Update on the situation of the potato cyst nematodes Globodera rostochiensis and G. pallida in Portugal
In Portugal, Globodera rostochiensis (EPPO A2 List) was first reported in 1956 and is currently present in all potato producing regions, including Madeira and Azores islands. G. pallida (EPPO A2 List) was first found in Portugal in 1987. As part of the official control programme against potato cyst nematodes, surveys based on soil sampling (1500 mL/ha) were conducted from 2013 to 2019 in mainland Portugal; 748 soil samples were collected throughout the country. Potato cyst nematodes were identified in 168 samples, representing 22.5% of the tested samples. Of the positive samples, forty-eight tested positive for G. rostochiensis populations alone (28.6%), and 83 for G. pallida populations alone (49.4%), while mixed populations were found in 37 samples (22%). Both species are currently present in all potato producing regions of the country. The authors noted that the proportion of G. pallida has increased because of the use of potato varieties that are resistant to G. rostochiensis.
The situation of Globodera rostochiensis and G. pallida in Portugal can be described as: Present in all potato-growing regions, under official control.
Sources
Camacho MJ, de Andrade E, Mota M, Nobrega F, Vicente C, Rusinque L, Inácio ML (2020) Potato Cyst Nematodes: geographical distribution, phylogenetic relationships and integrated pest management outcomes in Portugal. Frontiers in Plant Science 11, 606178. https://doi.org/10.3389/fpls.2020.606178