Naturally occuring rosy apple aphid colonies were monitored periodically in 2002 and 2004 in unsprayed apple orchards in eastern West Virginia. Over 90 percent of the colonies were destroyed by predators prior apple bloom. The most abundant and effective predator was the multicolored Asian lady beetle. Random collections of rosy apple aphid colonies after apple bloom, when the colony rapidly expands in tightly rolled leaves, revealed that biological control was ineffective in controlling these later season colonies. Prior to the formation of tightly rolled leaves biological control, by adult Harmonia axyridis, is capable of controlling rosy apple aphid, but after the leaf rolls form biological control is ineffective.