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The culprit is Trionymus diminutus, a 4mm sap-feeding mealybug that breeds relentlessly when the weather is warm and isn't killed by winter frosts. It deposits a white, waxy substance at the base of the sheathed phormium leaves. A mild infestation

(especially the miniaturised varieties) look ridiculous, but there are always exceptions. This is one: it has slender leaves with white undersides and cones to die for.Number four: Amelanchier canadensis. Some may consider this a shrub and they would be right

.Identifying bumblebeesThere are six bumblebees likely to visit gardens, all varying in colour, size and tongue length. Each species favours different nest locations, such as below ground, trees or long grass.Similar to the white-tailed bumblebee, but with mustard

The adult codling moths lay their eggs on or near developing fruit. These eggs hatch into small white caterpillars, which eat their way into the fruit and feed inside while it's developing. The caterpillars may be found inside the fruit at harvest

Soft-bodied, 4mm-long mealybugs are often found on greenhouse plants and house plants such as cacti and succulents, feeding on their sap. They are covered by a white, waxy secretion, and congregate in leaf axils and other inaccessible parts

White, waxy, sap-feeding aphids colonise cracks, crevices and pruning cuts on the bark of apple trees in the second half of spring. They then spread to new growth and create soft swellings. If the bulges split open in frosty weather, infections

Monty Don's advice on planting summer cabbagesCombatting cabbage white caterpillarsTackling LeatherjacketsBrowse a variety of vegetable plantsChoose plants by soil type

Also know as American gooseberry mildew, this greyish-white powdery growth of the fungal disease Sphaerotheca mors-uvae appears on new shoots, which can become distorted and die off. The mildew also affects the upper leaf surfaces and stems

Hedge bindweed, Calystegia sepium, is able to spread rapidly to creep between cultivated plants, making it difficult to eradicate. It's able to re-grow from small pieces of cream-white root, so cultivating a border often aids its spread. It can make

, and is offered in a range of colours. New for 2010 is the pure white 'Double Click Snow Puff', which has been approved as a new novelty variety by Fleuroselect (a European variety trial organisation looking for the best new bedding plants). Many cosmos come