Case Study 1: Rose Black Spot

Part of Plant Diseases and Defenses · Section 4 of 18

DiagramUnit: Infection & ResponseGCSE
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

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.

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.

Previous

Plant Pathogens and Disease Types

Next

Case Study 2: Tobacco Mosaic Virus (TMV)

22 questions on Plant Diseases and Defenses: practise free

Instant marking, adaptive difficulty and spaced-repetition flashcards — all aligned to your exam board.

Start revising free →