Exercise 3 solution

Example answer (yours will differ):
Carrots: carrot fly. Cover the crop with fine insect mesh from sowing, sow thinly so little thinning is needed (bruised leaves release the smell that attracts the fly), and thin or weed on a calm evening.
Cabbages: cabbage white caterpillars and pigeons. Cover with fine mesh or netting on a frame, and check under the leaves for yellow eggs, picking off any you find.
Peas: pigeons and mice. Net the rows, and protect the seedlings with a cloche or netting until they are established.
General habits for the whole plot:
1. Walk round once a week and look at both sides of the leaves, so problems are caught early.
2. Keep the plot tidy and rotate the crops each year, so pests and diseases do not build up. Encourage helpers such as ladybirds and frogs with a few flowers and a rough corner.