Green peach aphids were observed in Kimberly this week. Aphids on potato are of concern only in regard to their transmission of plant viruses. Systemic insecticides are generally the most effective against aphids; however, use of insecticides may reduce, but will not eliminate spread of viruses. There are no well-established treatment thresholds for aphids in potato.
Consult the PNW Insect Management Handbook (http://pnwpest.org/pnw/insects) for registered products. Consult CIS 1165 (http://www.cals.uidaho.edu/edComm/detail.asp?IDnum=1535) by Nolte, Alvarez and Whitworth for more detailed recommendations on management of aphid vectors of potato virus, including insecticide recommendations.
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