Potential breeding places can be eliminated by sprucing up your plants,
Deteriorating leaves and faded or dead blooms should be removed.
Dead leaves and debris should be picked off the surface of the soil.
Dust off any obstructions that can block the pores of the leaves. Some plants benefit from a damp sponge on the leaves.
In the case of sick and infested plants disinfect/steralise saucers and containers.
Give Plants What They Need
A rest may be all a plant needs if it been performing flowering miracles through summer
Provide the right conditions to suit the type of plant.
Do not over water or leave standing in water.
Provide the right sort of soil for the plant. Special composts are now pre-formulated for Orchids, Cactus, acid lovers, Bonsai etc.
Keep temperatures at a consistent and appropriate level.
Give plants adequate light and avoid sun scorching
If All Else Fails
Sick plants should be separated from healthy plants to avoid cross contamination
Always wash your hands and tools after handling a sick plant.
Develop a callous attitude to badly infested or diseased plants. Accept some failures and destroy them saving your time and energy for healthy specimens.