News Plants Yo, aphid, I’m red and I’m bad Aphids don’t fare as well on apple trees with leaves that turn red in the fall By Susan Milius April 14, 2009 at 6:55 pm - More than 2 years ago Share this:Share Share via email (Opens in new window) Email Share on Facebook (Opens in new window) Facebook Share on Reddit (Opens in new window) Reddit Share on X (Opens in new window) X Print (Opens in new window) Print Compare apples with apples, a researcher says, and red leaves on fall fruit trees look like they may be a warning to aphids. An orchard of apricot and apple trees in the village of Tamga in Kyrgyzstan flames red in fall.