Thrips are sap suckers about one sixteenth inch long, colored yellow, green or black with finely fringed wings that give them a fuzzy appearance. They seldom fly and are more likely to jump, like springtails. Thrips can attack any fairly soft leaves, causing mottling or streaking. They also attack flowers which then develop white spots.
Thrips are attracted to blue and sometimes yellow. Make sticky traps to catch them.
Specimen plants which need a warmer climate zone than you have do well in sheltered, south-facing walls. The wall acts as a solar collector, absorbing heat during the day and releasing it at night, creating a small zone that is warmer than the rest of the garden.