Register with us or sign in 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