Pea Aphid Outbreaks and Virus Epidemics on Peas in the US Pacific Northwest: Histories, Mysteries, and Challenges

Fig. 3. Map showing locations of pea aphid outbreaks and virus epidemics, 1917-2005, on peas and other legumes in western Oregon (no. 1), the Blue Mountain region of eastern Oregon and Washington (no. 2), southern Idaho (no. 3), and the Palouse region of eastern Washington (no. 4).



Image from Plant Health Progress article:
Pea Aphid Outbreaks and Virus Epidemics on Peas in the US Pacific Northwest: Histories, Mysteries, and Challenges