**State what is meant by the term ‘plant disease’. Describe the damage caused by plant diseases to include:
- grey mould
- strawberry powdery mildew
- damping off
- honey fungus
- rose black spot
- potato blight**
**- club root
- hollyhock rust
- apple and pear canker
- fireblight
- bacteria canker on Prunus
- potato leaf curl virus (and vector peach potato aphid)
- tobacco mosaic virus**
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