Practical Investigation Methods
Visual Symptom Recognition
| Symptom Type | What to Look For | Likely Cause |
|---|---|---|
| Spots/Lesions | Black, brown, or colored circular patches | Fungal infections |
| Mosaic Patterns | Light and dark patches, mottling | Viral infections |
| Wilting | Drooping despite adequate water | Bacterial or fungal root disease |
| Yellowing (Chlorosis) | Loss of green color in leaves | Nutrient deficiency or pathogen |
| Stunted Growth | Smaller than normal plants | Viral infections or soil pathogens |
Field Study Protocol
- Site Selection: Choose representative area with affected plants
- Visual Survey: Examine plants systematically for symptoms
- Documentation: Photograph or sketch symptoms with scale
- Sample Collection: Collect diseased tissue for closer examination
- Data Recording: Note environmental conditions, plant species, severity
- Identification: Use field guides or keys to identify disease
- Follow-up: Monitor disease progression over time
This deep dive covers Field Studies and Disease Identification within Plant Diseases and Defenses for GCSE Biology. Plant pathogens, defense mechanisms, disease identification, crop protection It is section 10 of 18 in this topic. Use this deep dive to connect the idea to the wider topic before moving on to questions and flashcards.
Practice questions for Plant Diseases and Defenses
What type of pathogen causes rose black spot disease?
Explain how rose black spot affects the growth of infected plants.
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.