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Adults are extremely difficult to find. The only 'reliable' way you can find them is to find an infested dead tree (I usually find larvae/pupae on dead pines) in a period they will emerge (June probably the best time). You may encounter an adult on a trunk that way. Otherwise you must be extremely lucky to find one. My theory is that adults will spend most of there time in/near the canopy (with exception of the time that females are ovipositing). With aphids on young needles there will be honeydew available in the canopy that they can feed on. If you like a challenge: Go hunting in the tree tops. :p