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with purple stripes.Pick off the adult beetles and larvae by hand and destroy.Spray with an insecticide - thiocloprid or imidacloprid - between late summer and spring. Avoid using insecticide when the plants are in flower as bees may also be killed

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, onto lower leaves where it en...

Sap-sucking aphids excrete honeydew, sometimes seen as a string or web of stickiness. This can drip down on to lower leaves and on to other plants. A dark or grey-green mould then spreads across the honeydew. It's unsightly and prevents light and air from reaching the leaves.Blac...