A very widespread plant infection that affects a number of different plant species including tomatoes
Rose black spot
A fungal plant disease
Causes of rose black spot
1. Spread by water
2. Spread by wind
You will find plenty of questions on infectious plant diseases in the revision workbook
We can diagnose diseases in plants by looking for insects such as aphids, discoloration spots on leaves, stunted growth, decay or rot growths, and malformed stems or leaves
Identifying plant diseases
1. Use a garden manual or website
2. Take the infected plant to a lab to identify the pathogen
3. Use testing kits containing monoclonal antibodies
Plant ion deficiency diseases
Plant diseases not caused by pathogens
A lack of the nitrate ion causes stunted growth because nitrate is needed for protein synthesis and therefore growth
A lack of the magnesium ion causes chlorosis because magnesium is required to make chlorophyll, causing the leaves to lose their green coloration
