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Turn over a leaf and you'll see 2mm long white flies. With a life cycle of just three weeks, whitefly breed very fast. Both adults and offspring are sap feeders and a severe attack will weaken a plant. They excrete the sticky excess, called honeydew

tiny areas of leaf tissue, causing dead, brown patches. As the leaf grows, these areas tear causing a multitude of small holes. On apples, they leave raised bumps and scabby patches.The uppermost leaves on plants have small, brown-ringed holes, while

Snails, like slugs, cause a great deal of damage to plants. They feed mostly at night, seeking shelter during the day from the drying effects of the sun. However, the snail's shell allows it to move more freely than a slug over dry areas

. Dahlia plantSticks or canesStringJune - August15 minutesJuly - SeptemberCheck dahlias each week; if they're starting to flop tie the main stem to a supporting cane or stick with garden string. Don't tie the string too loosely, but allow a little room

Summer is the ideal time to take leaf cuttings from your houseplants. A single leaf can produce many young plants, and this technique is particularly useful for foliage plants such as Begonia rex.Healthy begonia plantClean, sharp knife and cutting

garden pestsAphidsMealybugsWhiteflyScale insectsChoose plants to grow in full sunBrowse plants by soil type

to feed. After 2-3 weeks, the larvae pupate inside the leaves and emerge as adults. The damage is mostly cosmetic but where many leaves are affected, the plant may be weakened or die. Different species of leaf miner fly affect specific plants.A maze

The culprit is the flea beetle, which, like its namesake, jumps away when disturbed. The small, shiny, black, brown or blue beetles emerge in April and May, after winter hibernation, ready to start feeding. Eggs laid near host plants hatch in late

Find out how to combine annuals and perennials of varying heights in a 'wave' planting, in this practical video guide from Carol Klein.springMore planting advicePlant a bare-root rosePlant a shrubPlant a bare-root treePlant a fig tree

staging or a dry shed.AdamIf your dahlias are in a warm, sheltered spot in the border and you don't want to lift them, add a thick layer of mulch for extra insulation in winter.Caring for your dahliasVideo guide to taking dahlia cuttings, with Sarah Raven.Planting