Fig. 1

Leaf and chip symptoms 3 and 7 weeks post infestation. The two potato varieties Atlantic and Waneta developed ZC symptoms in aerial tissues and potato tubers. As reported previously, Waneta plants developed modest symptoms between weeks 3–4 compared to Atlantic plants, which typically develop obvious symptoms during that time, whereas both varieties generally have prominent symptoms by week 7 [26, 27]. Atlantic typically experiences a rapid decline immediately after week 6, leading to death between weeks7–8, whereas the decline is slower in Waneta . Thus, the two photo dates show minimal differences between the Lso + plants of the two varieties at 3 wpi, concurrent with the onset of symptom development, and at 7 wpi, where both have prominent symptoms