Insecticidal soaps are non-toxic and safe to use in backyards. Whenever using pesticides, be sure to read and follow the directions and heed the cautions found on the label. Aphids are attracted to yellow. Try placing a sticky yellow- color trap nearby to lure the aphids away from plants. Avoid the use of high-nitrogen fertilizers.
Aphids thrive when the nitrogen in the plant sap is high.
For more information on Aphids, see CSU Fact Sheet 5.511 . Photographs courtesy of Judy Sedbrook.