Bioology plant diseases

  • Created by: Jess4989
  • Created on: 27-04-18 11:39
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  • Plant diseases
    • Rose Black Spot
      • Symptoms
        • Large black or dark purple spots on the surface of the leaves or stems. As the problem gets worse the foliage gradually turns yellow and drops prematurely, weakening the plant.
      • Effects
        • extremely common and widespread fungal disease of both cultivated and wild rose varieties
      • plants it infects
        • Roses
      • How is it transmitted?
        • Spores are released under wet conditions and and usually spread by rain-splash
      • Prevention
        • 1. Surround plants with a fresh layer of mulch each spring                 2. fortnightly spraying regime to protect your plants                3. Choosing resistant varieties             4.raking around the plant with a *** and pruning and burning of infected material
    • Tobacco mosaic virus
      • Symptoms
        • Small patches, lighter than normal green, brown and yellow appear on the leaves. These are the earliest symptoms. Stunted growth.
      • Effects
        • Viral replication disrupts the plants, distracting it from its processe, such as photosynthesis, resulting in the yellowing of leaves.
      • How is it transmitted?
        • One of the viral protein widens the channels allowing the virus to spread to neighbouring plants, eventually accessing the plants Phloem and Xylem
      • Plants infected
        • Tomato and Tobbaco plants
      • Prevention
        • Remove infected plants,  washing plants in between planting and rotating crops
    • Bacterial diseases
      • Rare in plants
        • It helps with human research because you can test monoclonal antibodies
      • Symptoms and effects -leaf spots, stem blights, or cankers. vascular wilt, necrosis, soft rot, and tumours and
      • They are transmitted by bacterial pathogens enter plants through wounds,
      • It effects , potatoes, carrots and squash
      • You could prevent it by seed treatment with hot water at about 50° C
    • Aphids
      • Feed on the sap of plants and affect plant growth
      • However, heavy infestations will cause leaves to curl, wilt or yellow and stunted plant growth.
      • aphids attack the BYDV in the phloem
    • Chlorosis -magnesium deficiency- and iron deficiency can damage plants
      • Stunted growth because of nitrate deficiency
      • Magnesium deficiency causes leaf to turn yellow
      • To IDENTIFY plant diseases you could look in a gardening manual, research infected plants in the lab, or use testing kits with monoclonal antibodies


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