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Tiny sap-sucking scale insects. They are 1-6mm long, and their whitish, grey-brown shells are covered by protective, waxy scales. The insects don't cause too much damage unless they are present in huge numbers, but some excrete an unsightly, sticky

two years for your ball shape to fully develop.Find out how to create more topiary shapes, in Alan Titchmarsh's feature in the November 2011 issue of Gardeners' World Magazine, on sale now. Alan explains how to make a range of shapes, including cones

Find out how to identify the six species of bumblebee likely to visit gardens, by using our easy-to-follow guide.In recent years, bumblebeeshave suffered massive declines, leaving two of the UK's 27 native species extinct. Loss of habitat

. In severe cases, growth becomes distorted, leaves curl up, the plant weakens and can die.Natural predators, such as birds, earwigs, ladybirds, lacewings, hoverflies, ground beetles, spiders and parasitic wasps are a gardener's best allies. Some

and can be collected in the morning. Encourage natural predators, such as spiders and garden birds, especially starlings. Use the biological control Steinernema feltiae, which should be applied while the ground is still moist and warm in late

signs of diseases Apply a combined weed, feed and mosskiller to your lawnAround the gardenRemove suckers the stems of standard rosesTie tall border plants like delphiniums to their supportsFinish planting out dahlias, cannas and summer bedding

feedAlthough aphids suck plants sap, stunting growth, they are also a vital source of food for many beneficial insects and birds. Aphids love nettles, which you can grow as 'sacrificial' plants, saving valuable ornamentals. (The aphids might stunt

after flowering to promote new growth, which you can use over winter.May-OctoberMay-October30 minutesBay, Laurus nobilis x1Flat-leaf parsley, Petroselinum crispum x1French tarragon, Artemisia dracunculus x1Greek sage, Salvia officinalis 'Greek' x2Lemon