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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...

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