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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

with copper fungicide every 10 days or so. They don't provide 100 per cent protection, but an attack will be slowed down and you should get a ripe crop.potatoes, tomatoessummer, autumn, winterMore advice on growing potatoesAdvice on earthing up potatoes

A notifiable bacterial disease of the rose family, although it may also affect apple and pear trees.

A general term for a number of fungal diseases, which are normally soil-borne, but also aerially transmitted. It affects a large range of plants, but commonly cereal cops. May cause damping off and blight, but can be controlled using fungicide.

Spread a thick layer of mulch (manure or compost) around fruit trees and bushesPlant fruit bushes, trees and canes into enriched soilPrune blackcurrants, cutting out a quarter of the oldest woody stems from mature plantsOrder blight-resistant seed

Joe Swift's video guide to growing tomatoes from seedMonty Don's advice on growing tomatoes in pots and grow bagsMethods for controlling tomato blightDealing with tomato leaf mouldProtect tomatoes from frost damageHow to grow tomatoes in a greenhouse

hot spells and provide shading. Promptly pick off any split tomatoes before they start to rot.tomatoessummer to autumnCommon problems affecting tomatoesTomato leaf mouldTomato blightTomato frost damageBlossom end rot

into the sunshine and rest them on bricks to ripenIdentify plants showing symptoms of potato blight, and immediately remove affected leaves and stemsOrder garlic bulbs and onion sets for autumn plantingPrune out fruited canes on summer-cropping raspberries

plants in our video from the Gardeners' World garden at Berryfields.courgettes, outdoor cucumbers, marrows, pumpkins, squashesearly summer Common problems affecting vegetable plantsPotato blightPea and bean weevilsCarrot root fly

Sun-loving tomatoes can suffer outdoors during spells of cold weather, with ideal temperatures from 18-24˚C and no lower than 13˚C. If it is too cold there might be poor pollination, curling of leaves and the fruits might be scarred, with holes