Indoors this nasty pest can be present all year round, as temperatures and hours of daylight rise you may find bigger infestations and problems outdoors.

You can treat scale with nematodes, solution is sprayed on to the leaves of affected plants.  The nematodes 'swim' on the film of water allowing them to enter the scale insect and kill them. 

The temperature must be above 14°C for treatment to work and you must follow the steps below carefully but this provides a really great way of controlling scale.  You can red the full instructions for the nematodes HERE.