GCSE Biology (AQA)

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Plant Diseases

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Infection and Response Plant Disease

Plant Diseases

1:52 Plant Disease Issues
Spec 4.3.3.1
Previous Plants versus Herbivores Next Detecting Plant Diseases
  • Plants can catch diseases from each other.
  • Communicable diseases in plants may include tobacco mosaic virus and black spot.
  • Tobacco mosaic virus is a viral disease causing a mosaic pattern of discoloration on leaves, impacting photosynthesis and growth.
  • Black spot is a fungal disease leading to purple or black spots on leaves, causing them to yellow and drop prematurely, reducing photosynthesis and growth.
  • Plant diseases can be caused by viral, bacterial, and fungal pathogens.
  • Insects like aphids can also infect plants, causing leaves to curl and discolor.
  • Aphid infestations reduce plant growth by sucking sap, leading to discolored and curled leaves.
  • Gardeners use ladybirds to control aphid populations, as ladybirds are natural predators of aphids.
  • Ladybirds help reduce aphid numbers, allowing plants to thrive and remain healthy.

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