Exercise 2 solution

Example answer (yours will differ):
Suspicion: blight. Brown or black patches spreading after warm, wet weather are typical. Check the underside of the leaves for white fuzz.
Today:
- Cut off and remove the affected leaves and stems at once, to slow the spread.
- Keep the remaining tomato leaves dry: water at the base, not overhead.
- If potato foliage is badly hit, cut off the tops and lift the tubers a couple of weeks later, so that spores do not reach them.
- Inspect everything every few days while the weather stays damp.
Disposal: put the material in a bag and bin it (or follow local green-waste advice). Do not put it in a cool home compost heap, because the disease can survive and spread.
Next year: choose resistant varieties and rotate the potatoes and tomatoes to a new bed.