Update on the situation of Trioza erytreae in Portugal
In mainland Portugal, Trioza erytreae (Hemiptera: Triozidae – EPPO A2 List, vector of huanglongbing) was first found in the region of Porto in January 2015 (EPPO RS 2015/204) and progressively spread to Norte and Centro regions (RS 2017/167, RS 2018/212, RS 2020/072). At the end of September 2021, as result of the official monitoring, T. erytreae was detected for the first time in Algarve region, 115 km south of the closest location that was previously found to be infested, in orange (Citrus sinensis) trees on a pavement in the parish of Rogil (municipality of Aljezur). Further monitoring also detected the pest in other parishes of Aljezur and other municipalities of Algarve (Lagos, Monchique, Vila do Bispo), as well as further south in the Alentejo region (municipalities of Grândola, Odemira, Santiago do Cacem, Sines). A map of all demarcated areas is available on the DGAV website.
For all findings, a demarcated area was immediately established to include the parish where T. erytreae was detected with a buffer zone of 3 km radius beyond the borders of that parish. The measures in place include treatments, severe pruning, restrictions on the movement and production of hosts plants, except fruits, as well as biological control with Tamarixia dryi (Hymenoptera: Eulophidae). These measures are described in the national contingency plan (plano de Ação de controlo). Intensive monitoring is also performed in a surveillance zone of 10 km radius beyond the limits of the demarcated area.
The pest status of Trioza erytreae in Portugal is officially declared as: Present, only in some parts of the Member State concerned, under containment, in case eradication is impossible.
Sources
INTERNET
- DGAV website.https://www.dgav.pt/plantas/conteudo/sanidade-vegetal/inspecao-fitossanitaria/informacao-fitossanitaria/trioza-erytreae/
- DGAV (2021) Plano de Ação de Controlo Trioza erytreae (Setembro 2021). 36 pp. https://www.dgav.pt/wp-content/uploads/2021/10/DGAV_planoacao_triozaerytreae.pdf
NPPO of Portugal (2021-11).