Water-based spray solutionsPlace a small plate with half a lemon with cloves inside and the odour will repel the midges from the room. A spray solution can be made from boiling eucalyptus leaves in water and sprayed directly on to the midges.
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In theory yes, they prefer darker colours - because their prey is dark in colour. They are least attracted to white and bright colours. That's the theory at least, most people I know say it doesn't make a jot of difference in practice but it certainly can't hurt to take extra precautions.
The tiny invasive insects have been causing problems for farmers. It repels a bug called a midge and works well saving broccoli and kale from the insect.