Fall Flying Aphids: Identification and Seasonal Behavior

Those Late-Season Swarms

If you're seeing gnat-like insects swarming in your yard during autumn, you're likely witnessing the winged generation of either green peach aphids or crapemyrtle aphids. This annual phenomenon catches many homeowners off guard.

Why They Appear in Fall

Throughout spring and summer, aphid populations consist entirely of wingless females reproducing asexually. As daylight decreases and temperatures drop in autumn, a generation of winged males and females emerges. Their sole purpose: mate and lay overwintering eggs on host plants.

Common Host Plants

• Green peach aphid: Peach, plum, and many vegetable crops
• Crapemyrtle aphid: Exclusively on crapemyrtles

Management Perspective

While these swarms can be annoying—especially when they land on you during outdoor activities—they're temporary. Cold weather naturally eliminates the winged adults. The overwintering eggs they lay will hatch next spring, continuing the cycle. No control measures are typically needed for these brief autumn flights.