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Infection & ResponseDiagram

Case Study 1: Rose Black Spot

Part of Plant Diseases and Defenses · GCSE GCSE Biology revision

This diagram covers Case Study 1: Rose Black Spot within Plant Diseases and Defenses for GCSE Biology. Plant pathogens, defense mechanisms, disease identification, crop protection It is section 4 of 18 in this topic. Focus on the labels, the relationships between parts, and the explanation that turns the diagram into an exam-ready answer.

Topic position

Section 4 of 18

Practice

22 questions

Recall

21 flashcards

Case Study 1: Rose Black Spot

Painted scene of a rose plant showing the progression of black spot fungal disease: a healthy green leaf on the left, an infected leaf on the right covered in dark spots with yellow halos, a fallen yellow-brown dying leaf below, and fungal spores drifting through the air to demonstrate airborne spread.

Rose Black Spot Disease Process

  1. Spore landing: Fungal spores land on leaf surface
  2. Infection: Spores penetrate leaf and establish fungal growth
  3. Symptom development: Black/purple spots appear, leaves turn yellow
  4. Spread: More spores produced, spread to other leaves/plants
  5. Impact: Reduced photosynthesis, weakened plant, early leaf drop

Keep building this topic

Read this section alongside the surrounding pages in Plant Diseases and Defenses. That gives you the full topic sequence instead of a single isolated revision point.

Plant Pathogens and Disease TypesCase Study 2: Tobacco Mosaic Virus (TMV)The Silent Battle in Your GardenKey Facts: Plant Diseases

Practice Questions for Plant Diseases and Defenses

What type of pathogen causes rose black spot disease?

  • A. Fungus
  • B. Virus
  • C. Bacterium
  • D. Protist
1 markfoundation

Explain how rose black spot affects the growth of infected plants.

2 marksstandard

Quick Recall Flashcards

What is a plant pathogen?
A microorganism that causes disease in plants, such as fungi, bacteria, or viruses.
What is rose black spot?
A fungal disease that affects roses, causing black or purple spots on leaves, which turn yellow and drop off, reducing photosynthesis.

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Plant Pathogens and Disease Types

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Case Study 2: Tobacco Mosaic Virus (TMV)