody, and some herbaceous, plants. It attacks and kills the roots, then rots the dead wood.
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  4. Fungal leaf spot diseases

    Fungal leaf spot diseases

    (Numerous fungal species – including Cercospora, Microsphaeropsis and Septoria) Fungal leaf spot diseases attack a very wide range of plants, producing spotting or marks, in numerous different shapes, sizes and colours, on the leaves.
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  5. Downy mildews

    Downy mildews

    (several fungus-like organisms) Downy mildew diseases attack many ornamental and edible plants, producing a range of different symptoms, including discoloured, shrivelled and brown leaves.
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  6. Damping off

    Damping off

    (Fusarium, Phytophthora, Pythium, Rhizoctonia) Damping off is a disease that affects seedlings, causing them to collapse, keel over and die. They may also become covered in a whitish, furry fungal growth.
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  7. Coral spot

    Coral spot

    (Nectria cinnabarina) Coral spot is a fungal disease that causes woody stems and branches to die back and produces tell-tale small, coral-pink/orangey raised pustules on affected growth.
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  8. Clubroot


    (Plasmodiophora brassicae) Clubroot causes swollen and distorted roots and stunted growth of brassicas – broccoli, Brussels sprouts, cabbage and cauliflower, including swede and turnip.
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  9. Clematis wilt

    Clematis wilt

    (Phoma clematidina – or physical damage) Clematis wilt disease causes clematis plants to wilt rapidly. However, most suspected cases of wilt are actually caused by physical damage to the stems.
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  10. Brown rot

    Brown rot

    (Monilinia laxa and M. fructigena) Brown rot is a fungal disease of fruit – especially apples, pears and plums – causing the fruit to rot. Shrivelled “mummified” fruit remain in the tree, spreading the disease.
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  11. Broad bean chocolate spot

    Broad bean chocolate spot

    (Botrytis fabae and Botrytis cinerea) Chocolate spot is the commonest fungal disease of broad beans. It produces reddish-brown or chocolate coloured spots on all parts of the plant.
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  12. Box blight

    Box blight

    (Cylindrocladium buxicola and Pseudonectria buxi) Box blight is a devastating fungal disease of box (Buxus) plants. It kills the leaves, resulting in extensive bare patches, and affected plants die back.
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