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Leaves and sometimes stems are marked by dark blotches caused by a fungus. The spores overwinter on fallen leaves, stem lesions and bud scales, and reinfect the plant the next spring when there's a flush of new foliage. If these leaves are then infected, they too eventually turn ...

's not confirmed how the virus is spread, but sap-sucking insects, nematodes and gardening tools, such as pruning knives, are likely contenders.Canna leaves develop pale spots and streaks, as well as a distorted, crinkly look, while flowers may also become

When apple trees are in flower, the sawfly, Hoplocampa testudinea, lays its eggs in the developing fruit. In June, the larvae tunnel their way under the skin of the fruit and into the core, causing the apples to fall. When they're ready, they tunnel out of the apples, creating a ...

by hand any affected leaves and shoots. pearsspring to autumnMore advice on growing pearsTreating apple and pear scabPreventing pear wasp damageDealing with codling moth on fruit treesMonty's favourite fruit varieties

, pyracantha, sorbus all year roundMore common garden pestsAphidsWhiteflyLeaf miner flyEuonymus scale

. Space plants out to ensure good air circulation, and water early enough in the day to allow the leaves to dry out before nightfall. Also remove any garden debris that might harbour the fungus.lettucessummer to autumnMore common fungal problems

rot.Grow cultivars that have some blight resistance, such as 'Cara', 'Kondor', 'Valor' and 'Remarka'. Immediately destroy any leaves or stems showing the symptoms (never compost them), and any infected tubers. As a preventative measure, spray the crop

are your best allies. Ladybirds can be bought as a biological control, and you can also buy ladybird houses to encourage these helpful creatures to take up residence in your garden. They need time to tackle the problem, so don't expect them to hoover up

Tomato blight, a fungal infection called Phytophthora infestans, spreads by wind and water-splash. It also attacks potatoes, and is triggered by warm, wet conditions, making outdoor tomatoes more susceptible than those in a greenhouse. The crop is quickly ruined, and even if it's...

The fungus that causes this problem spreads rapidly in the warm, humid conditions of a greenhouse. It usually becomes apparent on the lowest tomato leaves from early or midsummer, which develop yellow blotches on the upper leaf surface. The leaves eventually turn brown and wither...