Here in Kodiak, we have had the same aphid attack our Sitka Spruce trees last summer.  The land and waterways were absolutely covered with the pine needles that had fallen from the trees. Everyday I had to brush off my truck windows before driving and once a week, try to remove the tons of needles from the vent intake to my vehicles. In 32 years here in Kodiak, I have never witnessed anything like that.