According to Raymond Cloyd, it is important to control ants, which are attracted to the fluid extracted by orchids, because ants protect aphids, soft scales, and mealybugs from attack by natural enemies. Another writer says that ants have never been proved guilty of damaging orchids, but sometimes ants live in cooperation with the mealy bug and may assist aphids. Ant-proofing outside the house is the safest and simplest method of dealing with them. Inside, you can use ant traps, use a tray of water to create a moat around the pot, weekly spray your plants with a floral safe insectcide. Apparently, especially if the ants have colonized the pot, the best thing to do is to repot the orchid. Dispose of the medium, and make certain that all the ant eggs and the queen are rinsed off the roots and pot. You may kill tons of worker ants without relief if the queen survives to lay eggs and replace them.