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is when the lettuce is attacked at the base and a slimy, yellowish orange-brown rot forms, which can the kill the entire plant.A quick-spreading grey mould appears on lettuce leaves, which renders them inedible. If the fungus strikes at the base

roots are then susceptible to secondary rots. Sometimes the foliage turns yellow and plants might even die. Tunnelling maggots feast on the carrot flesh, causing the outsides to be marked with brown rings. This is often followed by rotting. Sow carrots

eventually turn brown and wither. If the problem isn't tackled, tomato yields are lower and the fungus can overwinter in the greenhouse and persist the following year. Tomato leaves develop yellow blotches, then turn brown and wither. The crop might also

to the tubers, which turn a reddish-brown and, if a secondary infection strikes, the crop turns slimy and rots.Potato leaves are marked by brown patches, causing them to curl up and wither. The infection then travels down to the tubers, turning them into a slimy