Orchids

Overview of pests, click on link for more detail
 Mealy Bug
Adult female mealybugs are small, sap-sucking soft-bodied insects that produce a white waxy body covering. The adult male has wings. .
 Soil Dwelling Larvae
These small black flies are about 2mm long. They are often seen running over the surface of pot plants where they mate and lay up to 150 eggs into the compost. Often known as Fungus Fly, Fungus Gnat or Sciarid fly.
 Vine Weevil

Vine weevil occurs both outdoors and under glass. Adults are dark in colour with pale spotting on their backs and are about 10mm in length with a distinctive pointed head. Watch out for plant collapse after Vine Weevil larvae have eaten the roots. 

 Flea & Leaf Beatles
A large number of beetle species can cause considerable damage, Flea beetles are becoming more common.